DOT MATRIX PRINTER LC-8521 TECHNICAL MANUAL [ THIRD EDITION ]

Transcription

1 DOT MATRIX PRINTER LC-8521 TECHNICAL MANUAL [ THIRD EDITION ]

2 NOTICE All rights reserved. Reproduction of any part of this manual in any form whatsoever, without STAR s express permission is forbidden. The contents of this manual are subject to change without notice. All efforts have been made to ensure the accuracy of the contents of this manual at the time of going to press. However, should any errors be detected, STAR would greatly appreciate being informed of them. The above notwithstanding, STAR can assume no responsibility for any errors in this manual. Copyright 1997 Star Micronics Co.,Ltd.

3 INTRODUCTION This manual describes the LC-8521 dot matrix printer. It is designed for use as a reference for periodic inspections and maintenance procedures to be executed by service personnel. It is not intended for the general user. Users of this manual should have a basic knowledge and understanding of the English language. 1 2 This manual is divided into the following sections: Chapter 1 General Specifications Chapter 2 Theory of Operation Chapter 3 Adjustments Chapter 4 Parts Replacement Chapter 5 Maintenance and Lubrication Chapter 6 Troubleshooting Chapter 7 Parts List First edition : Mar Second edition : Aug Third edition : Nov

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5 CHAPTER 1 GENERAL SPECIFICATIONS 1 1. General Spaecifications External Appearance and Composition Control Panel Switch Combination Functions EDS Mode Settings Parallel Interface General Specifications Connector Signals Serial Interface General Specifications Connector Signals and Functional Descriptions Serial Interface - SPC-8K (Option) General Specifications Connector Signals and Functional Descriptions DIP Switch Settings EE-PROM Mode Outline Explanation of Special Control Codes EE-PROM Map Rewriting the EE-PROM... 19

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7 1. General Specifications Printing System Serial Impact Dot-Matrix Printing Speed Pitch HS-Draft (cps/dpi) Draft (cps/dpi) LQ (cps/dpi) Pica (10 cpi) 400/80H 300/120H 100/360H Elite (12 cpi) 360/120H 120/360H Semi-condensed (15 cpi (S)) 450/120H 150/360H Semi-condensed (15 cpi (I)) 212/240H 150/360H Condensed pica (17 cpi) 242/240H 171/360H Condensed elite (20 cpi) 283/240H 200/360H 24 cpi (I) 340/240H 240/360H H: half-dot (S): Standard mode only (I): IBM mode only Print Direction Draft: Bi-directional logic seeking LQ: Bi-directional logic seeking Bit-Image: Uni-directional/bi-directional logic seeking (selectable) Print Head Number of pins: 24 Life: 200 million dots/pin (adjustment lever position 1 to 3) 100 million dots/pin (adjustment lever position 4 to 8) Line Spacing 1/6, 1/8 7/60, 7/72, n/72, n/180, n/216, n/360 : software Character Matrix Pitch HS-Draft Draft LQ Pica (10 cpi) 24 7Η 24 9H 24 31H Elite (12 cpi) 24 9H 24 27H Semi-condensed (15 cpi(s)) 16 7H 16 21H Semi-condensed (15 cpi(i)) 24 9H 24 16H Condensed pica (17 cpi) 24 9H 24 16H Condensed elite (20 cpi) 24 9H 24 16H 24 cpi (I) 24 9H 24 14H H: half-dot (S): Standard mode only (I): IBM mode only Environment Operating temperature: 41 F to 95 F (5 C to 35 C) Storage temperature: -22 F to 149 F (-30 C to 65 C) Operating humidity: 30% to 80% (noncondensing) Storage humidity: 20% to 90% (noncondensing) Paper Cut-sheet Paper width: 2 to 16.5 / 51 to 420 mm Paper length: 2.75 to 14 / 70 to 356 mm Paper weight (1-ply): 14 to 42 lbs / 52 to 156 g/m 2 / 45 to 135 kg Multi-part: 11 to 14 lbs / 40 to 52 g/m 2 / 34 to 45 kg; pressure sensitive paper Total thickness: /0.35mm Copies: Original + 4 3

