TECHNICAL MANUAL OPERATOR AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41 (V) 1 (NSN ),

Transcription

1 TECHNICAL MANUAL OPERATOR AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41 (V) 1 (NSN ), AN/TTC-41 (V) 2 (NSN ), AN/TTC-41 (V) 3 (NSN ), AND AN/TTC-41 (V) 4 (NSN ) HEADQUARTERS, DEPARTMENT OF THE ARMY JUNE 1978 This copy is a reprint which includes current pages from Changes 1 through 3.

2 WARNING RADIATION HAZARD STD-RW-2 Lightning arrestors used in the signal entrance boxes and switchboards contain radioactive materials. These arrestors are potentially hazardous when broken in large quantity. See qualified medical personnel if you are exposed to broken arrestors. For first aid instructions, see TB and AR Use extreme care in replacing these arrestors and follow safe procedures in their handling, storage, and disposal. Never place radioactive arrestors in your pocket. Use extreme care not to break radioactive arrestors while handling them. Refer to TB and AR for instructions on handling, storage, and disposal of radioactive material. WARNING DANGEROUS CHEMICALS ARE USED IN NICKEL-CADMIUM BATTERIES The electrolyte used in nickel-cadmium batteries contains potassium hydroxide (KOH), which is a caustic chemical agent. Serious and deep burns of body tissue will result if the electrolyte comes in contact with eyes or any part of the body. Use rubber gloves, rubber apron, and protective goggles when handling the electrolyte. If accidental contact with the electrolyte is made, use ONLY clan clear water and immediately (seconds count) flush contaminated areas. Continue flushing with large quantities of clean clear water for at least 15 minutes. Seek medical attention without delay. EXPLOSIVE GASES ARE GENERATED BY NICKEL-CADMIUM BATTERIES Hydrogen and oxygen gases are generated in explosive proportions while the nickel-cadmium batter is being charged. Charge the nickel-cadmium battery in a well-ventilated area to reduce concentrations of explosive gases. Turn off the battery charger before connecting or disconnecting the nickel-cadmium battery to prevent arcing. Do not use matches or an open flame in the charging area. Arcs, flames, or sparks in the charging area will ignite the gases and cause an explosion. The battery box cover must be removed and the battery case vent plug (if any) must be open when charging. DO NOT MIX SULPHURIC ACID AND KOH The electrolyte used in nickel-cadmium batteries reacts violently to the sulphuric acid in the more common leadacid types of battery. Do NOT add sulphuric acid electrolyte to the battery; the mixing of the acid and KOH electrolytes will cause a violent reaction which could result in the spattering of the mixture into the eyes and onto the skin. Every effort must be made to keep nickel-cadmium batteries as far away as possible from lead-acid batteries. Do not use the same tools and materials such as screwdrivers, wrenches, syringes, hydrometers and gloves for both types of batteries. Any trace of acid or acid fumes will permanently damage nickel-cadmium batteries on contact. WARNING HIGH VOLTAGE is used in the operation of this equipment. DEATH ON CONTACT may result if personnel fail to observe safety precautions. AU components in the system may have high voltage on exposed terminals. Before working inside equipment, set power switches to off and remove the power cable from the power source. Ground high voltage points before touching them. WARNING The fumes of trichloroethane cleaning compound are toxic. Provide thorough ventilation whenever used. Do not use near an open flame, or hot surface. Trichloroethane is not flammable, but avoid prolonged or repeated breathing of vapor. Heat converts the fumes to a highly toxic phosgene gas. The inhalation of which could result in serious injury or death. Prolonged or repeated skin contact with trichloroethane can cause skin inflammation. When necessary, use gloves, sleeves and aprons which the solvent cannot penetrate.

3 C8 Change HEADQUARTERS DEPARTMENT OF THE ARMY No. 8 Washington, DC, 15 May 1992 Operator s and Organizational Maintenance Manual CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) (EIC: HLM), AN/TTC-41 (V)2 (NSN ) (EIC: HLN), AN/TTC-41 (V)3 (NSN ) (EIC: HLL), AN/7C-41 (V)4 (NSN ) (EIC: HLT), and INSTALLATION KIT MK-1885 TTC-41 (V) (NSN ) (EIC: HLV) TM , dated 19 June 1978, is changed as follows: 1. Title of manual is changed as shown above. 2. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Remove pages Insert pages 4-3 through through and and File this change sheet in the front of the publication for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 January Other requests for this document will be referred to Commander, U.S. Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

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5 } TM C-7 CHANGE HEADQUARTERS DEPARTMENT OF THE ARMY No. 7 Washington, DC, 1 September 1990 TM ,19 June 1978, is changed as follows: OPERATOR AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) AND INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by vertical bar in the margin of the page. Added or revised illustration are indicated by a vertical bar adjacent to the identification-tag or by a pointing hand on the illustration page. Remove pages Insert pages 5-1 and and 5-2 B-3 thru B-7/(B-8 blank) B-3 thru B-8 2. File this change sheet in front of the publication for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 January Other requests for this document will be referred to Commander, U.S. Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

6 By Order of the Secretary of the Army: CARL E. VUONO General, United States Army Chief of Staff Official: THOMAS F. SIKORA Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form 12-51E (Block 6913) Operator and Unit maintenance requirements for TM

7 C6 Change HEADQUARTERS DEPARTMENT OF THE ARMY No. 6 Washington, DC, 1 April 1990 Operator s and Organizational Maintenance Manual CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) and INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) TM , 19 June 1978, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Remove pages Insert pages and and and and File this change sheet in the front of the publication for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 January Other requests for this document will be referred to Commander, U.S. Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

8 By Order of the Secretary of the Army: Official: CARL E. VUONO General, United States Army Chief of Staff WILLIAM J. MEEHAN II Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form operator and unit requirements for AN/TTC-41(V)1-4.

9 C5 Change HEADQUARTERS DEPARTMENT OF THE ARMY No. 5 Washington, DC, 15 July 1989 TM , 19 June 1978, is changed as follows: Operator s and Organizational Maintenance Manual CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) and INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a vertical bar adjacent to the identification number. Remove pages Insert pages i through 0-1 i through through through 4-4 None through None 4-5/(4-6 blank) 2. File this change sheet in the front of the publication for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 January Other requests for this document will be referred to Commander, U.S. Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

10 By Order of the Secretary of the Army: Official: CARL E. VUONO General, United States Army Chief of Staff WILLIAM J. MEEHAN II Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form operator and unit requirements for AN/TTC-41(V)1-4.

11 C4 Change HEADQUARTERS DEPARTMENT OF THE ARMY No. 4 Washington, DC, 15 July 1989 TM , 19 June 1978, is changed as follows: Operator s and Organizational Maintenance Manual CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) AND INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a vertical bar adjacent to the identification number. Remove pages Insert pages i and ii i and ii 1-1 thru thru and and thru 2-13/(2-14 blank) 2-5 thru 2-15/(2-16 blank) 3-1 thru thru 3-4 NONE 3-4.1/(3-4.2 blank) 3-5 and and thru thru thru thru and and thru thru 5-8 A-1 and A-2 A-1 and A-2 B-3 thru B-7/(B-8 blank) B-3 thru B-7/(B-8 blank) C-3/(C-4 blank) C-3/(C-4 blank) I-1 and I-2 I-I and File this change sheet in the front of the publication for reference purposes. Distribution authorized to the Department of Defense and DOD contractors only for official use or for administrative or operational purposes. This determination was made on 30 January Other requests for this document will be referred to Commander, U.S. Army Communications-Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-LM-LT, Fort Monmouth, New Jersey DESTRUCTION NOTICE - Destroy by any method that will prevent disclosure of the contents or reconstruction of the document.

12 By Order of the Secretary of the Army: Official: CARL E. VUONO General, United States Army Chief of Staff WILLIAM J. MEEHAN II Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form operator and unit requirements for AN/TTC-41(V)1-4.

13 C3 CHANGE HEADQUARTERS DEPARTMENT OF THE ARMY NO. 3 WASHINGTON, DC, 1 JANUARY 1987 } Operator s and Organizational Maintenance Manual CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) and INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) TM , 19 June 1978, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a vertical bar adjacent to the identification number. Remove Pages Insert Pages 1-1, 1-2, and through and and and 4-6 (4-5 blank)/ File this change sheet in front of the publication for reference purposes. This publication Is required for official use or for administrative or operational purposes only. Distribution Is limited to US Government Agencies. Other requests for this document must be referred to Commander, US Army Communications- Electronics Command and Fort Monmouth, ATTN: AMSEL-ME-P, Fort Monmouth, NJ

14 By Order of the Secretary of the Army: Official: JOHN A. WICKHAM, JR. General, United States Army Chief of Staff R. L. DILWORTH Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form 1Z-51 literature requirements for AN/TTC-41(V)1-4.

15 C2 CHANGE HEADQUARTERS DEPARTMENT OF THE ARMY No. 2 Washington, DC, 26 December 1985 OPERATOR S AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) AND INSTALLATION KIT MK-1885 /TTC-41(V) (NSN ) TM , 19 June 1978, is changed as follows: 1. Remove old pages and insert new pages as indicated below. New or changed material is indicated by a vertical bar in the margin of the page. Added or revised illustrations are indicated by a vertical bar adjacent to the identification number. Remove pages Insert pages None...A/(B blank) i and ii...i and ii iii and iii and through through and and through through 2-13/(2-14 blank) 3-17 through through through through and and 4-8 A-1 and A-2...A-1 and A-2 B-3 through B-6...B-3 through B-6 D-3 and D-4...D-3 and D4 2. File this change sheet in the front of the publication for reference purposes.

16 By Order of the Secretary of the Army: Official JOHN A. WICKHAM JR. General, United States Army Chief of Staff MILDRED E. HEDBERG Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with DA Form literature requirements for AN/TTC-41(V)1-4.

17 } TM C1 CHANGE HEADQUARTERS DEPARTMENT OF THE ARMY No. 1 Washington, DC, 10 August 1981 TM , 19 June 1978, is changed as follows: 1. The title of the manual is changed as shown above. OPERATOR S AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ) AN/TTC-41(V)4 (NSN ) AND INSTALLATION KIT MK-1885 /TTC-41(V) (NSN ) 2. New or changed material is indicated by a vertical bar in the margin. 3. Adder or revised illustrations are indicated by a vertical bar next to the figure caption. 4. Remove and insert pages as follows: Remove pages Insert pages i and ii i, ii, and iii 1-1 through through through through and and through through 3-14 None through 5-8 D-3 through D D-3 through D-5/(D-6 blank) 5. File this change sheet in front of the publication for reference purposes. By Order of the Secretary of the Army: Official: EDWARD C. MEYER Chief of Staff General, United States Army ROBERT M. JOYCE Brigadier General, United States Army The Adjutant General DISTRIBUTION: To be distributed in accordance with Special List.

18 5 SAFETY STEPS TO FOLLOW IF SOMEONE IS THE VICTIM OF ELECTRICAL SHOCK 1 DO NOT TRY TO PULL OR GRAB THE INDIVIDUAL 2 IF POSSIBLE, TURN OFF THE ELECTRICAL POWER 3 IF YOU CANNOT TURN OFF THE ELECTRICAL POWER, PULL, PUSH, OR LIFT THE PERSON TO SAFETY USING A DRY WOODEN POLE OR A DRY ROPE OR SOME OTHER INSULATING MATERIAL 4 SEND FOR HELP AS SOON AS POSSIBLE 5 AFTER THE INJURED PERSON IS FREE OF CONTACT WITH THE SOURCE OF ELECTRICAL SHOCK, MOVE THE PERSON A SHORT DISTANCE AWAY AND IMMEDIATELY START ARTIFICIAL RESUSCITATION NOTE: DON T WAIT UNTIL AN ACCIDENT HAPPENS! READ ABOUT ARTIFICIAL RESPIRATION IN FM Change 2 A

19 WARNING RFI FILTERS CONTAINING PCB This equipment contains Radio Frequency interference (RFI) filters, NSN , which may contain a dielectric fluid with Polychlorinated Biphenyl s (PCB s). PCB s are toxic and may pose serious health and environmental hazards if misused or mishandled. Health hazards involve ingestion and prolonged or frequent skin contact. Environmental hazards involve contamination of soil and water. Use rubber gloves, rubber apron and eye protection when handling PCB fluid. In the event of eye contact, immediately flush the eyes with clean water and continue to flush for 10 minutes. Seek medical attention. Skin contact requires washing with soap and water. RFI filter part number SP-289, manufactured before 1 Jan 1975 (date code 7501) by FILTRON Mfg. Co., Inc., contains PCB dielectric fluid. RFI filters which have been painted over or otherwise have had identifying marks obliterated must be assumed to contain PCB dielectric fluid. RFI filters known to contain or suspected of containing PCB s, and the panels behind which they are located, must be labeled IAW environmental protection regulations contained in Title 40, Code of Federal Regulations, Part 761 (40 CFR 761). Warning Label A, below, identifies an RFI filter known to contain PCB s. Label B identifies a RFI filter suspected of containing PCB s. Leaking RFI filters known to contain or suspected of containing PCB s must be removed from service IAW 40 CFR 761, disposed through the Defense Property Disposal Office (DPDO) and replaced with non- PCB RFI filters. Contact your unit s environmental, safety, industrial hygiene or preventive medicine personnel if you observe a leaking RFI filter or if you need additional local assistance in this matter. Change 2 B

20 TECHNICAL MANUAL HEADQUARTERS DEPARTMENT OF THE ARMY No WASHINGTON, DC, 19 June 1978 OPERATOR AND ORGANIZATIONAL MAINTENANCE MANUAL CENTRAL OFFICE, TELEPHONE, AUTOMATIC AN/TTC-41(V)1 (NSN ) AN/TTC-41(V)2 (NSN ) AN/TTC-41(V)3 (NSN ), AND AN/TTC-41(V)4 (NSN S89) AND INSTALLATION KIT MK-1885/TTC-41(V) (NSN ) REPORTING ERRORS AND RECOMMENDING IMPROVEMENTS You can help improve this manual. If you find any mistakes or if you know of a way to improve the procedures, please let us know. Mail your letter, DA Form 2028 (Recommended Changes to Publications and Blank Forms), or DA Form located in back of this manual direct to: Commander, US Army Communications- Electronics Command and Fort Monmouth, ATTN: AMSEL-LC-ME-PS, Fort Monmouth, New Jersey In either case, a reply will be furnished direct to you. Paragraph Page CHAPTER 1. INTRODUCTION Section I. General II. Description and Data CHAPTER 2. SERVICE UPON RECEIPT AND INSTALLATION Section I. System planning and siting II. Service upon receipt III. Preparation for use CHAPTER 3. OPERATING INSTRUCTIONS Section I. Controls and indicators II. Operating under usual conditions III. Operating under unusual conditions CHAPTER 4. OPERATOR AND ORGANIZATIONAL MAINTENANCE Section I. General II. Operator/crew and organizational preventive maintenance checks and services (PMCS) and system readiness criteria III. Troubleshooting and maintenance CHAPTER 5. INSTALLATION KIT MK-1885/TTC-41(V) Section I. Introduction II. Service Upon Receipt and Installation III. Operating Instructions IV. Maintenance APPENDIX A. REFERENCES A-1 B. COMPONENTS OF END ITEM LIST B-1 Section I. Introduction B-1 II. Integral components of end item B-3 III. Basic issue items B-5 APPENDIX C. ADDITIONAL AUTHORIZATION LIST Section I. Introduction C-1 II. Additional authorization list C-3 Change 5 i

21 Paragraph Page APPENDIX D. MAINTENANCE ALLOCATION CHART Section I. Introduction... D-1 II. Maintenance allocation chart... D-3 III. Tool and test equipment requirements... D-4 IV. Remarks... D-5 APPENDIX E. EXPENDABLE SUPPLIES AND MATERIALS LIST Section I. Introduction... E-1 II. Expendable supplies and materials list... E-3 Index... Index-1 LIST OF ILLUSTRATIONS Figure Title Page 1-1 Central office, telephone, automatic AN/TTC-41(V)(0), rear and roadside, exterior view AN/TTC-41(V)(*), front and curbside, exterior view AN/TTC-41(V)(*), generator connection AN/TTC-41(V)(*), front wall, interior view AN/TTC-41(V)(*), roadside wall, interior view AN/TTC-41(V)(*), curbside wall, interior view AN/TTC-41(V)(*), rear wall, interior view Typical network arrangement Network equipment, TASS SYSCON Nodal equipment Power entrance box, exterior view, less cover CX-7453/U power cable (100 ft) CX-7705A/U power cable cable stub (15 ft) SB-3614(*)V)/TT rear panel cable connections Battery cable connections for BB-01/U Battery cable connections for BB SIGNAL ENTRANCE BOX, cover removed WAN/TTC-41(V)() signal distribution diagram Cable Connections, Switchboard SB-3614A(V)/TT for Nodal Terminal Operation (inside shelter) Cable Connections, Switchboard SB-3614A(V)/TT for Nodal Terminal Operation (outside shelter) Switchboard, telephone, SB-3614(*)V)/T Switchboard, telephone, SB3614A(V)/TT, front view Switchboard, telephone, SB-3614(*)(V)/T, rear view Power supply, PP-6224/U, controls and indicators Telephone set, TA-938/G, controls Telephone set, TA-312/PT, controls and connections Intercommunication station, LS-147F/FI, controls Electric heater, controls Air conditioner, controls Signal patch panel Power distribution box, controls and indicators Battery box, controls AC terminal connectors for battery box blower motor Installation Kit MK-1885/TT-41(V), components Power Supply PP-2953(*)/G, controls and Indicators Terminal box in operate position Installation kit interconnection diagram LIST OF TABLES Number Title Page 1-1 Equipment Compatible with SB-3614(*)(V)/TT Telephone Switchboard SB-3614(*)(V)/TT Controls and Indicators (Front) Telephone Switchboard SB-3614(*)(V)/TT Controls and Indicators (Rear) Power Supply PP6224/U, Controls and Indicators Telephone TA-938/G, Controls and Indicators Telephone Set TA-312/PT, Controls and Indicators Intercommunication Station, LS 147F/FI, Controls and Indicators Electric Heater, Controls Air Conditioner, Controls Patch Panel Jack Fields Power Distribution Box, Controls and Indicators Battery Box Controls Change 4 ii