8 Fanfold Paper width: 3 to 16 / 76 to 406mm Paper length 6 / 152mm(min.) Paper weight (1-ply): 14 to 22 lbs / 52 to 82 g/m 2 / 45 to 70 kg Multi-part: 11 to 14 lbs / 40 to 52 g/m 2 / 34 to 45 kg; pressure sensitive paper Total thickness: / 0.35mm Copies: Original + 4 Labels Backing sheet: 3 to 16 / 76 to 406mm Thickness: Backing sheet to / 0.07 to 0.09mm Total thickness / 0.19mm max. Envelope # / mm # / mm Emulation Standard Mode: EPSON ESC/P (24-pin) NEC Graphic Compatible IBM Mode: Proprinter XL24E Interface Standard: Centronics parallel RS-232C serial Ribbon Type On-carriage, dedicated Monochrome: Black only LZ24HD (Standard) Ribbon Life LZ24HD: 4million characters (ASCII Draft) Power Supply 110V AC +20%/-18%, 230V AC +14%/-13%; 50/60Hz (depending on country of purchase) Power Consumption 17W during stand-by 63W during ASCII draft printing Options SPC-8K Serial-To-Parallel Converter CT-15HA Push Tractor Unit 240mm 9.5" 650mm 25.6" Weight: 28.7lbs/13kg 333mm 13.1" Fig. 1-1 External dimensions 4

9 2. External Appearance and Composition Front cover Adjustment lever Release lever Paper guide Power switch Document table Control panel Platen knob Fig. 1-2 Front view of the Printer Parallel Interface connector Serial Interface connector Fig. 1-3 Rear view of the Printer 5

10 Ribbon Cartridge Gap Adjustment assy Paper Feed Roller Print Head Platen Fig. 1-4 Front cover removed Tractor Carriage Paper Feed Motor Carriage Motor Ribbon Holder Printer Mechanism Power Supply Unit Main Logic Board Control Panel Board Fig. 1-5 Diagram of internal layout 6

11 3. Control Panel 3-1. Switch Combination Functions HS-DRAFT DRAFT BANK SW ROMAN SANSERIF A 1 D 4 COURIER PRESTIGE B 2 E 5 ORATOR C 3 F 6 10 CPI 12 CPI 15 CPI COND PROP POWER FONT PITCH PARK SET/EJECT PAPER FEED ON LINE BANK SW ON/OFF EDS PRINT EXIT Font Selection Pitch Selection Set/Eject/Park Line Feed On-Line Panel Macro Form Feed Back ward Forward Micro Feed Set TOF Auto Loading Position Change Mode Buffer Clear & All Reset OFF-LINE Quiet Mode Tear off Off-Line ON-LINE Font Lock Pitch Lock Multi-part Mode Long Test Short Test Font & Pitch Lock Hex Dump Mode EDS-2 Mode EDS-1 Mode Dot-Adjustment Mode Aging mode Test EEPROM Data Initialize POWER-ON Bank Switch On/Off Print Exit EDS MODE Left Right Next Exit DOT-ADJUSTMENT MODE Paper Loading Back ward Forward Cancel Set Save Factory settings AUTO LOADING POSITION CHANGE MODE 7