22 Number Title Page 3-12 Power Box Connectors Preventive Maintenance Checks and Services System Readiness Criteria Deleted 4-4 Troubleshooting the AN/TTC-41()(*) Installation Kit MK-1885/TTC-41(V), components Power Supply PP-2953(*)/G, controls and indicators Change 5 iii

23 Figure 1-1. Central office, telephone, automatic AN/TTC-41(V) (*), rear and roadside exterior view. Change 2 0-1

24 CHAPTER 1 INTRODUCTION Section I. GENERAL 1-1. Scope a. This manual describes Central Office, Telephone, Automatic AN/TTC-41(V)1, AN/TTC-41(V)2, AN/TTC-41(V)3, and AN/TTC-41(V)4. It contains information required for installation, operation and maintenance of the equipment. Chapter 5 of this manual covers Installation Kit MK-1885/TTC-41(V) Organizational maintenance repair parts and special tools are listed in TM P. b. Central Office, Telephone, Automatic AN/TTC-41(V)5, AN/TTC-41(V)6, and AN/TTC-41(V)7, which are the trailermounted version of the equipment, are covered in TM c. Switchboard Telephone SB-3614(V)TT (NSN ) is referenced throughout this manual. Switchboard Telephone SB-3614A(V)TT (NSN ) is required when used with a terminal control device (TCD). The nomenclature SB-3614(*)(V)/TT, asterisk inserted, refers to all models of this switchboard in this manual Consolidated Index of Army Publications and Blank Forms Refer to the latest issue of DA Pam to determine whether there are new editions, changes, or additional publications pertaining to this equipment Maintenance Forms, Records, and Reports a. Reports of Maintenance and Unsatisfactory Equipment. Department of Army forms and procedures used for equipment maintenance will be those prescribed by DA Pam , as contained in Maintenance Management Update. b. Reporting of Item and Packaging Discrepancies. Fill out and forward SF 364 (Report of Discrepancy (ROD)) as prescribed in AR /DLAR /SECNAVINST /AFR /MCO J. c. Transportation Discrepancy Report (TDR) (SF 361). Fill out and forward Transportation Discrepancy Report (TDR) (SF 361) as prescribed in AR 55-38/NAVSUPINST C/AFR 75-18/MCO P D/DLAR Destruction of Army Electronics Materiel Destruction of Army electronics materiel to prevent enemy use shall be in accordance with TM Administrative Storage Prepare the assemblage for Administrative Storage for a period of 90 days or more by performing, as a minimum, the following steps: a. Remove wet cell batteries from the battery box and turn them in to a storage battery maintenance facility. b. Remove dry cell batteries from the hand lantern, flashlights, clock and any other item using dry cells. c. Turn off all electrical switches in the assemblage. d. Place desiccant bags inside individual equipment enclosures to protect against moisture. e. Store and secure all loose items Reporting Equipment Improvement Recommendations (EIR) If your Automatic Telephone Central Office AN/TTC-41(V) needs improvement, let us know. Send us an EIR. You, the user, are the only one who can tell us what you don t like about your equipment. Let us know why you don t like the design or performance. Put it on an SF 368 (Product Quality Deficiency Report). Mail it to Commander, US Army E Communications-Electronics Command and Fort Monmouth, ATTN.: AMSEL-PA-MA-D, Fort Monmouth, New Jersey We ll send you a reply. Change 4 1-1

25 Section II. DESCRIPTION AND DATA 1-6. Purpose and Use a. Purpose. Automatic Telephone Central offices AN/TTC-41(V)1, AN/TTC-41(V)2, AN/TTC-41(V)3, and AN/TTC- 41(V)4 (fig. 1-1 and 1-2) are air or vehicular transportable assemblages and used to provide rapid automatic switching to tactical units in an area-type communications system. The nomenclature AN/TTC-41(V) followed by an asterisk (*) refers to all models. The AN/TTC-41(V)(*) provides cordless service to 2-wire common battery signaling (CBS) lines, 20 Hz ringdown (RD lines or trunks, common battery dial pulse or dual tone multifrequency (DTMF) lines, 4-wire tone signaling trunks, 4-wire DTMF confirmation, tone burst, and converter trunks, 4-wire single frequency (SF) signaling AUTOVON access, automatic tandem, five levels of precedence and preemption. The AN/TTC-41(V)1 provides 30 lines of service in a shelter configuration. The AN/TTC-41(V)2 provides 60 lines of service in a shelter configuration. The AN/TTC-41(V)3 provides 90 lines of service in a shelter configuration. The AN/TTC-41(V)4 provides 120 lines of service in a shelter configuration. b. Uses. The use of the AN/TTC-41(V)(*) is determined by the tactical situation. Should a tactical necessity arise, any AN/TTC-41 can be modified for 150 line service Description Figure 1-2. AN/TTC-41(V)(*), front and curbside exterior view. a. AN/TTC-41(V)(*). All components of the AN/TTC-41(V)(*) are housed in a Shelter, Electrical Equipment S-250/G. When the S-250/G Shelter is modified to house the AN/TTC-41(V)(*), its nomenclature is: Shelter, Electrical Equipment S- 561(V)1/TTC-41 or S-561(VV.)2/TTC-41. The shelter facility is fully insulated and weather- proofed, and can be transported by air or ground vehicle. Equipment is housed in racks which are secured to the floor, ceiling and walls of the shelter. Mounting and storage is provided for spare parts and accessories. b. Switchboards (1) The Telephone Switchboard SB-3614/TT is a tactical, 30-terminal automatic switchboard. It provides service for 2-wire common battery signaling (CBS) lines, 20 Hz ringdown (RD) lines or trunks, common battery dial pulse, or dual tone multifrequency (DTMF) lines, and 4-wire tone signaling trunks. The basic switchboard may be operated as a 30-terminal single switchboard or may be connected with additional switchboards to form systems in multiples of 30 lines. Change 4 1-2

26 (2) The switchboard SB-3614A(V)/TT is a tactical, ruggedized, 30-terminal automatic switchboard. It provides rapid cordless service to various interfaces. The basic switchboard may be operated as a 30-terminal single switchboard or may be connected with additional switchboards to form a 60 or 90 line system. The operator monitors, answers, initiates, extends, preempts, and releases calls through actuation of a four-by-four pushbutton keysender and other functional pushbuttons. Any connection can be broken down manually, through operator intervention and action, or automatically, by a subscriber going on hook. (3) A switchboard may be removed from the AN/TTC-41(V)(*) and used with Installation Kit, MK-1885/TTC- 41(V) in a semi-permanent installation. The use of a SB-3614(*)(V)/TT with the MK-1885/TTC-41(V) is covered in more detail in Chapter 5. c. Power Supply. A PP-6224/U power supply provides direct current (dc) to the switchboard (s) and to maintain an emergency standby storage battery in a charged condition. d. Storage Battery. Two types of storage battery may be used in the system. The BB-501/U is a nickel-cadmium battery and is better suited for arctic climates than the other type. Lead-acid batteries, BB-297/U, may be used in temperate zones. Under no conditions may these two types be used together. The battery is enclosed in a blower vented box. It is kept in a charged state by a power supply for emergency use. The battery allows the switchboard facility and emergency lights to operate if the alternating current (ac) power source fails. e. Telephones. Two telephones are used in the AN/TTC-41(V)(*). (1) TA-938/G. The TA-938/G is a tone-dial, desk style push-button telephone with adjustable volume. (2) TA-312/PT. The TA-312/PT is a battery operated field telephone with a handcrank for generating a ringdown signal. f. Intercommunication Station. The intercommunication station, LS-147F/FI, is a solid state intercom used for communicating between facilities. g. Electrical Heater. Shelter heat is provided by either one or two thermostatically controlled portable electric heaters. h. POWER DISTRIBUTION BOX. The POWER DISTRIBUTION BOX is an ac load center distribution box. It contains a main circuit breaker, a voltmeter and an ammeter. In addition, it contains a circuit breaker/switch and an indicator lamp for each of the units requiring ac power. i. Air Conditioner. The vertical compact air conditioner is mounted on the outside of the shelter facility and cools at the rate of 6,000 BTU Hr. It can also be used as a heater. j. Patch Panel. A patch panel is installed in the system and links SIGNAL ENTRANCE BOX connections to the SB- 3614(*)(V)/TT. Since the patch panel is through-wired between the LINE and SWITCHBOARD sides, manual patching is not required during normal operations with the SB-3614(*)(V)/TT. The patch panel is used for maintenance tests, troubleshooting and emergency rerouting of circuits. k. Exhaust Blower. The exhaust blower, vented to the outside, provides air circulation in the shelter. I. SIGNAL ENTRANCE BOX. Three SIGNAL ENTRANCE BOXes on the outside of the shelter contain connector blocks to connect external signal cables to the switchboard facility. Binding posts are provided above the connector blocks for connecting individual field wires or cable pairs. The panels also contain lightning arrestor protection for each circuit. m. POWER ENTRANCE BOX. This box provides a means of connecting an outside ac power source to the shelter as shown in figure In addition, it has two ac outlet receptacles, a shelter ground connection and terminals for connecting two telephone lines and an intercom. n. Headset Switchbox. The switchbox is used by the operator to switch his headset from one switchboard stack to the other. It is used only if the facility uses four or five switchboards. o. Terminal Control Device. A terminal control device (TCD) may be used with the AN/TTC-41(V) to assist the operator in building and maintaining the telephone data base. The TCD will display the current data base and allow the operator to edit data bases in the SB-3614A/TT memory. The TCD will also display diagnostic information for maintenance and troubleshooting. The TCD is positioned on the folddown working surface during operations, and stored in its protective case in the AN/TTC-41 (V) storage drawer for movement. For operation, the TCD is connected to the SB- 3614A/TT I/O device port through the AN/TTC-41(V) patch panel. Change 4 1-3

27 p. SYSCON Device. A systems control SYSCON device may be used with AN/TTC-41(V) switchboards to assist the telephone network planner/controller to store data bases received from distant switchboards via dial-up phone lines. The SYSCON consists of a TCD, printer, and floppy diskette storage device (fig. 1-8). The SYSCON may be operated from any location where a compatible phone line is available Differences Between Models a. AN/TTC-41(V)1, AN/TTC-41(V)2, And AN/TTC-41(V)3 (fig. 1-3 through 1-6). The AN/TTC-41(V)1 is a 30 line system. The A/TTC-41(V)2 uses two switchboards as a 60 line system. The AN/TTC-41(V)3 uses three switchboards as a 90 line system. For AN/TTC-41(V)4, see para 1-8b. These systems, except for the number of switchboards, are assembled in a shelter in the same manner as follows: (1) Front Wall (fig. 1-3). The AN/TTC-41(V)1 has one switchboard positioned in the right-hand stack in the center position, SB-3614(*)(V)/TT No. 1. The AN/TTC-41(V)2 has an additional switch board installed in the right-hand stack in the bottom position SB-3614(*)(V)/TT No. 2. The AN/TTC-41(V)3 adds a third switchboard located in the righthand stack in the top position, SB-3614(*)(V)/TT No. 3. An operator s desk is attached to the rack at the lower switchboard level. At the top of the left-hand switchboard stack is a plexiglass board to be used as a communication plan routing board. Behind the routing board is a SPACE CARD BOX. TERMINAL BOX NO. 2 for dc power is attached to the wall behind the switchboard stacks. A BLOWER STORAGE plate is attached to the front wall at floor level. This plate is used only for storage of the exhaust blower assembly during transit. The exhaust blower and its cover box is mounted during normal operation on the outside wall, roadside. An electric heater is fastened on the floor below the left-hand switchboard stack. Figure AN/TTC-41(V)(*), Generator Connection. Change 4 1-4

28 Figure 1-3. AN/TTC-41(V)(*), front wall, interior view. (2) Roadside Wall (fig. 1-4). One POWER SUPPLY PP-6224/U and two STORAGE drawers are mounted in a rack just inside the door. Immediately above the rack is a two-door storage cabinet. A blower vented battery box capable of holding two batteries is mounted next to the power supply rack. Provision has been made to mount an electric heater on top of the battery box. An audible alarm is mounted in the power wiring duct, between the power supply rack and the battery box. The purpose of the alarm is to warn operating personnel that the exterior battery box vent door is not fully open. Two SIGNAL ENTRANCE BOXes are located near the front wall. Between the SIGNAL ENTRANCE BOXes are two DC CURRENT meters to monitor power supply or storage battery output. Above the meters is a switch mounted in the side of the power wiring duct marked DC LIGHTS-BATTERY 1 and BATTERY 2. Coat hooks and a rifle rack are mounted on the roadside wall. In addition to the wiring ducts, there are ac receptacles marked HEATER 1 and POWER SUPPLY. TERMINAL BOX NO. 1 is mounted on the wall above the battery box. A battery operated lantern and dust brush are mounted on the side of the storage cabinet. At floor level is a fire extinguisher, reel tiedown storage and transit storage for the operator s chair. (3) Curbside Wall (fig. 1-5). A SIGNAL ENTRANCE BOX is located near the front wall. Directly above are signal ducts. A patch panel is located next to the SIGNAL ENTRANCE BOX. Below the patch panel are SCREWDRIVERS, a CLOCK, a ROTARY FILE and a TA-938/G telephone set. Aft of the patch panel is a folding desk. Behind the folding desk is an LS-147F/FI intercom and a TA-312/PT telephone set. Above the folding desk is a PENCIL SHARPENER, PENCIL BOX and FIRST AID KIT, all mounted on a metal plate attached to the wall. Farther to the rear, above the folding desk, is the POWER DISTRIBUTION BOX. A wastebasket is stowed below the folding desk. Near the floor are brackets storing ground rods and an axe. Mounted in the power wiring ducts are ac outlet receptacles marked INTERCOM, CONVENIENCE and AIR COND. Change 4 1-5

29 Figure 1-4. AN/TTC-41(V)(*) roadside wall, interior view. Change 4 1-6

30 Figure 1-5. AN/TTC-41(V)(*), curbside wall, interior view. 1-7

31 (4) Rear Wall (fig. 1-6). The entry door is in the middle. Near the curbside wall is the air conditioner. Below is the POWER ENTRANCE BOX. On the roadside of the door are switches for INCANDESCENT COLD START LIGHTS, FLUORESCENT LIGHTS and BLACKOUT BYPASS. Figure 1-6. AN/TTC-41(V*), rear wall interior view. (5) Ceiling. Attached to the ceiling are five fluorescent, two incandescent and one dc emergency lighting fixtures. Spare fluorescent lamps are mounted outboard of the forward roadside and curbside fixtures. Spare fluorescent starters are mount on the forward roadside ceiling raceway. Above the door is a POWER INDICATOR lamp which is illuminated whenever an external ac power is applied to the assemblage. On the forward ceiling raceway is a switched receptacle marked BLOWER. (6) Floor. During transit, the cable reel and boarding ladder are secured to the floor. b. AN/TTC-41(V)4. This system is a 120 line facility using four switchboards. The layout is the same as the AN/TTC-41(V)1, 2 and 3 with the following exceptions: (1) Front Wall. Four SB-3614(*)(V)/TT are installed with three located in the right-hand stack and one located in the left-hand stack in the center position, SB- 3614(*)(V)/TT No. 4. A Headset Switch Box is used on the operator s desk to switch the headset from one switchboard stack to the other. (2) Roadside Wall. The AN/TTC-41(V)4 requires two PP-6224/U power supplies and two 24 volt storage batteries System Application (fig. 1-7 and table 1-1) Central Office, Automatic Telephone AN/TTC-41(V)(*) can be used to provide dependable telephone service to operating elements in the field. Through the line and trunking capabilities of the Change 4 1-8

32 SB-3614(*)(V)/TT, a mixture of several facilities may be interconnected to form a transportable communications network. Refer to figure 1-7 which shows a typical network arrangement. Refer to table 1-1 for a listing of equipment which may be used with the SB-3614(*)(V)/TTC-41(V)(*). AUTOVON Exchange Commercial Central Office Telephone TA-312/PT Telephone TA-236 Telephone TA-838 Telephone TA-938/G Switchboard SB-22 Switchboard SB-86 Figure 1-7. Typical network arrangement. Table 1-1. Equipment Compatible with SB-3614(*) (V)/TTC-41(V)(*). Equipment Switchboard SB-86 Switchboard SB-3082(V)GT Switchboard AN/TTC-25 Switchboard AN/TTC-30 Automatic Central Office AN/TTC-38 Central Office, Telephone AN/TTC-39 Central Office, Telephone AN/TTC-42 Switchboard Automatic SB-3865 Converter, Telephone Signal CV-1918A/G Converter, Telephone Signal CV-1919A/G Converter, Telephone Signal CV-1548(*)G Converter, Telegraph Telephone TA-182/U Terminal Control Device (TCD) * GRID Model 1129 (C-11767/TTC-41(V)) Function AUTOVON access line DC closure trunk Subset, Common battery signaling or ring-down mode. Subset, common battery, dial mode. Subset, common battery, dual tone. multifrequency (2-wire). Subset, common battery, dual tone multifrequency Ring-down trunk Ring-down trunk Ring-down or 4-wire tone signaling trunk 4-wire tone signaling trunk 4-wire tone signaling trunk 4-wire tone signaling trunk 4-wire tone signaling 4-wire tone signaling DTMF confirmation trunk 4-wire tone signaling trunk 4-wire tone signaling trunk 2-wire ring-down trunk Ring-down or 4-wire tone signaling trunk For use in AN/TTC-41(*) as I/O device Software and printer are located at division control (2 per division) Tabulated Data a. Input Voltage VAC, 60 HZ, Single Phase b. Power Consumption AN/TTC-41(V) Kilowatts (kw) AN/TTC-41(V)1 AN/TTC-41(V) kw AN/TTC-41(V) kw AN/TTC-41(V) kw Fluorescent Lights (5) Watts Incandescent Lights (6) Watts Change 4 1-9

33 Power Distribution Box...4 Watts Exhaust Blower Watts Battery Exhaust Blower...10 Watts Heater, Electric (2) Watts Air Conditioner Watts LS-147F/FI...20 Watts PP-6224/U Watts SB-3614/TT Watts SB-3614A(V)/TT Watts c. Temperature Ranges Operating F(-32 C) to +130 F (54 C)(with sun loading) Storage F (-54 C) to F (+74 C) Transit F (-54 C) to F (+74 C) Installation Kit MK-1885/TTC-41(V). Switchboard SB-3614(*)(V)/TT can be removed from the shelter and operated in a semi-permanent installation by using Installation Kit MK-1885/TTC-41(V) which must be requisitioned separately. NOTE Instructions for connecting SB- 3614A(V)/TT to a Terminal Control Device (TCD) are provided in para d. Weight AN/TTC-41(V) pounds AN/TTC-41(V) pound AN/TTC-41(V) pounds AN/TTC-41(V) pounds KEYBOARD/DISPLAY (TCD) STORAGE DEVICE PRINTER Figure 1-8. Network Equipment, TASS SYSCON. EL0XA29 Figure 1-9. Nodal Equipment. Change

34 CHAPTER 2 SERVICE UPON RECEIPT AND INSTALLATION Section I. SYSTEM PLANNING AND SITING 2-1. General Telephone system planners determine the central office locations and types of terminal line connections. Follow the instruction in this chapter to implement system plans System Layout Factors Select a location for the AN/TTC-41(V)(*) which satisfies the following distances: 115 VAC 60 HZ, single phase power. 100 ft (Max) SB-3614(*)(V)/TT to distant SB-3614(*)(V)/TT (w/o repeaters)...6 cable lengths Telephone sets, TA-312/PT to 22 miles 2-3. General The best operating site for the system is determined by the tactical situation, local terrain and weather conditions. a. Ground Installation. When installed on the ground, the shelter assemblage should be placed on a firm, dry surface with good drainage; the site should be prepared and leveled. The assemblage should be placed on concrete blocks or wooden beams, if possible, and positioned to facilitate connections of power and signal cables. If a generator set is used to provide power, it should be located approximately 75 feet away from the assemblage to minimize fire hazard and generator noise interference. b. Vehicular Installation. To install the shelter assemblage on a truck, refer to paragraph 2-4. For operator comfort and ease of maintenance, the truck should be leveled. Section II. SERVICE UPON RECEIPT 2-4. Loading Instructions a. Lifting. (1) When lifting the shelter (with a crane or helicopter), be sure to use a multiple leg sling, SM-D (2) Be sure that the sling assembly cables are connected to the lifting eyes with the turnbuckle ends of the cables next to the lifting eyes of the shelter before lifting. (3) Slowly lift the shelter with the crane or helicopter. Do not jerk the shelter when lifting. (4) Avoid swinging the shelter from side to side. The additional stress placed on the lifting eye assemblies should be minimized. (5) Do not bounce or jar the shelter. Bouncing or jarring can loosen the bond between the skin and foam-core and reduce the rigidity and strength of the shelter. (6) Do not attempt to butt shelters into place with a forklift. The lightweight shelters are not structurally designed for this mode of handling. If the shelter is crated, pallet-mounted, or has forklift instructions stenciled on the exterior, a forklift may be used to move the shelter. CAUTION If an uncrated shelter is not palletmounted and does not have forklift instructions stenciled on the exterior, DO NOT USE A FORKLIFT TO MOVE THE SHELTER: SLING LIFT THE SHELTER INSTEAD. b. Loading and Securing. (1) The shelter is to be located and secured on a 1 1/4 ton truck. (2) Use the sling hooks (nearest turnbuckle) to connect the sling assembly to the lifting eyes of the assemblage. Connect the sling hooks at opposite ends of the cables to the lifting ring, and place the lifting ring over the lifting hook of the lifting device. (3) Tie a 1/2 inch rope (at least 15 feet long) at each rear towing eye. (4) Lower the tailgate of the truck; make sure that all tools and equipment have been removed from the bed of the truck. Slowly lift the assemblage high enough to clear the body of the truck. NOTE The entrance door of the assemblage must be at the rear of the truck, and Change 4 2-1

35 the front end of the assemblage must be placed flush against the front of the truck body. WARNING All personnel must remain clear of the truck while the assemblage is being lowered onto the truck. (5) Position a man at the free end of each of the 1/2 -inch ropes to guide the assemblage. Back the truck slowly into position under the assemblage, and slowly lower the assemblage onto the truck. (6) Insert the appropriate size wooden skid blocks between the shelter skids and the sides of the truck bed to prevent sideway movement strain on the sling assembly cables. (7) Insert appropriately sized wooden blocks between the shelter skids and the cab wall of the truck bed to protect the towing eyes of the shelter and the cab wall of the truck bed. (8) Remove the lifting ring from the lifting hook, and disassemble the lifting ring and the sling hooks. Remove the sling hooks from the lifting eyes and the 1/2-inch ropes from the rear towing eyes. (9) Use two sling assemblies at each side of the assembly to secure the assemblage to the truck. (10) Tighten all turnbuckles evenly by hand. Then turn each turnbuckle an additional one half turn with a bar or rod inserted in the slot of the turnbuckle. (11) If the skin is punctured during loading operations, patch the punctures as soon as possible to prevent moisture seepage into the laminated panels of the shelter. Refer to TB , Maintenance and Repair Procedures for the S-250/G Type Shelter. (12) Raise and secure the tailgate Unloading Instructions a. Preparation. (1) Lower the tailgate. (2) If the skin is punctured during unloading operations, patch the puncture as soon as possible to prevent moisture seepage into the laminated panels of the shelter. Refer to TB , Maintenance and Repair Procedures for the S-250/G Type Shelter. (3) Loosen the turnbuckles on the sling assemblies used to secure the shelter to the truck. (4) Remove the wooden blocks from between the shelter skids and the cab wall of the truck bed. (5) Remove the wooden blocks from between the shelter skids and the sides of the truck bed. (6) Assemble the sling assemblies to the lifting ring. Turnbuckles should be closest to the free end. b. Unloading. (1) Connect the sling assembly cables to the lifting eyes with the turnbuckle ends of the cables next to the lifting eyes of the shelter. (2) Place the lifting ring over the lifting hook of the lifting device. (3) Tie a 1/2 -inch rope (at least 15 feet long) at each rear towing eye. WARNING All personnel must remain clear of the truck while the shelter is being lifted from the truck. (4) Position a man at the free end of each of the 1/2 -inch rope to guide the shelter. (5) Slowly lift the shelter high enough to clear the body of the truck. (6) Drive the truck out from underneath the shelter. (7) Slowly lower the shelter onto the ground or other prepared site. (8) Remove the lifting ring from the lifting hook, and disassemble the lifting ring and sling hooks. Remove the sling hooks from the lifting eyes and the ½ - inch ropes from the towing eyes. (9) Stow the sling hooks and lifting ring with the shelter so they will be available for the next lifting. Section III. PREPARATION FOR USE 2-6. Grounding and External Power Connections a. Grounding. The AN/TTC-41(V)(*) must be properly grounded before input power is connected. Select a grounding site (within six feet of the POWER ENTRANCE BOX) that is low and damp, and that will not interfere with the entrance door, power and signal cables. (1) Unlatch and lift the cover of the POWER ENTRANCE BOX. Use the cover support to secure the cover in the open position. (2) Remove a ground rod and the sledgehammer from their mountings inside the assemblage. (figs. 1-5 and 1-6). (3) Remove any grease or dirt from the ground rod. (4) Scoop out a small hole, about six inches deep, at the selected grounding site. (5) Drive the ground rod into the hole until the top of the ground rod is approximately three inches above the bottom of the hole. (6) Remove a 10-foot ground strap from the storage drawer in the assemblage. Connect one end of the ground strap to the ground rod, and the other end to 2-2

36 the GROUND TERMINAL stud in the POWER ENTRANCE BOX. See figure 2-1. (7) Saturate the ground around the rod with water to keep it moist. (8) If a generator set is used to supply ac power, ground it in the same manner as the assemblage. b. External Power Connections. Remove cables from the cable reel. The 100-foot cable (fig. 2-2) has connectors at each end. The 15-foot stub (fig. 2-3) has a connector at one end and unterminated wires at the other end. Both may be joined to form a 115-foot cable. Use the 15-foot stub when connecting to a generator set or any other power source without a connector. (1) Before connecting the power cable to the POWER ENTRANCE BOX, ensure that the 230V-115V selector switch on the PP-6224/U is set to 115V. Also, set the AC and DC switches to OFF. (2) At the POWER DISTRIBUTION BOX, set all circuit breakers in the OFF position. (3) Connect the power cable between the external 115 volt ac power source and the POWER ENTRANCE BOX on the connector marked IN-POWER 115 VAC. Refer to figures 2-1, 2-2, and 2-3. Figure 2-1. POWER ENTRANCE BOX, exterior view, less cover. Change 1 2-3

37 Figure 2-2. CX-7453A/U power cable (100 ft). Figure 2-3. CX-7705A/U power cable stub /(15 ft) Prepare Equipment For Use a. Prepare the AN/TTC-41(V)(*) for use by performing the procedures listed below. (1) If a generator set is used to supply power, start the generator; if a central power source is used, turn on the central power source. The POWER INDICATOR neon light will glow on the ceiling and the POWER DISTRIBUTION BOX (fig 1-5) VOLTS AC meter will indicate 115 volts ac ±11.5. (2) Place the POWER DISTRIBUTION BOX MAIN circuit breaker to ON. (3) Place the POWER DISTRIBUTION BOX circuit breaker marked LTG to ON; light indicator number 2 will illuminate. (4) If blackout conditions are required, place the BYPASS BLACKOUT (fig. 1-6) switch to BLACKOUT; otherwise leave it in the BYPASS position. (5) Operate the FLUORESCENT LIGHTS switch beside the door to operate the fluorescent ceiling lights. Change 1 2-4

38 NOTE If the temperature in the assemblage is too low, the fluorescent ceiling lights will not operate. Turn the INCANDESCENT COLD START LIGHTS (fig. 1-6) switch beside the door to ON to operate the incandescent ceiling lights. After the assemblage is heated enough, turn the fluorescent lights on and turn the incandescent lights off. (6) Unfasten and remove the operator s chairs from their stowed positions. (7) Unfasten and remove the ladder, wastebasket and rubber mat from their stowed positions. The rubber mat is used on the shelter floor. (8) Install the exhaust blower by following the steps below: (a) Remove the cover from the exhaust blower box stowed below the switchboard racks. Use a 7/16-inch wrench to remove the twelve bolts and washers. Retain the hardware. (b) Loosen the duct clamp on the inside of the box with a flat tip screwdriver, and disconnect the duct. (c) Remove the blower box from the wall plate by removing the four 1/4-inch nuts and then replace the hardware on the studs. (d) Remove the blower assembly from the wall by removing the four 5/16-inch nuts and washers, and then replace the hardware on the studs after the blower motor assembly has been removed. (e) On the outside front of the shelter, remove the eight 1/4-inch bolts and hardware from the air exhaust cover and retain the cover and hardware. (f) From the storage drawer, select four hex head machine screws, 5/6-18 x 1-inch. Pass the power cord of the blower through the exhaust hole into the shelter. With the blower exhaust facing downward, mount the blower with the 5/16-inch screws. (g) Twelve 1/4-20 screws are required to mount the blower box over the blower. Use eight screws removed in step (e) and select four more from the storage drawer. Mount the blower box on the mounting plate with the sliding door on the box facing downward. Slide the door open. (h) Reconnect the duct loosened in step (b). (i) Replace the cover removed in step (a) with the hardware retained in step (a). (j) Install the cover removed in step (e) to side of blower box with the 1/4-inch hardware provided on the side of the box installed in step (g). (k) Inside the shelter, plug the blower motor assembly power cord into the ceiling outlet marked BLOWER. (9) Install the required number of SB-3614 (*)(V)/TT switchboards in locations specified in paragraph 1-9. Refer to Figure 1-3. A 7/16-inch wrench or crescent wrench is required for installation. (a) Prepare switchboards for installation and make preliminary adjustments and set switches on rear panel in accordance with the wiring plan and numbering designations. (Refer to TM ). (b) Remove the front switchboard retaining brackets with a 7/16-inch wrench. (c) Loosen the top and bottom rack latches and swing the rack away from the wall. (d) Place the switchboard fully in the rack and place the top holddown retainer strap on top of the switchboard and fasten the retainer strap latch. (e) Install the front retaining brackets removed in step (b), and tighten. (f) Connect signal cables, dc power cables, switchboard interconnecting cables and ground straps to the rear panel. Refer to figure 2-4 which shows rear panel connections for an AN/TT-C-41(V)4. Make connections according to the number SB-3614 (*) (V)/TT to be used. The signal and power cables are marked as shown in the legend for figure 2-4. (g) Swing the rack back into place and secure with the top and bottom latches. Change 4 2-5

39 Figure 2-4. SB-3614(*)(V)/TT Rear Panel Cable Connections. Change 4 2-6

40 Index No. Cable Identification Cable Type From TO 1 SB-3614(*)(V)/TT UPPER TERMINAL SIGNAL PATCH PANEL UPPER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 1 & 2 SWBD SIDE SB-3614(*)(V)/TT 1 2 SB-3614(*)(V)/TT LOWER TERMINAL SIGNAL PATCH PANEL LOWER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 1 & 2 SWBD SIDE SB-3614(*) (V)/TT 1 3 SB-3614(*)(V)/TT UPPER TERMINAL SIGNAL PATCH PANEL UPPER EXTERNAL CONNECTION CONNECTION, SIG 3 & 4 SWBD SIDE SB-3614(*) (V) /TT 2 4 SB-3614(*)(V)/TT LOWER TERMINAL SIGNAL PATCH PANEL LOWER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 3 & 4 SWBD SIDE SB-3614 (*) (V) /TT 2 5 SB-3614(*)(V)/TT UPPER TERMINAL SIGNAL PATCH PANEL UPPER EXTERNAL CONNECTION CONNECTION SIG 5 & 6 SWBD SIDE SB-3614(*) (V)/TT 3 6 SB-3614(*)(V)/TT LOWER TERMINAL PATCH PANEL LOWER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 5 & 6 SWBD SIDE SB-3614(*) (V)/TT 3 7 SB-3614(*)(V)/TT UPPER TERMINAL SIGNAL PATCH PANEL UPPER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 7&8 SWBD SIDE SB-3614(*) (V)/TT 4 8 SB-3614(*) (V)/TT LOWER TERMINAL SIGNAL PATCH PANEL LOWER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 7 & 8 SWBD SIDE SB-3614(*) (V)/TT 4 9 SB-3614(*)(V)/TT UPPER TERMINAL SIGNAL PATCH PANEL UPPER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 9 & 10 SWBD SIDE SB-3614(*) (V) /TT 5 10 SB-3614(*)(V)/TT LOWER TERMINAL SIGNAL PATCH PANEL LOWER EXTERNAL TERMINAL CONNECTION CONNECTION SIG 9 & 10 SWBD SIDE SB-3614(*) (V) /TT 5 11 SWBD No. 1 DC POWER TB-No. 2 J-2 SWBD No SWBD No. 2 DC POWER TB-No. 2 J-2 SWBD No SWBD No. 3 DC POWER TB-No. 2 J-2 SWBD No SWBD No. 4 DC POWER TB-No. 2 J-2 SWBD No SWBD No. 5 DC POWER TB-No. 2 J-2 SWBD No NONE GROUND STRAP GROUND BUS GROUND TERMINAL SWBD No. 1 (BEHIND SWBD RACK) 17 NONE GROUND STRAP GROUND BUS GROUND TERMINAL SWBD No. 2 (BEHIND SWBD RACK) Change 4 2-7

41 Index No. Cable Identification Cable Type From TO 18 NONE GROUND STRAP GROUND BUS GROUND TERMINAL SWBD No. 3 (BEHIND SWBD RACK) 19 NONE GROUND STRAP GROUND BUS GROUND TERMINAL SWBD No. 4 (BEHIND SWBD RACK) 20 NONE GROUND STRAP GROUND BUS GROUND TERMINAL SWBD No. 5 (BEHIND SWBD RACK) 21 SWBD INTCON - SWBD INTER LOWER SWBD INTCON UPPER SWBD INTCON SWBD No. 2 CONNECT SWBD No SWBD INTCON SWBD INTER- UPPER SWBD LOWER SWBD INTCON SWBD No. 3 CONNECT INTCON SWBD No SWBD INTCON SWBD INTER- LOWER SWBD UPPER SWBD INTCON SWBD No. 5 CONNECT INTCON SWBD No