12 3-2. EDS Mode Settings (EDS - 1) Bank Switch Function ON OFF A 1 Emulation *Standard / EPSON IBM 2 Character Table (CT) Standard / EPSON mode *Graphics Italics IBM mode IBM #2 IBM #1 3 RAM usage *Input Buffer Download Buffer 4 Paper Out Detector *Enabled Disabled 5,6 Multi-part mode * Auto selectable ON ON Normal mode ON OFF Multi-part mode OFF ON B 1 Graphics Direction *Bi-directional Uni-directional 2 Auto Tear-off (Long) *Disabled Enabled 3 Line Spacing *1/6 1/8 4 Auto LF with CR *Disabled Enabled 5 Zero Style *Normal Slashed 6 Strobe Timing *Normal Reveres C 1, 2 Print Mode * LQ ON ON HS-Draft ON OFF Draft OFF ON 3,4,5 Print Pitch * 10cpi ON ON ON 17cpi OFF OFF ON 12cpi OFF ON ON 20cpi ON ON OFF 15cpi ON OFF ON Proportional OFF ON OFF 6 Quiet *Disabled Enabled D 1,2,3,4 Page Length *11 /Letter ON ON ON ON 14 /Legal OFF ON OFF ON 8 OFF ON ON ON 10.5 /Executive ON OFF OFF ON 11.7 /A4 ON OFF ON ON 7.25 /Executive OFF OFF OFF ON 12 OFF OFF ON ON 3.5 ON ON ON OFF 8.5 /Letter ON ON OFF ON 5.5 OFF ON ON OFF 5 Eject direction for cut sheet *Front Rear 6 Skew sensor for cut sheet *Disabled Enabled E 1, 2, 3, 4, 5, 6 Code Page (CT=Graphics, IBM #1, #2) * #437 ON ON ON ON ON ON #869 OFF OFF ON ON OFF ON #850 OFF ON ON ON ON ON #928 ON ON OFF ON OFF ON #860 ON OFF ON ON ON ON #2001 OFF ON OFF ON OFF ON #861 OFF OFF ON ON ON ON #772 ON OFF OFF ON OFF ON #863 ON ON OFF ON ON ON #774 OFF OFF OFF ON OFF ON #865 OFF ON OFF ON ON ON #3001 ON ON ON OFF OFF ON #866 ON OFF OFF ON ON ON #3002 OFF ON ON OFF OFF ON #3840 OFF OFF OFF ON ON ON #3011 ON OFF ON OFF OFF ON #3841 ON ON ON OFF ON ON #3012 OFF OFF ON OFF OFF ON #3843 OFF ON ON OFF ON ON #3021 ON ON OFF OFF OFF ON #3844 ON OFF ON OFF ON ON #3031 OFF ON OFF OFF OFF ON #3845 OFF OFF ON OFF ON ON #3041 ON OFF OFF OFF OFF ON #3846 ON ON OFF OFF ON ON #3850 OFF OFF OFF OFF OFF ON #3847 OFF ON OFF OFF ON ON #3860 ON ON ON ON ON OFF #3848 ON OFF OFF OFF ON ON #3861 OFF ON ON ON ON OFF #852 OFF OFF OFF OFF ON ON #3863 ON OFF ON ON ON OFF #1001 ON ON ON ON OFF ON #3864 OFF OFF ON ON ON OFF #737 OFF ON ON ON OFF ON #3865 ON ON OFF ON ON OFF #851 ON OFF ON ON OFF ON International Character Set (CT=Italics) U.S.A. ON ON ON ON ON ON Japan ON ON ON OFF ON ON France OFF ON ON ON ON ON Norway OFF ON ON OFF ON ON Germany ON OFF ON ON ON ON Denmark-2 ON OFF ON OFF ON ON England OFF OFF ON ON ON ON Spain-2 OFF OFF ON OFF ON ON Denmark-1 ON ON OFF ON ON ON Latin America ON ON OFF OFF ON ON Sweden OFF ON OFF ON ON ON Korea OFF ON OFF OFF ON ON Italy ON OFF OFF ON ON ON Ireland ON OFF OFF OFF ON ON Spain-1 OFF OFF OFF ON ON ON Legal OFF OFF OFF OFF ON ON F 1, 2, 3, 4, 5, 6 LQ Font Selection * Roman ON ON ON ON ON ON Prestige OFF OFF ON ON ON ON Sanserif OFF ON ON ON ON ON OCR B OFF ON OFF ON ON ON Courier ON OFF ON ON ON ON Orator OFF OFF OFF ON ON ON 8 *: Default setting

13 (EDS - 2) Bank Switch Function ON OFF A 1 Data bits *8 bits 7 bits 2 Parity check *Disabled Enabled 3 Parity *Odd Even 4 Protocol *DTR XON / XOFF 5 (Not used) (Not used) B 1 Baud rate * ON OFF ON OFF ON OFF ON OFF 2 ON ON OFF OFF ON ON OFF OFF 3 ON ON ON ON OFF OFF OFF OFF 4 (Not used) ,6 Waiting period for Paper loading * 2.0 ON ON 1.0 ON OFF 1.5 OFF ON 0.5 OFF OFF C 1 Top margin for cut sheet *1/6 0 2 Top margin for Fanfold paper (Rear) *1/6 0 3 Top margin for Fanfold paper (Front) *1/6 0 4 Bottom margin for Cut sheet *1/6 0 5 Bottom margin for Fanfold paper (Rear) *1/6 0 6 Bottom margin for Fanfold paper (Front) *1/6 0 *: Default settings 9

14 4. Parallel Interface 4-1. General Specifications Item Interface Synchronization System I/F Protocol Logic Level Specifications Centronics-compatible Via externally supplied STROBE pulse Using ACK and BUSY signals Compatible with TTL level ACK 4µs 4µs t t t t Data STROBE (EDS B-6 : ON) STROBE (EDS B-6 : OFF) BUSY 4-2. Connector Signals t : More than 0.5µs Fig. 1-6 Timing Charts for Parallel Interface Pin Name Function 1 STROBE Goes low for 0.5µs when active. 2 DATA0 3 DATA1 4 DATA2 5 DATA3 6 DATA4 7 DATA5 8 DATA6 9 DATA7 These signals represent information for the 1st through 8th bit of parallel data, respectively. Each signal is HIGH when data is logical 1, and LOW when logical ACK 10µs low to acknowledge receipt of data. 11 BUSY Printer sets line low when ready to receive data. 12 PAPER High when paper runs out. 13 SELECT High when printer is on-line. 14 AFXT Printer ignores this signal. 15 Not used. 16 SIGNAL GND Signal ground 17 CHASSIS Chassis ground (isolated from signal ground) 18 +5V +5V DC output from printer 19~30 GND Twisted pair ground return 31 RESET Printer is reset when this signal goes low. 32 ERROR Low when printing cannot continue due to error. 33 EXT GND External ground 34~35 Not used 36 SELECT IN Printer ignores this signal. 10

15 5. Serial Interface When using the serial interface, the optional Serial-Parallel Converter must be connected to the printer General Specifications Item Interface Synchronization System Baud rate Word length Start bit: Data bit: Parity bit: Stop bit: Signal polarity Mark: Space: Handshaking Specifications RS-232C level Asynchronous ,200 bits per second (BPS) [selectable] 300, 300, 600, 1200, 2400, 4800, 9600, BPS 1 bit 7 or 8 bits (selectable) Odd, Even or None (selectable) More than 1 bit length Logic 1 ( 3V to 15V) Logic 0 (+3V to +15V) DTR XON/XOFF 5-2. Connector Signal and Functional Descriptions Pin Name Function 1 CHASSIS Printer chassis ground 2 TXD Data from printer 3 RXD Data to printer 4 RTS Always space 5 CTS Space when computer is ready to send data. Printer ignores this signal. 6 Not used. 7 GND Signal ground 8-10 Not used. 11 RCH Printer sets line to space when ready to receive data. Same signal as pin Not used. 13 Not used. (single ground) Not used. 20 DTR Printer sets line to space when ready to receive data Not used. 11

16 6. Serial Interface - SPC-8K (Option) When using the serial interface, the optional Serial-Parallel Converter must be connected to the printer General Specifications Item Interface Synchronization System Baud rate Word length Start bit: Data bit: Parity bit: Stop bit: Signal polarity Mark: Space: Handshaking Data buffer Specifications RS-232C level Asynchronous ,200 bits per second (BPS) [selectable] 150, 300, 600, 1200, 2400, 4800, 9600, BPS 1 bit 7 or 8 bits (selectable) Odd, Even or None (selectable) More than 1 bit length Logic 1 ( 3V to 15V) Logic 0 (+3V to +15V) DTR XON/XOFF ETX/ACK 8KB (standard) 6-2. Connector Signal and Functional Descriptions Pin No. Signal name Direction Function 1 GND Printer chassis ground. 2 TXD OUT This pin carries data from the printer. 3 RXD IN This pin carries data to the printer. 4 RTS OUT Always space. 5 CTS This signal is space when the computer is ready to send data. The printer does not check this pin. 6 NC Unused. 7 GND Signal ground. 8~10 NC Unused. 11 RCH OUT The printer sets this signal to space when it is ready to receive data. This line carries the same signal as pin ~19 NC Unused. 20 DTR OUT The printer sets this signal to space when it is ready to receive data. 21~25 NC Unused. 12

17 6-3. DIP Switch Settings Switch ON OFF 1 8 data bits 7 data bits 2 No parity Parity checked 3 4 Handshaking protocols see table below 5 Odd parity Even parity 6 7 Data transfer rate see table below 8 All switches are set to ON before the printer leaves the factory. Protocol Switch 3 Switch 4 DTR mode ON ON XON/XOFF mode ON OFF ETX/ACK mode OFF ON Baud rate Switch 6 Switch 7 Switch OFF OFF OFF 300 OFF OFF ON 600 OFF ON OFF 1200 OFF ON ON 2400 ON OFF OFF 4800 ON OFF ON 9600 ON ON OFF ON ON ON 13