42 (10) Install the headset switch-box SC-D and interconnecting cable assemblies SC-D and SC-D (applies to AN/TTC- (V)4 only). The switch-box need be installed only if four or five SB-3614(*)(V)/TT are installed. With three or less SB-3614(*)(V)/TT, the operator s headset is plugged into the master switchboard SWBD NO. 1, center position in the right-hand stack. With four or five switchboards, the headset switchboard box is used to switch the operator s headset between the right-hand master SWBD NO. 1 and the left-hand master SWBD NO. 4. (b) Connect cables from the headset switch-box to the HEADSET jacks on SWBD NO. 1 and SWBD NO. 4. The connector receptacles on the headset switch-box are labeled, SWBD-R and SWBD-L. The right-hand cable is labeled HEAD-SET SWITCH- BOX RIGHT on one end and SWITCHBOARD RIGHT on the opposite end. The left-hand cable is marked similarly, but for the left side. (c) At the headset switch-box, connect the operator s headset cord to the HEADSET receptacle. (11) Install batteries in the battery box. The slide-out tray in the battery box will hold two BB-501 nickel-cadmium batteries. The tray will accept two BB- 297 lead-acid batteries. One battery of either type is used with one PP-6224 POWER SUPPLY in a 30, 60 or 90 line facility. Two batteries of the same type and two power supplies are used with a 120 line facility. CAUTION Nickel-cadmium and lead-acid type batteries must never be used in combination with one another. The same installation tools used on leadacid batteries must not be used with nickel-cadmium batteries. See WARNING notices in the front of this manual. (a) Unfasten 12 retaining fasteners on the vertical front of the battery box. (b) Pull the battery tray out on the slide assembly. (c) Use a 7/16-inch wrench to remove four nuts and washers securing the battery top retainer to four vertical hold-down bolts. (d) Lift battery top retainer off the four vertical hold-down bolts. (e) Before putting a battery in place on the battery tray, be sure that the positive battery terminal is nearest the front wall and the negative terminal toward the rear wall. Battery No. 1 position is located nearest the shelter aisle. Battery No. 2 position is nearest the roadside wall. (f) Place battery top retainer over battery(s) and over the four vertical hold-down bolts. (g) Replace washers and nuts removed in step (c) above. (h) Tighten nuts evenly so that the battery top retainer is just snug against the battery top edge. Turn nuts finger-tight and add 1/2 turn with a wrench. (i) Ensure that power supply and battery box switches are in the OFF position. (j) Make battery terminal cable connections according to figure 2-5 for BB-501 nickelcadmium batteries of figure 2-6 for BB-297 lead-acid batteries. Be sure that battery cables used are labeled as shown in the boxes in the figures. (k) Slowly, slide the battery tray fully into the battery box. Fasten the front panel to the battery box with the 12 fasteners on the front panel. Change 4 2-9

43 Figure 2-5. Battery cable connections for BB-01. Figure 2-6. Battery cable connections for BB-297. Change

44 2-8. Signal Connections External telephone lines or trunks are connected on the outside of the AN/TTC-41(V)(*) facility at one, two or three SIGNAL ENTRANCE BOX locations. The SIGNAL ENTRANCE BOX to be used depends upon the number of SB-3614(*)(V)/TT used in the facility. a. Locations. The first SIGNAL ENTRANCE BOX is located at curbside, front. The second SIGNAL ENTRANCE BOX is located roadside, front. A third SIGNAL ENTRANCE BOX is located on the roadside, to the rear and next to the second box. Refer to figures 1-1 and 1-2 for SIGNAL ENTRANCE BOX locations. b. Contents. The curbside SIGNAL ENTRANCE BOX contains SIGNAL 1 through SIGNAL 4 (fig. 2-7). SIGNAL 1 and 2 are wired through the patch panel to SB-3614(*)(V)/TT No. 1. SIGNAL 3 and SIGNAL 4 are wired through the patch panel to SB-3614(*)(V)/TT No. 2. The roadside front SIGNAL ENTRANCE BOX contains SIGNAL 5 through SIGNAL 8. SIGNAL 5 and SIGNAL 6 are wired through the patch panel to SB-3614(*)(V)/TT No. 4. The roadside rear SIGNAL ENTRANCE BOX contains SIGNAL 9 through SIGNAL 12. SIGNAL 9 and SIGNAL 10 are wired through the patch panel to SB- 3614(*)(V)/TT No. 5 position and would be used only if a fifth switchboard was to be added to expand an AN/TTC-41(V)4 facility. SIGNAL 11 and 12 are wired only to the patch panel and are provided for emergency use only. c. Arrangement and Hook-ups. Each SIGNAL ENTRANCE BOX has the same hook-up arrangement. Four U-187A/G connectors are located at the lower level of the box. These connectors will mate to the matching U-185B/G or equivalent plug connector on an external 26-pair cable. Above the connectors are two sets of 26- pair binding posts. The binding posts are used for connecting unterminated (loose-ended) telephone field wire pairs or cables without connectors. The binding posts are associated only with the two left-hand cable connectors below them. That is, the binding posts are wired in parallel only with connectors for SIGNAL 1, 2, 5, 6, 9 and 10. Therefore, unterminated pairs of field wire or cables may be connected through internal wiring to SB-3614/TT No. 1 or No. 3 only, and in an expanded facility, to No. 5. SB-3614/TT No. 2 and No. 4 must be connected to external circuits by means of a 26-pair cable connector at SIGNALS 3, 4, 7 and 8. Refer to figure 2-7 for the layout of the SIGNAL ENTRANCE BOX and figure 2-8 for the facility signal distribution diagram. Change

45 Figure 2-7. SIGNAL ENTRANCE BOX, cover removed Change

46 Figure 2-8. AN/TTC-41(V)(*) signal distribution diagram. Change /(2-14 blank)

47 Figure 2-8. AN/TTC-41(V)(*) signal distribution diagram Change

48 2-9. Cable Connections for Nodal and Network Operation, (SB-3614A(V)/TT, Switchboard and C /TTC-41(V), Terminal Control Device). CAUTION Before beginning installation procedures, read the warnings listed on the warning pages and inside cover of this manual. a. Nodal Terminal Operation (outside the shelter). Nodal terminal operation (outside the shelter) employs the Switchboard SB-3614A(V)/TT and Terminal Control Device (TCD) C-11767/TTC-41(V). Connect data/comm interface cable (part number B0358-1) RS-232C connector to SERIAL receptacle on the back panel of the TCD and tighten with a screwdriver. CAUTION To prevent damage to TCD, first connect ground wire to GND stud on the switchboard. b. Nodal Terminal Operation (inside the shelter). Nodal terminal operation (inside the shelter) employs the Switchboard SB-3614A(V)/TT and Terminal Control Device (TCD) C-11767/TTC-41(V). Connect cable (part number B0344-1) RS-232C connector to SERIAL receptacle on the back panel of the TCD and tighten with a screwdriver. At the other end of the cable, connect the ground wire to the Phillips screw located nearest to the test tone jacks on the patch panel of the master switchboard. Insert the patch plug into the test tone jack number pertaining to the master switchboard. NOTE For complete operation and cabling instructions for the TCD, refer to TM c. Network Terminal Operation. Network terminal operation employs only the TCD, disk drive, and printer. SB-3614A(V)/TT is not used in this operation. Connect ground wire on other end of data/ comm interface cable to GND stud on back of switchboard. Connect RCV and XMT wires to I/O RCV and XMT terminals on SB -3614A(V)/TT terminal box. Figure 2-9. Cable Connections, Switchboard SB-3614A(V)/TT for Nodal Terminal Operation (inside shelter). Change

49 Figure Cable Connections, Switchboard SB-3614A(V)/TT for Nodal Terminal Operation (outside shelter). Change /(2-16 blank)

50 CHAPTER 3 OPERATING INSTRUCTIONS TM Section I. CONTROLS AND INDICATORS 3-1. Damage From Improper Settings There are no controls or combinations of controls the operation of which can cause damage to the equipment or create a condition hazardous to operating personnel. Improper operation, however, is likely to cause interruption of service Operator Controls and Indicators Tables 3-1 through 3-12 describe the operator s controls and indicators of the components which make up the AN/TTC-41(V)(*). Refer to figures 2-4 and 3-1 through 3-12 for the location of the controls and indicators. NOTE For detailed operation, programming and capabilities of the SB-3614/TT and SB-3614A(V)/TT switchboards refer to TM and TM , respectively. a. Telephone Switchboard SB-3614(*)(V)/TT Front Panel. Refer to table 3-1 and figure 3-1 for the front panel controls and indicators of the SB-3614(*)(V)/TT. Table 3-1. Telephone Switchboard SB-3614(8)/TT, Controls and Indicators (FRONT) Control, Indicator, Connector Function POWER ON toggle switch and POWER Applies prime power to dc/dc converter. and indicates prime power is applied and ON indicator lamp all dc voltages are present at output of dc/dc converter. Indicates fuse is not blown. 20 HZ FAILURE indicator lamp Indicates excessive load on 20 HZ ringer line. Occasional brief flashes are normal; however, indications in excess of two seconds are abnormal and maintenance is required. CCU FAILURE indicator lamp Lights when processor does not complete scanning cycle within approximately 1.2 seconds. Occasional and infrequent flashes are normal in extremely high traffic periods. NIGHT ALARM sounds simultaneously with illumination of CCU FAILURE lamp. DC FAILURE indicator lamp Lights steady when any of the internal DC voltages has failed or is out of tolerance. Flashes when prime power battery voltage is too low for reliable switchboard operation. NIGHT LIGHT/LAMP TEST NIGHT LIGHT three lamps illuminate TERMINAL, STATUS area, one light illuminates (3 position toggle switch) FORMAT plate, and two lamps illuminate keysender. OFF LAMP TEST and NIGHT LIGHTS off. (Indicators will operate in a normal manner. LAMP TEST All indicators and night lights illuminate. BRIGHTNESS rotary control NIGHT ALARM (audible) NIGHT ALARM VOLUME (rotary control) FUSE HEADSET (connector) HEADSET VOLUME (rotary control) TERMINAL STATUS (indicator lamps) Allows adjustment of all indicator lamp intensities from off to maximum brightness. Sounds (steady interrupted) 2900-HZ tone when CCU failure occurs. Sounds steady 2900-HZ tone when a routine call is in operator's queue HZ tone is interrupted when priority call is in operator's queue. Adjusts volume of NIGHT ALARM from minimum to maximum level as indicated. 4 ampere fast blow fuse in prime power line. Spare fuse is located adjacent to active fuse. Provides means of connecting operator's headset to SB (*) (V) /TT Adjusts volume of sound in operator's headset from minimum to maximum level as indicated. 30 lamps, one per terminal. Illuminates steady when terminal is dialing or is busy with another subscriber. One half HZ flash rate indicates terminal is waiting in the operator's queue. Two HZ flash rate indicates terminal is connected to operator. TERMINAL STATUS (writing surface) Permanent numbers (30 pairs per terminal) indicate the terminal number for either the 30, 60 or 90 terminal configuration. Surface above permanent numbers is for writing optional terminal-peculiar information. Change 4 3-1

51 Control, Indicator, Connector Function MEMORY ACCESS IN PROCESS (indicator Illuminates while memory is being updated. Flashes and error tone occurs in operator s lamp) headset when memory update error is detected. When not illuminated, indicates switchboard is in operate mode. FORMAT (instruction table An instruction format table for memory keysender usage. Defines key to be depressed for various memory update, erase or interrogation functions. PROGRAM/CALL PROCESS (guarded When in down position, normal switchboard call processing occurs. When in up toggle switch) position (raising spring-loaded guard is required), memory update, erase or interrogation is possible. Normal call processing is also possible except for brief periods of update when writing into memory. CALL STATUS (indicator lamp) When not illuminated, indicates the operator is idle. When illuminated steady, indicates operator is connected to a routine party or a routinely marked call. When flashing, indicates operator is connected to priority party or priority marked call. KEYSENDER (four-by-four array of momen- Used to extend call, establish priorities, and write into memory. C pushbutton tary pushbuttons-two illuminated illuminates after second conference call is initiated, indicating both conference links are busy. P pushbutton flashes when depressed in program mode, indicating erase of memory is being made. RE-ENTRY (momentary, illuminated push- Not illuminated. When depressed, causes single party in communication with operator button) be placed first in operator s queue. Party can be re-connected to the operator by depressing CALL ANS. Causes multiple party call in communication with operator to be marked for re-entry. RE-ENTRY will illuminate and operator idle. Illuminated. When depressed will connect operator to multiple party previously marked for reentry. Illuminates when operator is connected to a trunk requiring DTMF tones. When TONE SEND (momentary, illuminated, depressing TONE SEND cause lamp to be extinguished, indicating keysender pushbutton) (SB-3614(V)/TT only, STAFF/DTMF (SB-3614A(V)/TT only) is no longer in tone send mode. STAFF: Pressing this pushbutton when the operator is idle places the switchboard in the UNSTAFF (unattended) operation. STAFF allows operator to perform all functions. UNSTAFF transfers limited operator functions to a designated subset. Flashes when in unstaffed mode. DTMF: It is lit when the keypad is in the tone sending mode. disables the tone sending mode When pressed again it OPR RLSE (operator release) (momentary pushbutton) CLEAR/CDRLS (momentary pushbutton) CALL ANSwer (momentary, illuminated pushbutton) Depressing this pushbutton releases operator from any single or multiple party call and makes him idle. Illuminates when switchboard is in program mode. Depressing switch clears previously entered data. Depressing switch after an erroneous six-digit entry clears entry and unlocks operator function buttons so that another entry can be made. Illuminates steady when all calls in operator s queue are routing. Flashes when one or more calls in the operator s queue are priority. Disconnects operator from previous call and connects him to first call in operator s queue. Change 4 3-2

52 Figure 3-1. Switchboard, Telephone, SB-3614(*)(V)/TT, Front View. 3-3

53 b. Telephone Switchboard SB-3614(*)(V)/TT. Rear Panel. Refer to table 3-2 and figure 3-2 for the rear panel controls and indicators of the SB-3614(*)(V)/TT. Table 3-2. Telephone Switchboard SB-3614(*)(V)/TT, Controls and Indicators (Rear). Control, Indicator, Connector EXTERNAL TERMINAL CONNECTORS MASTER/SLAVE toggle switch NUMBER PLAN three position rotary switch TRUNK HUNTING CONTROL SWBD INTCON (upper connector) SWBD INTCON (lower connector) Function Used to interface directly with terminals or to terminal panel for access to terminal lines through hole-in-head connectors. In single switchboard configuration, must be in Master position. In multiple switchboard configuration. MASTER position designates that the switchboard is used for control, call extension, etc. SLAVE position designates that the switchboard function is subordinated to the MASTER switchboard. Used to select the number designated to terminals connected to the switchboard must have a different position for its NUMBER PLAN switch. Each switch independently enables or disables a trunk group which interfaces with the switchboard. When in ON position in the semi-automatic mode, automatic trunk hunting will occur for each group of four trunks. Connector used to connect to switchboard above in stacked configurations. Connector used to connect to switchboard below in stacked configurations. Change 4 3-4

54 Figure Switchboard, Telephone, SB-3614A(V)/TT, Front View. Change /(3-4.2 blank)

55 Figure 3-2. Switchboard, Telephone, SB-3614(*)(V)/TT, Rear View. 3-5

56 c. Power Supply PP-6224/U. Refer to table 3-3 and figure 3-3 for the PP-6224/U controls and indicators. Table 3-3. Power Supply PP-6224/U, Controls and Indicators. Control, Indicator, Connector Function AC circuit breaker Protects the ac input circuit against overcurrent and also serves as the ac on-off switch. AC indicator lamp (amber Lights to indicate that the ac circuit breaker is ON and that the line voltage is ap plied to the power supply. 230V- 115V selector switch Switch position Function (2-position toggle switch) 230V Connects input circuit for 230-volt input power operation. 115V Connects input circuit for 115-volt input power operation. AC INPUT receptacle (J3) Connects the power supply to an external 115 or 230-volt a c power source through the ac power cord. NORM indicator lamp (green) During local and remote operation, the lamp indicates that a dc output voltage is being produced. EMER indicator lamp (red) Indicates an undervoltage condition or loss of power in the ac power source. DC OUTPUT receptacle providing the power supply is connected to the external battery to light the (J6. Front) lamp. For an input of 115 volts ac, a drop below 80 volts ac causes an undervoltage condition. Normal operation resumes when input power reaches 100 volts ac. DC OUT receptacle Connects the power supply to a remote load through a suitable 4-conductor cable. (J7, Rear) Maximum dc output voltage obtainable at the end of a 25-foot connecting cable is 29.0 volts. BAT IN receptacle Connects the power supply to a local load through the dc power (J8, Rear) cord. Also connects the power supply to the emergency storage battery. so the power supply can function as a battery charger. The DC OUT receptacle DC OUT receptacle (J7) is connected in parallel with the DC OUT receptacle J9. (J9, Rear) Connects the power supply to the emergency battery. When ac input power fails, the dc load is automatically transferred to the battery. Connects the power supply to the load through the dc power cord. Also connects the power supply to an external battery, enabling the power supply to function as a battery charger. DC circuit breaker a. Protects the power supply against overloads in case of failure of the overcurrent limiter. The DC circuit breaker is set to trip when the output current reaches 28.0 b. amperes. Also protects the power supply against reverse polarity when functioning as a battery charger. c. Serves as the DC on-off switch by connecting the dc power to the load. Connects the power supply to an external battery. d. Protects the power supply against over-current when the load is transferred to the external battery during emergency operation. Switch Position Function VOLTAGE-CURRENT selector switch (2 VOLTAGE Connects OUTPUT METER to position toggle switch, spring-loaded in measure dc voltage. VOLTAGE position) CURRENT Connects OUTPUT METER to measure dc current. OUTPUT METER Indicates power supply output voltage or current, depending on the setting of the VOLTAGE-CURRENT selector switch. Also indicates battery voltage when the load has been transferred to the external battery. DC OUTPUT ADJ Adjusts the power supply output voltage from a minimum of 24.0 volts dc to a maximum of 29.0 volts dc in remote operation, and to 32.0 volts dc in local operation. 3-6