18 7. EE-PROM mode 7-1. Outline These settings can be changed in the EE-PROM mode by writing data directly to the EE-PROM on the main logic board: Setting EE-PROM mode Send <ESC><SUB>(09)H command. Canceling EE-PROM mode Initialize the printer by sending 7-2. Explanation of special control codes Exits printer from EE-PROM mode and initializes the printer. Returns all data in the EE-PROM to the factory settings. After the buffer is cleared, the buzzer sounds. If the printer is powered off before the buzzer sounds, all data in the buffer is not cleared. If all data is not cleared from the buffer, operation is not guaranteed. Be sure to allow the buzzer to sound before you turn the printer off! <ESC>MWn Code Function Address Capacity <ESC>MW0 <data> Stores data into entire area of EE-PROM. 00H-7FH 128bytes <ESC>MW1nm Stores data (m) into the address (n) nh 1 byte <ESC>MW2<data> Stores auto-start software data into 43H-60H 30bytes EE-PROM. 61H-7DH 29bytes The data (m) used in the commands above are stored in the specified address in order (n). When the data to be stored exceeds the specified capacity, subsequent data are ignored. Data are stored in the EE-PROM according to the memory map. (See section 3. EDS mode setting and 6-3. EE-PROM Map.) After all data are stored, a beep indicates the completion of storage. If the printer is powered off during data storage, data stored before power off are valid, but subsequent operation of the printer is not guaranteed. Do not power off the printer while data is being stored! <ESC>MR Dumps all data in the EE-PROM to a hard copy. For an example of using these control codes, see section 7-4. For the corresponding EE-PROM addresses, see the EE-PROM memory map in section 3-2. EDS mode setting and 7-3. EE-PROM Map. 14

19 7-3. EE-PROM Map Address Function Factory data 00H EDS setting FFH Bit Function 1 0 b0 Emulation STANDARD/EPSON IBM Character Table b1 Standard / EPSON mode Graphics Italics IBM mode IBM #2 IBM #1 b2 RAM Usage Input Buffer Download Buffer b3 Paper out Detector Enabled Disabled Multi-part mode Function b4 b5 Auto selectable 1 1 Multi-part mode 0 1 Normal mode H EDS setting FFH Bit Function 1 0 b0 Graphics Direction Bi-directional Uni-directional b1 Tear-off Disabled Enabled b2 Line Spacing 1/6 1/8 b3 Auto LF with CR Disabled Enabled b4 Zero Style Normal Slashed b5 Strobe Timing Normal Reverse 02H EDS setting FFH Print Mode Print Pitch Function b0 b1 Function b2 b3 b4 LQ cpi Draft cpi HS-Draft cpi cpi cpi Proportional Bit Function 1 0 b5 Quiet Disabled Enabled 03H EDS setting FFH Page Length Function b0 b1 b2 b3 Function b0 b1 b2 b3 11 /Letter /Legal /Executive /A /Executive /Letter

20 03H EDS setting FFH Bit Function 1 0 b4 Eject direction for cut sheet Front Rear b5 Skew sensor for cut sheet Disabled Enabled 04H EDS setting FFH IBM Code Page (Character Table=Graphics, IBM#1, #2) Function b0 b1 b2 b3 b4 b5 Function b0 b1 b2 b3 b4 b5 # # # # # # # # # # # # # # # # # # # International Character Set (Character Table=Italics) Function b0 b1 b2 b3 b4 b5 U.S.A France Germany England Denmark Sweden Italy Spain # # # # # # # # # # # # # # # # # # Function b0 b1 b2 b3 b4 b5 Japan Norway Denmark Spain Latin America Korea Ireland Legal H EDS setting FFH LQ Font Selection Function b0 b1 b2 b3 b4 b5 Roman Sanserif Courier Function b0 b1 b2 b3 b4 b5 Prestige OCR B Orator H EDS setting FFH Bit Function 1 0 b0 Data bits 8bits 7bits b1 Parity check Disabled Enabled b2 Parity Odd Even b3 Protocol DTR XON / XOFF 16