57 d. Telephone TA-938/G. Refer to table 3-4 and figure 3-4 for the TA-938 controls and indicators. Figure 3-3. Power supply, PP-6224/U, controls and indicators. Table 3-4. Telephone TA-938/G, Controls and Indicator Control, Indicator, Connector Hookswitch (on handset cradle) Keyset pushbuttons 1-0 Keyset pushbutton * and # Volume Control (on bottom of telephone) Function Opens telephone circuit when the handset is placed on the cradle. Closes telephone circuit when the handset is removed from the cradle. Selects digits necessary to place a telephone call. Not used. Adjusts loudness of ringer tone. Figure 3-4. Telephone set. TA-938/G, controls 3-7

58 e. Telephone Set TA-312/PT. Refer to table 3-5 and figure 3-5 for TA-312/PT controls and indicators. Table 3-5. Telephone Set TA-312/PT. Controls and Indicators. Control, Indicator, Connector Hookswitch Selector Switch EXT INT switch Function Connects Handset H-60/PT to line during operation. Switch is closed when the handset is removed from the retaining cradle and is open when the handset is in the retaining cradle. Connects internal circuits of TA-312/PT for the particular type of service to be used: Position Function CB Common battery operation LB Local battery operation CBS Common battery signaling (Local battery for voice). Permits selection of Handset-Headset H-144 (*)/U in place of Handset H-60/PT: Position Function EXT Selects Handset-Headset H-144 (*)/U INT Selects Handset H-60/PT H-144 (*)/U (*)/U BZ-23/PT Adjusts BZ-23/PT buzzer volume LOW LOUD control When turned, operates G-42/PT generator for signaling in LB operation. Hand crank (part of G-42A/PT) Provides audible indication of incoming call or disconnect. Receptacle Connector U-79/U Allows connection of Handset-Headset H-144(*/)U for use in place of the Handset H- 60/PT. LINE 1-2 binding posts Allows connection of two-line signal wires. BAT connection Used with external batteries. (The BA-30 batteries must be removed from battery compartment). CHANGE 1 3-8

59 Figure 3-5. Telephone Set TA-312/PT, controls and connections. f. Intercommunication Station, LS-147F/FI. Refer to table 3-6 and figure 3-6 for LS-147F/FI controls and indicators. 3-9

60 Table 3-6. Intercommunication Station LS-147F/FI, Controls and Indicators. Control, Indicator, Connector RECEIVE (potentiometer) Pilot lamp (neon-type) PUSH TO TALK switch (two position nonlocking spring-loaded lever switch) SEND control Function Receive speaker volume is increased by turning control clockwise. When lit indicates power is applied to unit. Permits the operator to talk to other stations in the system when depressed; to receive other stations when released. When turned fully counter-clockwise to OFF, power to unit is turned off. When turned clockwise to on, power is applied and volume to all other units in the system is increased as control setting is increased. g. Electric Heater. Refer to table 3-7 and figure 3-7 for the electric heater. Figure 3-6. Intercommunication Station, LS/147F/FI, Controls Table 3-7. Electric Heater, Controls Control, Indicator, Connector Function HEAT-OFF-FAN HEAT Operates fan and heating coil toggle switch OFF FAN Operates the fan for air circulation. TEMPERATURE CONTROL Determines amount of heat, by adjusting from 85 to 55 F. CHANGE

61 h. Air Conditioner. Refer to table 3-8 and figure 3-8 for the air conditioner controls. Figure 3-7. Electric heater, controls. Table 3-8. Air Conditioner, Controls. Control, Indicator, Connector Function DECREASE-INCREASE When turned in a clockwise direction, the temperature is raised. When turned in a potentiometer counterclockwise direction, the temperature is lowered. HI SPEED-LO SPEED Selects fan speed. toggle switch Selector Switch COOL Operates air conditioner compressor and fan. VENTILATE Operates fan only OFF Turns air conditioner/heater system off. LO-HEAT Operates heater at less than full capacity. HI-HEAT Operates heater at full capacity. 3-11

62 Control, Indicator, Connector FRESH AIR DAMPER CHAIN Circuit Breaker reset knob (rear panel) HIGH PRESSURE CUT-OUT reset button rear panel LOW PRESSURE CUT-OUT rent button (rear panel) MOISTURE INDICATOR sight glass (upper right on rear panel) Function Opens and closes fresh air damper; pull chain to recirculate inside air. Pull out then push in to reset internal y mounted circuit breaker. Prevent the compressor from operating if the head pressure becomes excessive. Press to reset. Prevents the compressor from operating if the head pressure bec omes excessive. Press to reset. Indicates the refrigerant moisture content. Excessive moisture is indicated by changing color code from green to yellow. Bubbles and milky appearance indicate low charge. i. Patch Panel. Refer to table 3-9 and figure 3-9 for the patch panel jack field layout. Figure 3-8. Air conditioner, control. Control, Indicator, Connector Table 3-9. Patch Panel Jack Fields. Function SIGNAL 1 LINE Identifies the terminal of 24 pairs of a 26 pair cable from a similarly numbered connector in the SIGNAL ENTRANCE BOX. (The first 12 pairs are for 12 channels SIGNAL 3 LINE of 2-wire signal operation, while the next 12 pairs are for six channel, of SIGNAL 5 LINE signal operation in either 2-wire transmit-receive mode or 4-wire trunk mode). SIGNAL 7 LINE SIGNAL 9 LINE SIGNAL 2 LINE Identifies the terminals of 24 p airs of a 26-pair cable from a similarly numbered SIGNAL 4 LINE connector in the SIGNAL ENTRANCE BOX. The 12 channels are allocated for SIGNAL 6 LINE either 2-wire transit-receive mode or 4-wire trunk mode. SIGNAL 8 LINE SIGNAL 10 LINE SIGNAL 11 LINE Identifies SPARE jack SIGNAL 12 LINE con-actions wired to the SIGNAL ENTRANCE BOX connector. Jacks are not through-wired to the switchboard side of the patch panel, nor to any SB-3614(*)(V)/TT. Change

63 Control, Indicator, Connector Function SIGNAL 1 SWITCHBOARD Identifies all switchboard signal channels numbered 1 through 18 connected to SIGNAL 3 SWITCHBOARD each SB-3614(*)(V)/TT channel numbered 1 through 18. SIGNAL 5 SWITCHBOARD SIGNAL 7 SWITCHBOARD SIGNAL 9 SWITCHBOARD SIGNAL 2 SWITCHBOARD SIGNAL 4 SWITCHBOARD Identifies all switchboard signal channels numbered 19 through 30 connected to SIGNAL 6 SWITCHBOARD each SB-3614(*)(V)/TT channel numbered 19 through 30. SIGNAL 8 SWITCHBOARD SIGNAL 10 SWITCHBOARD CH1 - CH 12 2W Jacks Identifies signal channel jacks numbered 1 through 12. Each channel is used for (LINE and SWITCHBOARD for 2-wire telephone service. Jacks on LINE side are wired normal through to the SIGNALS 1 through 10) corresponding jacks on the SWITCHBOARD side. CH13 - CH30 2W T/R 4W jacks Identifies signal channel (LINE and SWITCHBOARD for jacks numbered 13 through 30. Each channel can be used as either 2-wire or 4- SIGNALS 1 through 10) wire telephone service. Jacks on LINE side are wired normal through to the PHONE CH1 - CH 12 corresponding jacks on the SWITCHBOARD side. PHONE TA-312 PHONE TA-938/G CONFERENCE Identifies jack connections on the LINE side of the patch panel wired to pair number 25 of each SIGNAL. Identifies jack connector wired to the TA-312 located in the shelter and binding posts IabeIed PHONE TA-312, located in the POWER ENTRANCE BOX. Identifies jack connector wired to the TA-938/G located in the shelter and binding post labeled PHONE TA-938, located in the POWER ENTRANCE BOX. Six each jacks wired together into two groups. Each group allows up to six subscribers to be connected together in conference. Change

64 j. POWER DISTRIBUTION BOX. Refer to table 3-10 and figure 3-10 for the POWER DISTRIBUTION BOX controls and indicators. Figure 3-9. Signal patch panel 3-14

65 Table POWER DISTRIBUTION BOX, Controls and Indicators. Control, Indicator, Connector Function VOLTS AC meter AMPERES AC meter FUSE, 1 amp MAIN (circuit breaker #7) PWR SPLY (circuit breaker #1) LGT (circuit breaker #2) AIR CON (circuit breaker #3) BLO (circuit breaker #4) HTR 1 (circuit breaker #5A) HTR 2 (circuit breaker #5B) INTERCOM (circuit breaker #6A) SPARE (circuit breaker #6B) Indicator lights Indicates input voltage, Vac. Indicates current, amps. Protects ac-dc lighting cutover relay. Provides protection for all ac circuits. Energizes and de-energizes and protects circuit to PP-6224/U Power Supplies Protects circuit and provides power for incandescent lights, fluorescent lights, blackout light, door interlock switch and BLACKOUT BYPASS switch. Protects circuit and energizes AIR CONDITIONER power outlet receptacles. Protects circuit and energizes shelter BLOWER power outlet receptacle. Protects circuit and energizes HEATER-1 power outlet receptacle. Protects circuit and energizes HEATER-2 power outlet receptacle. Protects circuit and energizes INTERCOM and convenience outlet receptacles. Not used. Illuminated when associated circuit breaker is in the ON position. 3-15

66 Figure Power distribution box, controls and indicators. 3-16

67 k. Battery Box. Refer to table 3-11 and figure 3-11 for the battery box controls. Table Battery Box Controls. Control, Indicator, Connector CB9 circuit breaker (BATTERY 1 ON-OFF switch) CB10 circuit breaker (BATTERY 2 ON-OFF switch) ALARM (tone) on Roadside Raceway White Pilot Light on Blower Motor Cover Function Protects battery Number 1 and energizes and de-energizes circuit for battery charging. Must be ON to: Supply power from PP-8224/U for battery charging. May be ON or OFF to: Provide battery power to switchboards and emergency lights if ac input power is interrupted. Protects battery Number 2 (if installed) and energizes and de-energizes circuit for battery charging. Must be ON to: Supply power from PP-62241U for battery charging. May be ON or OFF to: Provide battery power to emergency lights if ac power is interrupted. Indicates outside vent for battery box blower is closed. Open vent to silence alarm. Indicates power is on for blower motor. Change

68 l. POWER ENTRANCE BOX. Refer to table 3-12 and figure 2-4 for the POWER ENTRANCE BOX connectors. Figure Battery box, controls Table POWER ENTRANCE BOX connectors. Control, Indicator, Connector Function PHONE TA-312 A and B Binding posts. Connects single pair telephone line to the TA- 312/PT Telephone. PHONE TA-938 A and B Binding posts. Connects single pair telephone line to the TA-938 Telephone. INTERCOM A and B Binding posts. Connects single pair communication line to the LS-147F/FI Intercommunication Station. GROUND TERMINAL Stud and wingnut. Connects the ground cable from the ground rods to the shelter. CONV BREAKER Circuit breaker. Protects the POWER ENTRANCE BOX convenience outlet. Convenience Outlet. 115 VACProvides 115 volts ac for use outside the shelter. IN POWER 115 VAC OUT Power connectors. IN provides for connection of power to the shelter from an external power source. OUT provides for connection of power from the shelter to other facilities requiring 115 volts ac. 3-18

69 Section II. OPERATING UNDER USUAL CONDITIONS TM Preliminary Starting Procedure (6) Adjust the RECEIVER control for a a. Check for proper installation of grounding comfortable listening level. system. e. Heater Operation. (fig. 3-7) b. Be sure the power cable is connected between (1) Connect heater 1 (roadside) power the power source and the POWER ENTRANCE BOX. connector to HEATER 1 receptacle on the roadside wall. c. Ensure that the signal lines are connected (2) Connect heater 2 (front) power connector properly to the facility. to HEATER 2 receptacle on the front wall. d. Set all controls as indicated below to establish a (3) Set the POWER DISTRIBUTION BOX pre-startup condition. Control Setting circuit breakers marked HTR 1 and HTR 2 to ON; light indicators 5A and 5B, respectively, will illuminate. POWER DISTRIBUTION BOX circuit breakers...off (4) Set each heater HEAT-OFF-FAN switch to (except MAIN and LTG circuit breakers) Air conditioner selector switch...off Shelter controls HEAT and adjust each TEMPERATURE control to the desired temperature. For air circulation only, set the HEAT-OFF-FAN switch to FAN. FLUORESCENT LIGHTS switch...off f. Air Conditioner Operation (fig. 3-8) The air conditioner provides cooling, heating and ventilation. To INCANDESCENT COLD START LIGHTS switch...off BLACK-OUT BYPASS switch...off BLOWER switch...off DC LIGHTS switch...off Power supplies AC switch...off operate, set AIR COND circuit breaker on the POWER DISTRIBUTION BOX to ON; light indicator 3 will illuminate. Ensure the air conditioner power connector is connected to the curbside wall receptacle marked AIR COND. Battery box circuit breakers...off (1) Cooling. Switchboard POWER ON switches...off (a) Set the DECREASE-INCREASE Electric heater HEAT-OFF-FAN switch(es)...off control to adjust the temperature. Intercommunication station SEND potentiometer...off (b) Set the fan speed switch to HI SPEED or LOW SPEED as desired Operating Procedure (c) Set the selector switch to COOL. a. Power Application (fig. 3-10). A partial power (d) A damper door control chain and the application was made to turn on the lights. See intake grill are located behind the air conditioner baffle. paragraph 2-7. Proceed as follows: Adjustment of these controls changes the desired type of b. DC Lights. At the roadside DC LIGHTS switch, air circulation. For 100 per cent recirculation, close the set switch to BATT 1 ON position if one storage battery is installed or to BATT 2 ON position if two batteries are installed. damper door. For fresh air mix, open the damper door and partially close the intake grill damper. If the outside air is contaminated, close the damper completely and c. Blower Operation. partially close the intake grill damper. This allows the air (1) Set the POWER DISTRIBUTION BOX to be drawn through a chemical biological filter. circuit breaker marked BLO to ON; light indicator number (2) Heating. 4 will illuminate. (a) Set the DECREASE-INCREASE (2) Set the switch on the ceiling marked control to adjust the temperature. (b) Set the fan speed BLOWER to ON; the blower will operate. switch to HI SPEED or LOW SPEED as desired. d Intercom Operation. (fig. 3-6). (c) Set the selector switch to LO HEAT (1) Operate the POWER DISTRIBUTION or HI HEAT as desired. BOX INTERCOM circuit breaker to ON; light indicator (d) Adjust the damper door control number 6A will illuminate. chain and intake grill for the desired type of air circulation (2) Insert the LS-147 ( ) power cord into the as indicated in (1) (d) above. INTERCOM receptacle on the curbside wall duct. (3) Ventilation (3) Make sure the wire lead exiting the (a) Open the damper door and close SIGNAL WIRING DUCT nearest the LS-147(*) is the intake grill damper. connected to the binding posts on the LS-147(*). (b) Set the fan speed switch to HI (4) Turn the LS-147(*) SEND switch to SPEED or LO SPEED as desired. midpoint; the glow lamp will light. (5) Depress the PUSH-TO-TALK switch and speak into the speaker-microphone on the front panel to transmit. Release the PUSH-TO-TALK switch to receive. Change