21 Address Function Factory data 07H EDS setting FDH Baud rate Function b0 b1 b Function b0 b1 b Waiting Period for Paper loding Function b4 b5 2.0sec sec 0 1 Function b4 b5 1.0sec sec H EDS setting FFH Bit Function 1 0 b0 Top margin for Cut sheet 1/6 0 b1 Top margin for Fanfold paper (Pear) 1/6 0 b2 Top margin for Fanfold paper (Front) 1/6 0 b3 Bottom margin for Cut sheet 1/6 0 b4 Bottom margin for Fanfold paper (Rear) 1/6 0 b5 Bottom margin for Fanfold paper (Front) 1/6 0 09H Misalignment correction normal 60DPI (F) 80H 0AH Misalignment correction normal 80DPI (H) 80H 0BH Misalignment correction normal 80DPI (F) 80H 0CH Misalignment correction normal 120 DPI (H) Text 80H 0DH Misalignment correction normal 120 DPI (H) Bit-image 80H 0EH Misalignment correction normal 120 DPI (F) 80H 0FH Misalignment correction normal 180 DPI (H) 80H 10H Misalignment correction normal 180 DPI (F) Text 80H 11H Misalignment correction normal 180 DPI (F) Bit-image 80H 12H Misalignment correction normal 240 DPI (H) 80H 13H Misalignment correction normal 360 DPI (H) Text 80H 14H Misalignment correction normal 360 DPI (H) Bit-image 80H 15H Misalignment correction multi-part 60 DPI (F) 80H 16H Misalignment correction multi-part 80 DPI (H) 80H 17H Misalignment correction multi-part 80 DPI (F) 80H 18H Misalignment correction multi-part 120 DPI (H) Text 80H 19H Misalignment correction multi-part 120 DPI (H) Bit-image 80H 1AH Misalignment correction multi-part 120 DPI (F) 80H 1BH Misalignment correction multi-part 180 DPI (H) 80H 1CH Misalignment correction multi-part 180 DPI (F) Text 80H 1DH Misalignment correction multi-part 180 DPI (F) Bit-image 80H 1EH Misalignment correction multi-part 240 DPI (H) 80H 1FH Misalignment correction multi-part 360 DPI (H) Text 80H 20H Misalignment correction multi-part 360 DPI (H) Bit-image 80H 21H Misalignment correction half-dot H 22H Misalignment correction half-dot 80 DPI (H) 80H 23H Misalignment correction half-dot H 17

22 Address Function Factory data 24H Misalignment correction half-dot 120 DPI (H) Text 80H 25H Misalignment correction half-dot 120 DPI (H) Bit-image 80H 26H Misalignment correction half-dot H 27H Misalignment correction half-dot 180 DPI (H) 80H 28H Misalignment correction half-dot H 29H Misalignment correction half-dot H 2AH Misalignment correction half-dot 240 DPI (H) 80H 2BH Misalignment correction half-dot 360 DPI (H) Text 80H 2CH Misalignment correction half-dot 360 DPI (H) Bit-image 80H 2DH,2EH Top margin in auto-loading for rear tractor mode 00H, 00H 2FH,30H Top margin in auto-loading for front tractor mode 00H, 00H 31H,32H Top margin in auto-loading for friction mode 00H, 00H 33H Paper end sensor A/D value (for carriage) 75H 34H Paper end sensor A.D value (for paper set) 75H 35H~38H Macro Set EPSON 00H - 00H 39H~3CH Macro Set IBM 00H - 00H 3DH,3EH Tear off length (Short) 00H, 80H 3FH,40H Tear - off length (Long) 00H, 80H 41H,42H Initial Condition area FFH, FFH 43H~60H Auto Start area EPSON (30 byte) 00H - 00H 61H~7DH Auto Start area IBM (29 byte) 00H - 00H 7EH FF Control Code (Space 00H / Null 0FH) 00H 7FH Check code 10H 18

23 7-4. Rewriting the EE-PROM Follow this procedure to rewrite the EE-PROM. (1) Turn the printer on. (2) Load a BASIC disk in the computer. (3) Turn the computer on. (4) Set a sheet of paper in the printer, and press the ON LINE switch. (5) Enter the program listed below and run the program. 10 LPRINT CHR$(27);CHR$(26);CHR$(&H09) 20 LPRINT CHR$(27); MW1 ;CHR$(&H01);CHR$(&HFB) 30 LPRINT CHR$(27); MR BASIC Program Code What It Does 10 LPRINT CHR$(27);CHR$(26);CHR$(&H09) Enters the EE-PROM mode. 20 LPRINT CHR$(27); MW1 ; Starts rewriting the EE-PROM. CHR$(&H01); Address data from &H01 will show EDS mode from the EE-PROM memory map. CHR$(&HFB) Data from &HFB will change the Line spacing from 1/6 to 1/8. 30 LPRINT CHR$(27); MR Dumps all EE-PROM data to hexadecimal. (6) To complete the setting, turn the printer off. 19