70 (c) Set the selector switch to VENTILATE. g. Dc Power Application (fig. 3-3). Dc power is provided by one or two PP-6224/U Power Supplies and one or two storage batteries. The 120 line switchboard configuration uses two power supplies and two batteries. The 30, 60 or 90 line switchboard configuration uses one power supply and one battery. (1) Be sure each PP-6224/U, power cord, is plugged into roadside receptacle(s) marked POWER SUPPLY. (2) On the POWER DISTRIBUTION BOX, set the circuit breaker marked PWR SPLY to ON; light indicator 1 will illuminate and battery blower will operate. (3) On each PP-6224/U perform the following: (a) Ensure that each 230V-115V selector switch is in the 115V position. (b) Set the AC switch to ON; AC indicator lamp will illuminate. NOTE Ensure that each SB-3614(*)(V) /TT POWER switch is in the OFF position. Ensure that each circuit breaker on the battery box is in the OFF position. (c) Ensure that the battery cables are connected to the battery box. (d) Set the power supply DC switch to the ON position; the light indicator marked NORM should illuminate. (e) Remove the protective cap from the DC OUTPUT ADJ potentiometer. Unlock and rotate the DC OUTPUT ADJ potentiometer for 24 volts as indicated on the OUTPUT METER. Lock the DC OUTPUT ADJ potentiometer and replace the protective cap. NOTE The setting for 24 volt is for normal operation of the switchboards when batteries are not being charged. Other voltage settings are required when batteries need charging. Refer to subparagraph 3-4h, below. h. Battery Controls, Operation and Charging. (1) Controls. Controls on the top surface of the battery box consist of two circuit breaker switches. One is marked BATTERY 1, the other BATTERY 2. Each has a labeled ON and OFF position. (2) Operation. When the circuit breaker switches are in the off position, the batteries are in a standby condition. They are not being charged. In the standby condition, they should be fully charged and ready to provide emergency DC power, automatically, in case of an ac power failure. When the switches are in the ON position, the PP-6224/U supplies a charge to the battery. The amount of charge depends upon the setting of the DC OUTPUT ADJ potentiometer which controls the voltage reading of the OUTPUT METER on the PP-6224/U. (3) Charging. Batteries BB-501 and BB-297 require different charging rates. Refer to the TM for each type of battery for reasons and additional details. NOTE Do not attempt to check the specific gravity of the electrolyte in a BB-501. The specific gravity in this nickelcadmium type battery does not change from discharged to charged state. (a) BB-501 Charge Rates. 1. Float charge. Set POWER SUPPLY, PP- 6224/U output voltage to 27.5 volts dc. 2. Constant Voltage Charge. Set POWER SUPPLY PP-6224/U output voltage to 29.5 volts dc. Refer to TM for all details in the operation and maintenance of a nickel-cadmium battery. (b) BB-297 Charge Rates. 1. Float Charge. Set POWER SUPPLY PP-6224/U output voltage 26 volts dc. 2. Constant Voltage Charge for discharged condition. Set POWER SUPPLY PP-6224/U output voltage to 28 volts dc. Charge at this rate until the specific gravity of the electrolyte becomes constant after three readings taken at 30 minute intervals. A fully charged battery should give a hydrometer reading, corrected for temperature, of to Maintain an electrolyte temperature below 130 F (54 C) by interrupted charging. That is, turn off the battery circuit breaker switch to stop charging. Refer to TM for further operating instructions on lead-acid batteries. 3. Checking for Specific Gravity with a Hydrometer. Compress the rubber bulb completely to force most of the air out and immerse the flexible syringe tip well below the surface of the battery electrolyte. When pressure on the rubber bulb is released, slowly, a vacuum is created to suck the liquid into the syringe, floating the hydrometer. Suck in only enough fluid to lift the float. A liquid height of about 2 to 3" in the glass barrel should be sufficient to allow the float to become buoyant. The float should not be in contact with the walls of the barrel. The syringe should be held perfectly upright so that a correct specific gravity reading may be obtained. Read the float scale at the point where it emerges from the liquid surface. A thermometer with a correction scale is provided to correct the specific gravity reading should the liquid temperature be higher or lower than 80 F. After noting the float reading, observe the thermometer reading and apply the necessary correction to the float reading. These corrections are shown on the plastic scale, opposite the temperature scale, and should be added or subtracted as indicated. Change

71 Example: Hydrometer float reads Sp. Gr. Thermometer reads 110 F Add to float reading correction 12 Actual Specific gravity of electrolyte Sp. Gr. After each use, the syringe should be flushed with fresh water as the electrolyte is corrosive and will damage clothing, metals, etc. CAUTION The syringe has glass parts which are fragile, so handle it carefully. Do not drop it. Always discharge the electrolyte back into the battery after noting the float and temperature readings. The acid is corrosive and can damage skin, eyes, and clothing, etc. Should the hydrometer not float in the solution, either the electrolyte density is very low, indication a weak or dead battery, or the hydrometer may be damaged. i. Switchboard Operation NOTE SB-3614(*)(V)/TT No. 1 is the MASTER switchboard in the AN/TTC-41(V)2 and 3. SB-3614(*)(V)/TT No. 1 and No. 4 are MAST switchboards in the AN/TTC-41(V)4 and in an expanded facility using five switchboards. All other switchboards are SLAVE. (1) Set the POWER switch on each SLAVE switchboard to the ON position; PWR ON lights will illuminate. Set the POWER switch on each MASTER switchboard to the ON position. (2) For complete operating details o the SB- 3614/TT and SB-3614A(V)/TT, refer to TM and TM , respectively. j. Patch Panel Capability. The purpose of the patch panel is for testing, troubleshooting and rerouting subscriber lines. During normal operations, telephone calls do not have to be patched between LINE and SWITCHBOARD since the patch panel is through-wired. If a patch cord is inserted into a jack on either the LINE or SWITCHBOARD side of the patch panel at the same time that two subscribers are connected, the subscribers will be disconnected. A few examples of patch panel use are listed below: (1) OPERATE jacks (five jacks-each for a separate switchboard). Every jack represents a switch connection for an external telephone for use by the operator or supervisor. Telephone subset may be TA- 312/PT in the LB mode. (2) TEST jacks (five jacks-each for a separate switchboard). Each jack provides access to a switchboard test-tone (1050 HZ generator for testing). Place one end of a single-plug patch cord into a TEST jack and the other end into the LINE side jack of a subscriber line. The operator, using keysender line. The operator, using keysender, keys N99, where N is any digit 1 to 6. A test tone is sent to the subscriber set. (3) PHONE jacks CH1 through CH12. These jacks represent patch panel connections of pair number 25 of each SIGNAL cable connected at a SIGNAL ENTRANCE BOX. CH1 jack is a termination of pair number 25 of SIGNAL 1. CH2 jack is a termination of pair number 25 of SIGNAL 2, and so on. The operator may insert a single-plug patch in any of these 2-wire circuit jacks that are active and patch that subscriber to any 2-wire line or switchboard channel. Or the operator may patch any of the upper PHONE jacks to the TA- 312/PT subset in the shelter. (4) CONFERENCE jacks. Normally, subscribers are connected together in conference through the switchboard(s) with operator assistance. Conferencing may be done for 2-wire line subscribers, in LB position, by using patch cords between the LINE JACKS and CONFERENCE jacks. (5) LINE TO SWITCHBOARD patches. Subscriber lines or trunks may be patched to other switchboard channel assignments, if required. Use single-plug patch cords for 2-wire circuits and doubleplug patch cords for 4-wire circuits. (6) SPARES jacks. The SPARES jacks are connected to the connector blocks for SIGNALS 11 and 12 in the roadside, rear SIGNAL ENTRANCE BOX. If spare external cables are attached, the jacks may be used for patching spare lines or trunks into SB-3614 (*)(V)/TT switchboard channel. (7) TA-938 jack. The TA-938 subset inside the shelter and the TA-938 binding posts in the POWER ENTRANCE BOX are both connected to this jack. The purpose of the TA-938/G is to allow the TA-938/G to place or receive calls through a SB-3614(*)(V)/TT. Insert a single-plug patch cord into the TA-938 jack. Insert the other end of the patch cord in the transmit jack (left) of an unused switchboard channel, CH13 through CH30, which is set up to accept common battery DTMF subsets. (8) TA-312 jack. The TA-312 subset inside the shelter and the TA-312 binding posts in the POWER ENTRANCE BOX are both connected to this jack. The TA-312/PT jack allows the TA-312/PT to be used in a variety of ways. The TA-312/PT may be patched directly into a switchboard channel which is set up to accept a 2- Change

72 wire, ringdown or common battery circuit. The TA- 312/PT, in the LB mode, may be patched directly into a LINE jack to a 2-wire ringdown subset. This action bypasses the switchboard. The TA-312/PT also may be patched into SPARE line jacks, CONFERENCE jacks or PHONE jacks Stopping Procedure for Standby Condition On SB-3614 (*)(V)/TT switchboard, depress the OPR RLSE momentary pushbutton to release the operator from the operator s queue and place the operator in the idle state. During the standby state, 20-HZ ringdown and CBS subscribers cannot be serviced by the operator. Common battery DTMF subscribers will have automatic call extension for local calls, trunk calls and manual trunks. Common battery dial pulse subscribers will have automatic call extension for local calls Stopping Procedure for Shutdown a. Set SB-3614(*)(V)/TT switchboard POWER ON/OFF toggle switch to OFF. b. Set battery box circuit breaker(s) to the OFF position. c. Set the PP-6224/U power supply DC circuit breaker to the OFF position. d. Set the PP-6224/U power supply AC circuit breaker to the OFF position. e. Set the switch on the overhead wire duct marked BLOWER 1 to the OFF position. f. Turn the LS-147/FI SEND switch fully counterclockwise; the glow lamp will extinguish. g. Ensure each heater HEAT-OFF-FAN switch is set to the OFF position. h. Ensure the air conditioner selector switch is set to the OFF position. i. Set the FLUORESCENT LIGHTS switch and the INCANDESCENT COLD START LIGHTS switch to the OFF position. j. On the POWER DISTRIBUTION BOX, sequentially set the circuit breakers to OFF as follows: (1) INTERCOM (2) SPARE (3) HTR 1 (4) HTR 2 (5) BLO (6) AIR COND (7) LTG (8) PWR SPLY (9) MAIN 3-7. Preparation for Movement a. Check to ensure all items such as technical manuals, chairs, hammer, screwdriver and other loose items are stowed in their proper locations. Be sure that all equipment panels are closed and latched. b. Shut down the power as described in paragraph 3-6. c. Shut down the external power source, disconnect both ends of the power cable, then close and latch the entry panel cover. Install protective caps on the connectors and then roll the cable onto the cable reel. Stow the cable reel inside the shelter on the floor and fasten down. d. The exhaust blower assembly on the front of the assemblage may come in contact with the transporting vehicle. If so, it must be removed and stored. e. Remove signal cable connectors and lines from SIGNAL ENTRANCE BOXes. Secure connector covers in place, then close and latch the panel covers. f Disconnect the ground strap from the ground rod andstow the strap inside the assemblage. Remove the ground rod and secure inside the assemblage. g. Stow the boarding ladder inside the assemblage. h. Ensure the cabinet doors and the drawers are closed and latched. i. Ensure that outside panel covers are closed and latched. Close and latch the entry door. The assemblage is now ready for movement. Section III. OPERATING UNDER UNUSUAL CONDITIONS 3-8. Operation in Hot, Moist Climates In hot, moist climates, the equipment is subject to damage from moisture and fungi. Be extremely watchful for this condition. Wipe all moisture and fungi from the exterior of the equipment with a lint-free cloth Operation in Hot, Dry Climates In hot, dry climates, the connectors, receptacles and binding posts are subject to damage from dirt, dust, and sand. Always cover the POWER ENTRANCE BOX and SIGNAL ENTRANCE BOX when not in use and replace the covers over the connectors and receptacles Operation in Arctic Climates Extreme cold causes cables and wires to become hard, brittle, and difficult to handle. Be careful when handling and connecting the cables to the shelter. Be sure that kinks and unnecessary loops will not result in permanent damage. Change

73 To keep POWER ENTRANCE BOX and SIGNAL ENTRANCE BOX binding posts, receptacles, and connectors free of frost, snow, and ice, replace connector and receptacle covers and close the box covers when not in use. NOTE In cold temperatures, the use of BB- 501 nickel-cadmium battery is recommended. Resistance to freeze makes the BB-501 much more suitable than a lead-acid type battery. capable of operation for approximately four (4) hours, provided that the storage batteries are in a fully charged condition. A relay in the PP-6224/U power supply will automatically switch to the dc standby power mode allowing the battery to power the switchboards and dc illumination. The telephone sets will operate as usual, but the LS-147/FI intercommunication station will not operate in the dc mode. Should the ac power fail, set all the circuit breakers on the POWER DISTRIBUTION BOX to OFF. Upon restoration of ac power follow the power application steps in paragraph Operation Under Emergency Conditions (limited service) In the event of an ac power failure, the facility is 3-23

74 CHAPTER 4 OPERATOR AND ORGANIZATIONAL MAINTENANCE Section I. GENERAL 4-1. Tools, Test Equipment and Material Required Tools and test equipment required for operator and organizational maintenance of the AN/TTC-41(V)(*) are authorized by the Maintenance Allocation Chart, appendix D. The following materials are required: a. Trichlorotrifluoroethane b. Lint-free cloth. c. Camel s-hair brush. d. Grease, Graphite, Aircraft (CGA). e. Lubricating Oil, General Purpose. f. Preservative (PL-Special). g. Lubricating Oil, Engine (OE-10). h. Cement, gasket. i. Nylon Brush CAUTION The exterior surface of the shelter has been painted with a special solar reflecting paint which has the effectiveness of a white surface Paints and Finishes a. Shelter. Shelters painted with solar heat reflecting paint are easily identified by the forest green color. Shelters not painted with solar heat reflecting paint are olive drab in color. USE ONLY THE FOLLOWING PAINTS FOR TOUCH-UP OR COMPLETE RE-PAINTING OF THE SHELTER. (1) Undercoat. Use white, lusterless enamel, produced in accordance with Federal Specification TT-E- 516A, Enamel, Lusterless, Quick-Drying Styrenated Alkyd Type. It is available in a 1-pint pressureized can (NSN ). (2) Topcoat. Use the following green, lusterless enamel, produced in accordance with Military Specification MIL-E-46061A, Enamel Camouflage, Solar and Heat Reflecting. It is available in a 1 quart container (NSN ) and in a 1-gallon container (NSN ). NOTE The existing paint need not be removed before applying the solar heat reflecting paint; simply clean the surface well before applying the white undercoat. When the undercoat is dry, apply the green topcoat. If the shelter has been repaired, or the original paint is in poor condition, prepare the surface in accordance with the instruction in MIL-F-14072B, Finishes for Ground Electronic Equipment, and use the white lusterless enamel as an undercoat. b. Installed Items. When any of the installed items require painting, refinishing or touch-up painting, refer to Federal Standard 595A for a matching color. c. Painting Tools and Equipment. SB lists painting tools and miscellaneous supplies required for painting Touch-up Painting Instructions a. Refer to TB for instructions on painting andpreserving Electronics Command equipment. In touch-up painting a perfect match with the exact shade of the original paint surface may not be possible. There are many reasons for this, such as a change in the original pigment because of oxidation and differences as a result of manufacture. The prevention of corrosion and deterioration is the most important consideration in touch-up painting; appearance is secondary This, however, should not be construed to mean that appearance of the equipment is not important. Touch-up painting should be accomplished neatly and in a good workmanship manner. Inspection personnel in the field should make allowances for slight color mismatch where minor touch-up has been done, but not for neglect, poor workmanship or in cases where the need for refinishing is obvious. b. Remove rust and corrosion from metal surfaces by lightly sanding them with fine sandpaper. Brush two thin coats of paint on the bare metal to protect it from further corrosion. 4-4 Lubrication Instructions Refer to TB for shelter lubrication instructions. Change 2 4-1

75 Section II. OPERATOR/CREW AND ORGANIZATIONAL PREVENTIVE MAINTENANCE CHECKS AND SERVICES (PMCS) AND SYSTEM READINESS CRITERIA 4-5. GENERAL. a. Maintenance Forms and Records. The forms and records you fill out have several uses, including: (1) a permanent record of the services, repairs, and modifications made on your equipment; (2) reports to the next level of maintenance and to your commander; and (3) a checklist for you when you want to know the status of the equipment after its last use, and whether faults, if any, have been fixed. For information on forms and records, see DA PAM (if USMC, see TM /ld). b. Routine Checks. Routine checks, such as cleaning, dusting, washing, stowing items not in use, covering unused receptacles, and checking for damage, are not listed as PMCS checks. They are things you should do any time you see they must be done. Ensure that all discrepancies are noted and corrected. c. Operator PMCS. Operator s PMCS are the required periodic inspections and actions necessary to keep your equipment in good operating condition. NOTE There is no Organizational PMCS for this equipment. d. System Readiness Criteria. System Readiness Criteria are those standard, specific requirements your system must meet for it to be mission-capable PMCS Table (table 4-1). The PMCS table lists all the scheduled maintenance tasks required for your system. a. Explanation of Columns. (1) Item No. This column contains a number for each procedure to be performed. When reporting malfunctions or failures on DA Form 2404, Equipment Inspection and Maintenance Worksheet, place this number in the "TM Item No." column. Change 5 4-2

76 Table 4-1. Preventive Maintenance Checks and Services Interval Item Item To Be Inspected Equipment Is Not No. B D A W M Procedure:/Ready/Available If: 1 Truck (1) 1 1/4 Ton (M-1028) Follow PMCS procedures in TM Truck is inoperative and no substitute is available. 2 Generator Set PU-620/M (2 generators in set) Follow PMCS procedure in TM One generator is inoperative. available. 3 Grounding Rod MX-148/G * * Check grounding system to Unable to ground see that it is properly properly. installed. Tighten loose ground connections. 4 Shelter Door Air Filter * Clean or replace as necessary. 5 Shelter Blowers * * Check blowers for proper Blowers fail to air flow. Clean as operate. necessary. 6 Air Conditioner Follow PMCS procedures in TM Inside temperature cannot be maintained between degrees Fahrenheit and humidity between 20-80%. 7 Heater, Electric * * Check for proper heat output. Change

77 Table 4-1. Preventive Maintenance Checks and Services (cont d) Interval Item Item To Be Inspected Equipment Is Not No. B D A W M Procedure:/Ready/Available If: 8 Lead Acid Storage Battery BB-297 WARNING Do not smoke, have open flames, or make sparks around your battery. If a battery is gassing, it can explode and cause injury. * Check the electrolyte Electrolyte level is level. Electrolyte should low or boiling. Notify be filled to the ledge in unit maintenance. the battery filler opening (vent). See top of cap for reminder. * Make sure the vent holes in the vent caps are open to permit escape of gases. Make sure caps are screwed on tightly. * Inspect terminals (posts), clamps, cables, and battery hold down for corrosion. If corroded, notify unit maintenance. * Make sure a light coat of GAA grease covers posts and terminals after clamping. Keep grease from between the post and terminals. * Make sure rubber grommets are in place to keep the cable from getting cut on the edge of holes. 9 Battery Box * Check for pilot light on top of battery box. Change

78 Table 4-2. SYSTEM READINESS CRITERIA System ratings Fully Mission Capable (FMC) Not Mission Capable (NMC) AN/TTC-41(V)1-4 Equip Q Item Subsystems and Model t REMARKS No. Components ID # y 1R Shelter, Electrical S-250/G 1 System may be rated FMC Equipment (wired with with component(s) rated NMC following components): if that/those component(s) are not required to support mission. 2R Battery, Storage BB One BB-297 required for (Lead Acid) (V) 1, 2, and 3. Two BB-297 s required for (V) 4. 3R Battery, Storage BB One BB-501 required for (NiCad) (V) 1, 2, and 3. Two BB-501 s required for (V) 4. 4R Blower Assembly 2 5R Heater, Electric 1 6R Intercommunication LS-147F/ 1 System may be rated FMC if Station F1 one LS-147F/FI is rated NMC 7R Patch Panel 1 System may be rated FMC if patch panel is rated NMC. 8R Power Supply PP One PP-6224/U required for /U (V) 1, 2, and 3. Two PP-6624/U s required for (V) 4 9R Switchboard, SB One SB-3614A/TT required Telephone A/TT for (V) 1. Two SB-3614A/TT s required for (V) 2. Three SB-3614A/TT s required for (V) 3. Four SB-3614A/TT s required for (V) 4. 10R Telephone, Push- TA-938/G 1 button Change

79 Table 4-2. SYSTEM READINESS CRITERIA (cont d) System ratings: Fully Mission Capable (FMC) Not Mission Capable (NMC) AN/TTC-41(V)1-4 Equip Q Item Subsystems and Model t REMARKS No. Components ID # y 11R Telephone Set TA System may be rated FMC if TA-312 is rated NMC. 12R Terminal Control C-11767/ 1 System may be rated FMC if Device TTC-41V C is rated NMC. 13R Air Conditioner 1 System may be rated FMC if inside temperature can be maintained between degrees Fahrenheit and humidity between 20-80%. 14R Cable, 100 FT Power CX-7453A 1 /U 15R Cable, 15 FT Power CX-7705A 1 Stub /U 16R Generator Set PU (2 generators in set) 17R Grounding Rod MX-148/G 2 System may be rated FMC if one MX-148/G is rated NMC. 18R Installation Kit MK One MK-1885 required for (V) 1. Two MK-1885 s required for (V) 2. Three MK-1885 s required for (V) 3. Four MK-1885 s required for (V) 4. 19R Truck, 1 1/4 Ton M System may be rated FMC if appropriate substitute is available. *U.S. GOVERNMENT PRINTING OFFICE: /61051 PIN: Change

80 (2) Interval. These columns tell you when to do a procedure. Each column that applies will contain an asterisk (*). Some procedures will have asterisks in more than one column. (3) Item to be inspected/procedure. This column contains the name of the item to be inspected and tells how to perform the required checks and services on it. Carefully follow these instructions and perform them in the order listed. (4) Equipment is not ready/available if:. This column tells you the conditions which will cause the equipment to be classified as not ready (red) for readiness reporting. NOTE If the equipment must be kept in continuous operation, check and service only those items that can be checked and serviced without disturbing operation. Make the complete checks and services when the equipment can be shut down. b. Instructions. (1) Do your before (B) preventive maintenance just before you operate your equipment. Pay attention to CAUTIONS and WARNINGS. (2) Do your during (D) preventive maintenance while the equipment and/or its components systems are in operation. (3) Do your after (A) preventive maintenance right after operating the equipment. Pay attention to the CAUTIONS and WARNINGS. (4) Do your weekly (W) preventive maintenance once a week. (5) Do your monthly (M) preventive maintenance once a month. (6) If something doesn t work, troubleshoot it with the instructions in this manual and notify your supervisor. (7) Always do your preventive maintenance in the same order. (8) If anything goes wrong and you can t fix it, write it on your DA Form 2404, or applicable form. If you find something seriously wrong, report it to the next level of maintenance IMMEDIATELY. Change 5 4-3

81 WARNING Never operate the generator or shelter until is has been properly grounded. Electrical defects in the load lines or equipment can cause DEATH by electrocution when contact is made with an ungrounded system. WARNING USE OF CLEANING SOLVENT Adequate ventilation should be provided while using TRICHLOROTRIFLUOROETHANE. Avoid prolonged breathing of vapor. The solvent should not be used near heat or flame; the products of decomposition are toxic and irritating. Since TRICHLOROTRIFLUOROETHANE dissolves natural oils, avoid prolonged contact with skin. The use of chemical gloves (solvent resistant), chemical splash goggles and full faceshield are required when using TRICHLOROTRIFLUOROETHANE. DO NOT use compressed air to dry parts when TRICHLOROTRIFLUOROETHANE has been used. TRICHLOROTRIFLUOROETHANE is an ozone-depleting substance. WARNING Compressed air is dangerous and can cause serious bodily harm if protective means or methods are not observed to prevent a chip or particle (of whatever size) from being blown into the eyes or unbroken skin of the operator or other personnel. Compressed air shall not be used for cleaning purposes except where reduced to less than 30 pounds per square inch gauge (30 psig) and then only with effective chip guarding and personnel protective equipment (industrial safety glasses and full faceshield). DO NOT use compressed air to dry parts when TRICHLOROTRIFLUOROETHANE has been used. Change 8 4-4

82 Table 4-1. Preventive Maintenance Checks and Services Interval Item Item To Be Inspected Equipment Is Not No. B D A W M Procedure: Ready/Available If: 1 Truck (1) 1 1/4 Ton (M-1028) Follow PMCS procedures in TM Truck is inoperative and no substitute is available. 2 Generator Set PU-620/M (2 generators in set) Follow PMCS procedure in TM Both generators are inoperative and no substitutes are available. 3 Grounding Rod MX-148/G * * Check grounding system to Unable to ground see that it is properly properly. installed. Tighten loose ground connections. 4 Shelter Door Air Filter * Clean or replace as necessary. 5 Shelter Blowers * * Check blowers for proper Blowers fail to air flow. Clean as operate. necessary. 6 Air Conditioner Follow PMCS procedures in TM Air Conditioner is inoperative and no substitute is available. 7 Heater, Electric * * Check for proper heat output. Change

83 Table 4-1. Preventive Maintenance Checks and Services (cont d) Interval Item Item To Be Inspected Equipment Is Not No. B D A W M Procedure: Ready/Available If: 8 Lead Acid Storage Battery BB-297 WARNING Do not smoke, have open flames, or make sparks around your battery. If a battery is gassing, it can explode and cause injury. * Check the electrolyte Electrolyte level is level. Electrolyte should low or boiling. Notify be filled to the ledge in unit maintenance. the battery filler opening (vent). See top of cap for reminder. * Make sure the vent holes in the vent caps are open to permit escape of gases. Make sure caps are screwed on tightly. * Inspect terminals (posts), clamps, cables, and battery hold down for corrosion. If corroded, notify unit maintenance. * Make sure a light coat of GAA grease covers posts and terminals after clamping. Keep grease from between the post and terminals. * Make sure rubber grommets are in place to keep the cable from getting cut on the edge of holes. 9 Battery Box * Check for pilot light on top of battery box. Change

84 Table 4-1. Preventive Maintenance Checks and Services (cont d) Interval Item Item To Be Inspected Equipment Is Not No. B D A W M Procedure: Ready/Available If: 10 Telephone Set TA-312/PT * Batteries- Inspect for foreign matter and corrosion- Clean as necessary. 11 Intercommunication Station LS-147F/FI * Check to see that power cord is connected to equipment ground. 12 Emergency Power * * Turn off main circuit Switchboards will not breaker during a period of run on batteries. no traffic. Operate switchboards on battery power. Change

85 4-7. System Readiness Criteria table (table 4-2). The System Readiness Criteria table is your "checklist" for determining the mission readiness of your system. a. Explanation of Columns. (1) Item No. This column contains a number for each readiness-reportable item. When reporting, on DA Form 2404, Equipment Inspection and Maintenance Worksheet, malfunctions or failures that cannot be repaired "on-the-spot," place this number in the "TM Item No." column. (2) Subsystems and Components. This column lists all system equipments which are required for readiness reporting. (3) Equip Model ID #. This column contains the equipment model identification number (type-classification) of each equipment. (4) Qty. This column tells you the quantity of equipment/items furnished as part of, or with, your system. (5) Remarks. This column contains other information/special instructions and will alert you to any exceptions to the requirements, designed to give you maximum mission flexibility. b. Instructions. Perform the following steps to determine system readiness: (1) BEFORE starting your mission, ensure that listed equipments/items are on hand and operational. If necessary, perform operational checks in applicable TM s to determine the condition of your equipment. (2) Take note of REMARKS column. This column contains exceptions and special instructions to help you tailor your requirements to your mission. (3) If any required equipment/item is not on hand and operational, your entire system is deadlined (unless otherwise noted in the REMARKS column). (4) Correct any discrepancies, then re-check all equipments/items on list. When all required equipment/items are on hand and operational, your system is mission-ready. (5) AFTER completing your mission, and before moving to a new location, ensure that all listed equipments/items are on hand Deleted. Change

86 Table 4-2. SYSTEM READINESS CRITERIA System ratings: Fully Mission Capable (FMC) Not Mission Capable (NMC) AN/TTC-41(V)1-4 Equip Q Item Subsystems and Model t REMARKS No. Components ID # y 1R Shelter, Electrical S-250/G 1 System may be rated FMC Equipment (wired with with component(s) rated NMC following components): if that/those component(s) are not required to support mission. 2R Battery, Storage BB One BB-297 required for (Lead Acid) (V) 1, 2, and 3. Two BB-297 s required for (V) 4. 3R Battery, Storage BB One BB-501 required for (NiCad) (V) 1, 2, and 3. Two BB-501 s required for (V) 4. 4R Blower Assembly 2 5R Heater, Electric 1 6R Intercommunication LS-147F/ 1 System may be rated FMC if Station FI one LS-147F/FI is rated NMC 7R Patch Panel 1 System may be rated FMC if patch panel is rated NMC. 8R Power Supply PP One PP-6224/U required for /U (V) 1, 2, and 3. Two PP-6624/U s required for (V) 4 9R Switchboard, SB One SB-3614A/TT required Telephone A/TT for (V) 1. Two SB-3614A/TT s required for (V) 2. Three SB-3614A/TT s required for (V) 3. Four SB-3614A/TT s required for (V) 4. 10R Telephone, Push- TA-938/G 1 button Change

87 Table 4-2. SYSTEM READINESS CRITERIA (cont d) System ratings: Fully Mission Capable(FMC) Not Mission Capable (NMC) AN/TTC-41(V)1-4 Equip Q Item Subsystems and Model t REMARKS No. Components ID # y 11R Telephone Set TA System may be rated FMC if TA-312 is rated NMC. 12R Terminal Control C-11767/ 1 System may be rated FMC if Device TTC-41V C is rated NMC. 13R Air Conditioner 6KBTU 1 System may be rated FMC if appropriate substitute is available. 14R Cable, 100 FT Power CX-7453A 1 /U 15R Cable, 15 FT Power CX-7705A 1 Stub /U 16R Generator Set PU System may be rated FMC if (2 generators in set) one generator is rated NMC. 17R Grounding Rod MX-148/G 2 System may be rated FMC if one MX-148/G is rated NMC. 18R Installation Kit MK One MK-1885 required for (V) 1. Two MK-1885 s required for (V) 2. Three MK-1885 s required for (V) 3. Four MK-1885 s required for (V) 4. 19R Truck, 1 1/4 Ton M System may be rated FMC if appropriate substitute is available. Change PIN:

88 SECTION III. TROUBLESHOOTING AND MAINTENANCE 4-9. GENERAL. The troubleshooting chart (table 4-4) and the technical manual applicable to each component are used to systematically check the facility for proper performance. Only operator and organizational corrective actions are given in the corrective actions column. If the corrective actions do not correct the fault, request higher category of maintenance. When using the chart, look in the symptoms column for the equipment failure, check each probable cause, then follow the corrective actions. Refer to the technical manuals in the corrective action column if applicable. WARNING Hazardous voltages are used in the operation of this equipment. DEATH ON CONTACT may result if personnel fail to observe safety precautions. Components in the system may have hazardous voltages on exposed terminals. Before working inside any equipment, set power switches to OFF positions and remove power cables from the power source. Ground high voltage points before touching them. *U.S. GOVERNMENT PRINTING OFFICE: /61050 Change 5 4-5/(4-6 blank)

89 Section III. TROUBLESHOOTING AND MAINTENANCE 4-9. General The troubleshooting chart (table 4-4) and the technical manual applicable to each component are used to systematically check the facility for proper performance. Only operator and organizational corrective actions are given in the corrective actions column. If the corrective actions do not correct the fault, request higher category of maintenance. When using the chart, look in the symptoms column for the equipment failure, check each probable cause, then follow the corrective actions. Refer to the technical manuals in the corrective action column if applicable. WARNING Hazardous voltages are used in the operation of this equipment. DEATH ON CONTACT may result if personnel fail to observe safety precautions. Components in the system may have hazardous voltages on exposed terminals. Before working inside any equipment, set power switches to OFF positions and remove power cables from the power source. Ground high voltage points before touching them. Change 3 4-6

90 Table 4-4. Troubleshooting the AN/TTC-41(V)(*). Symptom Probable cause Corrective action Switchboard fails to operate a. Operating power disrupted. a. Restore operating power. b. Defective signal cables. b. Check at patch panel for input signals. c. Defective switchboard. c. Replace switchboard (para 4-11). (Refer to DEP ). PP-6224;U fails to operate a. Operating power disrupted. a. Restore operating power. b. Defective PP-6224/U b. Replace PP-6224/U (para 4-10). (Refer to TM ). Electric heater does not operate a. Operating power disrupted. a. Restore operating power. b. Defective electric heater b. Replace electric heater (para 4-12). LS-147F/U fails to operate a. Operating power disrupted. a. Restore operating power. Check fuse. b. Intercom signal line disconnected. b. Check and reconnect or replace if necessary. c. Defective LS-147F/U c. Replace LS-147F/U (para 4-15). (Refer to TM ). Air conditioner does not operate a. Operating power disrupted. a. Restore operating power. b. Defective air conditioner. b. Replace air conditioner (para 4-16). (Refer to TM ). Shelter blower does not operate a. Operating power disrupted. a. Restore operating power. b. Defective shelter blower. b. Replace shelter blower (para 4-17). Battery blower a. Operating power disrupted. a. Restore operating power. does not operate b. Defective battery box blower. b. Replace battery box blower (para 4-18). Storage battery a. Defective Storage battery a. Replace battery (para 4-19). (Refer to fails to operate. TM or TM ). b. Defective cutover relay in PP-6224/U b. Replace PP-6224/U (para 4-10) (Refer to TM Telephones fail to operate a. Disconnected or defective signal lines a. Reconnect or replace defective signal lines. b. Defective Telephone. b. Replace defective telephone (para 4-13 or 4-14) Replacement of Power Supply PP-6224/U a. Removal (1) At the POWER DISTRIBUTION BOX, place the circuit breaker switch marked PWR SPLY in the OFF position. (2) On the front panel of the PP-6224/U, place AC and DC switches to OFF position. (3) Disconnect the ac power cable from the ac input connector marked J3. (4) Use a 7/16-inch wrench to remove two 1/4-20 machine screws holding slide shelf to the rack. Retain the screws. (5) Pull the PP-6224/U out fully on its slide shelf. (6) Reach behind the PP-6224/U and disconnect two dc power cables from the J7 and J8 connectors. When disconnecting these cables from the lower No. 1 position, the upper slide shelf must be pulled out also in order to reach the cables of the lower POWER SUPPLY. (7) Use a 1/2-inch wrench to remove four 5/16-18 machine screws which hold the PP-6224/U to the slide shelf. Retain the screws. (8) Lift the PP-6224/U off its slide shelf. b. Replacement. (1) Place the PP-6224/U on the extended slide shelf, over the four shelf mounting holes. Secure the PP-6224/U to the shelf with four screws removed in step a (7) above. (2) Connect dc power cables to connectors J7 and J8 on the rear panel of the PP-6224/U. For PP U NO. 1, connect cable marked, "DC PWR SUP NO. 1 SC-D ", to connector J7. Connect cable marked "DC PWR SUP, J8 BATT IN, NO. 1 SC-D " to connector J8. For PP-6224/U NO. 2, the two cables are identified in a similar manner. (3) Slide the PP-6224/U back into the rack. (4) Fasten the slide shelf to the rack with two 1/4-20 machine screws removed in step a (4) above. (5) Connect the ac power cable on the front panel connector, J3 AC INPUT. (6) At the POWER DISTRIBUTION BOX, set circuit breaker switch PWR SPLY to ON position. (7) At the PP-6224/U, place AC and DC switches to the ON position. (8) Adjust dc voltage at desired level Replacement of Switchboard, Telephone SB- 3614(*) (V)/TT a. Removal. (1) At the switchboard to be removed, set the POWER switch to OFF. Remove headset plug. (2) At the PP-6224/U, turn AC and DC switches to OFF position. (3) At the top rear of the battery box, disconnect the battery cable(s). Change 4 4-7