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25 CHAPTER 2 THEORY OF OPERATION 1. Block Diagram General Flow Chart (Main Logic Board) Power Supply Circuit Mechanisms Print Head Mechanism Character Mechanism Print Wire Drive Operation Print Head Carrying Mechanism Ink Ribbon Feed Mechanism Paper Feed Mechanism Detectors

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27 1. Block Diagram The block diagram of this printer is shown in Fig Data (From Host Computer) Print head Parallel interface Driver Carriage motor LED Switch Control panel board Masked ROM 8M UVE-PROM 1M Gate array CPU Paper feed motor Detectors Power supply unit EE-PROM RAM AC Power Main logic board Printer mechanism Fig. 2-1 Block Diagram (1) Main Logic Board This board receives data from the host computer and stores it in the RAM in the order it arrives. The CPU on this board reads the data from the RAM, and edits it according to the program stored in the ROM. When editing is completed, various drive signals from the CPU are sent to the printer mechanism to perform printing. Explanation CPU TMP95C061BEF Controls this printer. UVE-PROM 1M bit Contains the program which executes control of the printer. UVE-PROM is not provided with some versions of the software. Masked ROM 8M bit Contains the character font. EE-PROM KM93C bits Contains the data (EDS data and so on) in the memory switch. RAM 1M bit Used as a stack area, work area and data buffer of the CPU. Parallel interface Gate array (custom IC) Inputs/outputs several signals. Driver The data edited by the CPU and gate array are sent to the printer mechanism after conversion to the signal for the print head drive and motor drives. (2) Control panel board Panel circuit for manual control of the printer. (3) Printer Mechanism Consists of a print head, carriage motor, paper feed motor, and detectors. (4) Power Supply Unit Converts AC power to 40VDC and 5VDC. 23

28 2. General Flow Chart (Main Logic Board) The flow chart below shows you the general flow of editing and printing operations. Fig. 2-2 General Flow Chart of Editing and Printing 24

29 3. Power Supply Circuit A ringing choke converter type circuit is used with a dropper type circuit in the power supply unit, fulfilling the input and output conditions described in the chart below. Input Output Voltage Range Max. Current Output Service Circuit Type 100 to 120VAC 2.5 A 220 to 240VAC 1.3 A 5 VDC ±5% 0.3 A For logic circuit Dropper drive, for motor holding. 40 VDC ±5% 3.3A For print head Ringing choke drive, for motor drive. converter. Input 100VAC 110VAC 220VAC 230VAC 240VAC Noise filter circuit Switching section (Transistor Q1) In rush current protection circuit Ringing choke converter Rectifier circuit Voltage auto select circuit Output 40V DC Dropper circuit Output 5V DC Transformer T1 Control circuit PC1 Voltage reference Photo-Coupler Fig. 2-3 Power Supply unit block diagram 25

30 4. Mechanism 4-1. Print Head Mechanism Character Mechanism The wiring arrangement of the guide section on the print head styles is depicted in Fig Odd- and even-numbered wires are arranged it two columns. This is a result of the necessity for laying adjacent dots on top of one another. Fig. 2-4 Wiring Arrangement Print Wire Drive Operation The print head consists of 24 needle wires and 24 print solenoids. The following explains how each needle wire operates during printing. (1) When the print solenoid is energized, the clapper is attracted by the iron core and the needle wire is driven toward the platen. (2) This needle wire hits the platen via the ink ribbon and paper. A single dot is printed on the paper. (3) When the print solenoid is de-energized, the needle wire is returned to its original position by rebound energy and spring and clapper holder (leaf spring) force. Fig. 2-5 Outline of Print Head Mechanism 26