91 (4) At the switchboard rack, use a 7/16-inch wrench to remove four machine screws and remove the front retaining brackets. Retain the hardware for later use. (5) Loosen the top and bottom rack latches and swing the rack out far enough so that the switchboard rear panel cable connections can be reached. (6) Disconnect all cables attached to the rear panel of the switchboard. (7) Unlatch the hold-down retainer strap holding the switchboard in place. (8) Swing the rack back in place and fasten the top and bottom rack latches. (9) Remove the switchboard straight out and free from the rack. b. Replacement. (1) Make necessary switch settings on the rear panel of the switchboard being installed. Be sure front panel POWER switch is in OFF position. (2) At the switchboard rack, place the switchboard fully in the vacant rack space. (3) Loosen the top and bottom rack latches and swing the rack out and away from the front wall. (4) Place the hold-down retainer strap over the switchboard and fasten the hold-down retainer strap latch. (5) Connect all cables to the rear panel of the switchboard. Attach the two signal cables to the upper and lower EXTERNAL TERMINAL CONNECTORS. Next, connect the switchboard interconnecting cable(s) to the SWBD INTCON connector. Fasten the grounding strap securely to the GND binding post. Finally, connect the dc power cable to the DC POWER A connector marked J2. (6) Swing the rack back in place and fasten the top and bottom rack latches. Be careful not to pinch any of the cables. (7) Fasten the front retaining brackets in place with four machine screws removed in step a (4) above. (8) At the top rear of the battery box, connect the battery cable (s). (9) On the front of the PP-6224/U, place the AC and DC switches to the ON positions. (10) Connect headset plug to SB-3614(*) (V)/TT. (11) The SB-3614(*)(V)/TT POWER switch be set to the ON position for operational checks Replacement of Electric Heater a. Removal (1) Set HEAT-OFF-FAN switch to OFF position. (2) Disconnect the heater power plug from the wall receptacle. (3) Remove and retain four 1/4-20 nuts, bolts, and washers holding the heater to its base plate and lift the heater off the base plate. Change TM b. Replacement. (1) Set the heater over the base plate and fasten four nuts, bolts and washers snugly to secure heater in place. (2) Place the HEAT-OFF-FAN switch in OFF position and plug the power cord into the wall receptacle. (3) Operate the switch and heat control to check heater and fan operation Replacement of Telephone Set TA-312/PT a. Removal (1) At the TA-312/PT LINE 1 and 2 binding posts, disconnect the signal. lines coming from the curbside SIGNAL WIRING DUCT. (2) On the right side of the telephone mounting bracket, use a cross tip screwdriver to remove a 1/4-20 flat head machine screw. Retain the screw. (3) Remove the TA-312/PT and the retainer plate from the mounting bracket. Set the retainer plate aside, along with the screw. b. Replacement. (1) Hold the retainer plate, between the screw heads, in the recess on the right side of the TA-312/PT. Slide the TA-312/PT and the retainer plate into the mounting bracket. (2) Align the hole in the retainer plate with the mounting bracket hole. Replace the flat head screw removed in step a (2) above. This secures the telephone in its mounting bracket. (3) Connect signals lines. Push in on the binding post head, insert the bare wire ends in the side of the binding post, release pressure. Be sure that wire ends are clamped tightly Replacement of Telephone Set, Pushbutton TA-938/G a. Removal (1) Under the TA-938/G support shelf, loosen screws and disconnect four wires of the TA-938/G line cord from the terminal block. Note wire color codes and terminal block markings as wires are removed. (2) Rotate the turn button fastener to release the hold-down strap over the TA-938/G. (3) Remove the TA-938/G from its supporting shelf. b. Replacement. (1) Put the replacement TA-938/G on its supporting shelf. (2) Fasten the hold-down strap over the TA- 938/G to hold it on the shelf. (3) Connect the color-coded wires of the line cord to the terminal block under the supporting shelf. The yellow wire goes to terminal Y2; red to R1; green to G3 and the black wire to B4.

92 4-15. Replacement of Intercommunication Station LS-147F/FI a. Removal (1) Turn the LS-147/FI off by turning SEND control fully counterclockwise. (2) Disconnect the ac power cord from the INTERCOM receptacle on the curbside POWER WIRING DUCT AC. (3) On the top, backside of the LS-147F/FI, disconnect the signal lines from the binding posts. Push in on the binding post heads to release the wires. (4) Remove and retain four screws, washers and nuts which secure the LS-147F/FI to the folding desk support bracket. (5) Remove the LS-147F/FI. b. Replacement. (1) Place the LS-147( )/FI on the desk with the mounting flange holes over the holes in the folding desk support bracket. Fasten the intercom in place with hardware retained in step a (4) above. (2) Connect signal lines to the binding posts. Push in on the heads of the posts, insert the bare wire ends into holes on the sides of the posts, release pressure on heads. (3) Be sure unit is turned off. Plug power cord cap into the curbside INTERCOM receptacle. (4) Rotate the SEND control clockwise to midpoint range. Observe that pilot lamp is glowing. Make operational checks Replacement of Air Conditioner CAUTION The lifting or lowering of this air conditioning unit is a two-man job. It weighs 151 pounds. So get an assistant. Watch your hands. a. Removal. (1) Turn air conditioner off. (2) Disconnect air conditioner power cord from the wall receptacle. (3) Slide the plastic cup on the end of the FRESH AIR DAMPER chain back onto the chain. Remove and retain the metal cup from the end of the chain. Slide the plastic cup off of the chain and retain. (4) Remove and retain the four wing-nuts which hold the grill to the rear wall. Slide the chain through the guide and free of the grill. (5) On the outside of the shelter remove and retain the hardware which holds the four long side mounting bars to the rear mounting bars. (6) Remove and retain the two rear and four side mounting bars. (7) Remove the air conditioner. It is heavy. b. If a replacement air conditioner is not available, remove and retain the air conditioner mount from the shelter. Retain the mount and all hardware. Remove the air conditioner access cover plate from the front of the shelter and secure in place over the air conditioner access hole. c. Thread the chain through the guide on the grill, replace the plastic and metal cups on the chain and secure the grill to the defective air conditioner. d. If a replacement air conditioner is available, prepare it for installation by removing the metal and plastic chain cups and the grill. Retain the grill hardware. e. Replacement. (1) Lift the replacement air conditioner onto the mount. Slide it forward snugly against the shelter wall. (2) Insert hooked end of the four long side mounting bars into the slots in the air conditioner mount. (3) Secure the two rear mounting bars in place using the four side mounting bars and the hardware retained in a (5) above. Make sure the nuts are tightened evenly and securely. The air conditioner should fit tightly against the shelter to prevent water leaks. If necessary, adjust the length of the long side mounting bars with the turn buckle arrangement. (4) Thread the chain through the chain guide on the grill and secure the grill to the inside of the shelter with the four wing nuts. (5) Replace the plastic and metal cups onto the chain. (6) Connect the air conditioner power cord to the wall receptacle. (7) Place the air conditioner into operation Replacement of Shelter Blower a. Removal (1) Turn off the blower and disconnect the power cord. (2) Remove the front cover from the blower box by removing the 12 bolts which hold it in place. Retain the hardware. (3) Disconnect the air duct. (4) Remove the blower box from the outside front wall of the shelter by removing the 12 bolts which hold it in place. Retain the hardware. (5) Remove and retain the four nuts which hold the blower motor assembly in place. (6) Remove the blower motor assembly carefully. The power cord will thread out from the inside of the shelter. b. Replacement. (1) Pass the power cord through the exhaust hole and into the shelter. (2) Mount the blower motor assembly in place using the hardware retained in a (5) above. Be sure the blower exhausts downward. 4-9

93 (3) Secure the blower box to the outside of the shelter with the hardware retained in a (4) above. Tighten all bolts evenly and snugly to ensure a watertight seal. (4) Reconnect the air duct. (5) Secure the front cover to the blower box with the hardware retained in a (2) above. Tighten all bolts evenly and snugly to ensure a watertight seal. (6) Connect the blower power cord to the ceiling receptacle. (7) Return the blower to operation Replacement of Battery Box Blower Motor a. Removal (1) If an electric heater is installed on the top of the battery box, remove the electric heater (para 4-12) (2) At the POWER DISTRIBUTION BOX, set PWR SUP circuit breaker to OFF. This will cause switchboard(s) to run on battery power. (3) On the top of the battery box, set both circuit breaker switches to the OFF position. (4) On the top of the battery box, near the roadside wall, is the blower motor. Remove and retain four 6-32 Phillips head machine screws and lift off the motor cover. Set aside as far as the power wires will allow. (5) Pull back the rubber boot over the wires going to the motor electrical terminals. (6) Use a mall (1/8-inch tip) straight blade screwdriver to loosen three 5-40 machine screws and disconnect the power wires from the motor. Disconnect the black wire from terminal number 1; the white wire from terminal number 2 and the green wire attached to the motor case, refer t o figure 4-1. (7) Use a small screwdriver to loosen the hose clamp holding the flexible exhaust tube to the motor. Slip the clamp and hose away from the motor. (8) Remove and retain four 6-32 Phillips head screws which secure the motor base plate to the top of the battery box. Remove and retain the rectangular gasket between the base plate and the battery box. The motor can now be hand-held to remove the last four items from the motor. (9) Remove and retain three 6-32 Phillips head screws holding the base plate to the motor. Retain the round gasket between the plate and the motor. (10) Remove and retain four 6-32 screws holding hose plate and its gasket to the motor. Figure 4-1. Ac terminal connections for battery boxes blower motor. 4-10

94 b. Replacement. (1) Mount the hose plate and gasket to the motor with the four screws retained in step a (10) above. (2) Mount the base plate and round gasket to the motor with the three screws retained in step a (9) above. (3) Secure the motor and base plate, plus the rectangular gasket, to the top of the battery box with the four screws retained in step a (8) above. (4) Slip the hose and its clamp over the motor hose plate and tighten the clamp snugly. (5) Reconnect the ac power wires according to the diagram in Figure 4-1. (6) Replace the rubber boot over the terminals. (7) Replace the motor cover and fasten it to the battery box with the four screws retained in step a (4) above. (8) If an electric heater was removed from the top of the battery box, replace the heater (para 4-12) (9) At the POWER DISTRIBUTION BOX set the PWR SUP circuit breaker switch to the ON position. The blower motor should operate. (10) At the PP-6224/U, adjust the DC OUTPUT voltage to the desired level for charging batteries. (11) Turn the battery box switches to ON position for recharging batteries Replacement of Storage Batteries (BB-501 or BB-297) a. Removal (1) On the top of the battery box, set BATT 1 and BATT 2 circuit breaker switches to OFF position. (2) On the top of the battery box, at the roadside rear corner, disconnect one or two dc power cable connectors. This removes the dc power coming from the PP-6224/U. (3) Unfasten 12 retaining fasteners on the vertical front panel of the battery box. Pull the battery tray out on the slide assembly. (4) Disconnect the battery cables at the battery posts and move cables aside. Refer to figures 2-2 or 2-3. (5) Use a 7/16-inch wrench to remove four nuts and washers securing the battery top retainer to four vertical hold-down bolts. Lift the battery top retainer off the four bolts. (6) Carefully, lift battery straight up and out of the battery tray. b. Replacement of Battery (BB-501 or BB-297). WARNING Before changing from one type of storage battery to another, a complete cleaning (decontamination) 4-11 TM of the entire battery box and associated tools is required. That is, when changing from use of a BB-297 (leadacid) to a BB-501 (nickel-cadmium) or the reverse order from BB-501 to BB For decontamination procedures refer to paragraph Also, refer to WARNINGS in TM (1) Before setting a battery in place on the battery tray, be sure that the positive battery terminal is nearest the front wall of the shelter and the negative terminal is toward the rear wall. If installing two replacement batteries, first place BATTERY NO. 2 in the tray position nearest the roadside wall. (2) Place the battery top retainer over the batteries and the four vertical hold-down bolts. (3) Replace washers and nuts removed in step a (5) above. Tighten nuts evenly so that the battery top retainer is just snug against the top edge of the batteries. Turn nuts finger tight and add 1/2-turn with a wrench. (4) Connect and tighten battery cables to the battery positive and negative terminals. Remember, the batteries and tray will be pushed into the battery box. So position the cables and their connectors on the battery terminals so that they will be under minimum tension when inside the battery box. Be sure connections are made as shown in figures 2-2 or 2-3, according to the type of battery being installed. (5) Slowly, slide the battery tray fully into the battery box. Fasten the 12 fasteners on the vertical front panel to battery box Decontamination Procedure for Battery Box and Tools a. When changing from BB-297, lead-acid batteries to BB-501, nickel-cadmium batteries, proceed as follows: (1) Prepare a solution of common wash detergent in warm water. A quarter of a cupful to a gallon of water will do. Stir thoroughly. (2) Wet a clean sponge or cloth in the soapy solution and clean all the surfaces of the battery box. Wipe cables, connectors, terminal strips, clamps, battery tray, all hardware, everything. Be thorough. Clean all tools that have been used with the BB-297. (3) Prepare a mild rinse solution of ammonia in warm water. Rinse the soapy water out of the sponge or cloth. Dampen the sponge or cloth in the ammonia solution. Then rinse off all surfaces previously cleaned with the detergent solution. (4) Dry off excess ammonia solution droplets with a dry, lint-free cloth. Drying may be speeded by using an air pressure hose not exceeding 30 psi or an electric heater.

95 b. When changing from BB-501, nickel-cadmium batteries to BB-297, lead-acid batteries, use the following procedure: (1) Prepare a detergent solution and clean all elements of the battery box and tools as specified in steps a (1) and (2) above. (2) Prepare a mild rinse solution of vinegar in warm water. Rinse all surfaces cleaned earlier with the detergent solution. (3) Dry everything thoroughly before installing the replacement batteries Replacement of Headset Switchbox a. Removal (1) At the headset switchbox, disconnect the two switchboard cables. One cable is attached to SWBD NO. 1 in the right-hand stack. The second cable is attached to SWBD NO. 4 in the left-hand stack. (2) At the switchbox, disconnect the operator s headset cord. (3) Loosen the two 1/4-20 captive screw fasteners holding the switchbox to the operator s desk. Remove the headset switchbox. b. Replacement. (1) Set the replacement headset switchbox in place on the operator s switchbox in place on the operator s desk. Secure it to the desk with the two 1/4-20 captive screw fasteners. (2) Connect cables. The cable from SWBD NO. 1 is connected at the switchbox at a connector labeled SWBD-R. The cable from SWBD NO. 4 goes to SWBD-L. The operator s headset cord, is attached at the HEADSET connector Testing of Power Cables, CX-7705A/U or CX- 7453A/U If either of the power cables in use is suspected of fault or failure, test as follows: a. At the POWER DISTRIBUTION BOX, place the MAIN circuit breaker to the OFF position. This will cut off all ac power to the facility. The switchboards will run on dc power from the storage batteries. b. Disconnect both ends of the external power cable. c. Inspect the cable for apparent damage. Inspect the connectors for cracks or signs of abuse. d. Use an ohmmeter to check for continuity on each end of each conductor; pin 1 to pin 1, pin 2 to pin 2 and pin 4 to pin 4. There should be continuity. Resistance should not exceed 1 ohm. If resistance is high or infinite, get a replacement and turn the faulty cable over to direct support for repair. e. At one end of the cable, check to see that there is no continuity between any of the conductors. There should not be any reading on the ohmmeter scale. If continuity or any resistance is noted, the cable is defective. 4-12

96 CHAPTER 5 INSTALLATION KIT MK-1885/TTC-41(V) Section I. INTRODUCTION 5-1. Scope This chapter covers Installation Kit MK-1885/TTC-41(V). It provides descriptions, installation and operation instructions and general maintenance information on the equipment. The MK-1885/TTC-41(V) is commonly referred to as a dismount kit Purpose and Use The MK-1885/TTC-41(V) consists of the items required to support the operation of a single Switchboard SB- 3614(*)(V)/TT removed from a Central Office, Telephone AN/TTC-41(V). By using the dismount Kit, a dismounted SB-3614(*)(V)/TT can be used to maintain essential operations while the parent AN/TTC-41(V) is moved to another location. After the move is completed, the SB- 3614(*)(V)/TT can be returned to the parent AN/TTC- 41(V). A dismounted SB-3614(*)(V)/TTC and a dismount kit may also be used to provide an additional operators location, if required Description a. Components. The designation Installation Kit MK-1885/TTC-41(V) covers a total of 18 components. These may be requisitioned separately, or the entire kit may be requisitioned as a unit. The items comprising an MK-1885/TTC-41(V) are listed in table 5-1. Figure 5-1 shows the components in an unassembled group. The figure also includes a set of spare modules and an SB- 8614/TT. These are not supplied with the kit but are included here for continuity and scale purposes. Not shown, but also required is a 500-watt, 60 Hz ac generator. This must be requisitioned separately. b. System Application and Compatible Equipment. A dismounted SB-3614(*)(V)/TT, use in conjunction with this dismount kit, is capable of operation in the same telephone network and with the same types of subscribers as the parent AN/TTC-41 (V). Refer to chapter 1 for further details concerning compatible equipment and network configurations Movement of the MK-1885/TTC-41(V) WARNING When loaded for transport, the large carrying case weighs over 60 pounds, and is cumbersome to handle. Use two persons to carry the case. a. Moving the Basic Kit. The basic kit, without a switchboard or spare PCB s is transported in Table 5-1. Installation Kit MK-1885/TTC-41(V) Components Index No. Item Number Weight (lbs) 1 Power Supply PP-2953(*)/G Storage Battery BB Case (Spare Cord) A Case (for items 11, 12, 13) SC-D Power Cable SC-D Power Cable SC-D Ground Rod Ground Strap Headset H-182/PT Terminal Box (for switchboard) Ac power cable (75 ft.) SC-D Front Cover, Switchboard Rear Cover, Switchboard Change 4 5-1

97 Figure 5-1. Installation Kit MK-1885/TTC-41(V), Components EL5SH029