31 4-2. Print Head Carrying Mechanism The print head carrying mechanism consists of a carriage, timing belt, carriage motor, and home position detector. Carriage The carriage is supported horizontally by the carriage stay and rear angle. The carriage moves from side to side with the print head mounted above it. A timing belt is clamped to the base of the carriage and a shield plate is mounted at the base for home position detection. Timing Belt The timing belt is suspended between the timing pulley of the carriage motor and the timing pulley of the tension lever. The timing belt maintains a constant tension. The timing belt is also clamped to the base of the carriage so that it can move the carriage accurately with driving force from the carriage motor. Carriage Motor The carriage motor is a HB (Hybrid) 4-phase, 200-pole pulse motor driven by pulse signals from the control circuit. The rotational rate depends on the number of pulses per unit time. By varying this rotational rate (carriage carrying rate), the size of the horizontal letters can be changed in each print mode. Home Position Detector Carriage Rear Angle Carriage Stay Carriage Motor Print Head Timing Belt Fig. 2-6 Print Head Carrying Mechanism 27

32 4-3. Ink ribbon feed mechanism The ink ribbon feed mechanism is linked to the print head carrying mechanism so the ink ribbon always winds automatically in the same direction while the carriage moves left and right. The movement of the carriage along the serrated edge of the rear angle of the printer mechanism drives the idler gear. The rotation of the idler gear is conveyed sequentially to the gears that work and wind the ribbon. The carriage has a clutch lever that keeps the direction of the cassette gear rotation constant, regardless of the direction of the idler gear rotation as the carriage moves left and right. Fig. 2-7 Ribbon feed mechanism 28

33 4-4. Paper Feed Mechanism The turn of the paper feed motor is transmitted to the PF (Paper Feed) roller and tractor unit via the release lever, frontrear release arm, tractor clutch lever, clutch gear and change lever. The paper feed motor is a HB (Hy Brid) 4-phase and 96 pulse motor. The changing of the rotational direction depends on the detectors on Frame L. There are threeways of feeding paper into the printer : the friction method, the tractor (front) method and tractor (rear) method. You can select the method you want to use by setting the release lever. [1] [2] [3] Clotch gear (Left) PF Roller (Front) Tractor (Rear) Release Lever Friction PF Roller (Rear) Tractor (Front) Clotch gear (Right) Fig. 2-8 Paper Feed Mechanism Front release arm Release lever Change lever Clutch gear Rear release arm Detector [1] Detector [2] Tractor clutch lever Fig. 2-9 Frame L Position of release lever [1] [2] [3] Paper feeding method Tractor (Front) Friction Tractor (Rear) Detector [1] OFF ON ON Detector [2] ON ON OFF Engaement of the clotch gear (Left) Not linked Not linked linked Engaement of the clotch gear (Right) linked Not linked Not linked Status of the PF roller and PF roller (Front) Not Pressed Pressed Status of the PF roller and PF roller (Rear) Pressed Pressed Not 29

34 4-5. Detectors (1) Print head temperature detectors The A/D converter in the CPU detects the print head temperature at power on and before each line begins to print. +5V +5V VREF FB11 Thermistor P90/AND CPU R1 R2 Control Method Fig Printer head temperature detector circuit Print Temperature Temperature text C Bit-lmage C Error stop (thermistor open) Normal print ~120 ~100 Unidirectional print 120~ ~130 Print stop Over 130 Over130 (2) Home position detector A photo-interrupter is used in the home detector on the printer. ON/OFF signals are generated according to the position of the carriage. (Shield plate mounted at the base of the carriage.) The printing position is determined by these signals. +5V Detecting signal C1 R1 R2 +5V R3 Fig Home position detector circuit Output (V) Decision 5 in home position (with shield plate) 0 not in home position (without shield plate) 30

35 (3) Paper end detector (Front) This detects the paper from the front of the printer. When paper is present, the photo transistor with the reflecting type photo sensor goes on. As soon as paper runs out, this transistor goes off, outputting a paper empty signal. VRef +5V R1 AN +5V R2 Paper C1 R3 CPU Fig Paper end detector (Front) circuit (4) Paper end detector (Rear) A photo-interrupter is used in the paper end detector (rear) on the printer. ON/OFF signals are generated as the paper end activates the paper detector lever mounted at the frame base. +5V Detecting signal C1 R1 R2 +5V R3 Fig Paper end detector (Rear) circuit Output (V) Decision 0 Paper present 5 Not paper (5) Paper end detector (Carriage unit) The paper end detector is located in the carriage unit. The A/D converter in the CPU detects the presence or absence of paper. VRef +5V R1 AN +5V R2 Paper C1 R3 CPU Fig Paper end detector (Carriage unit) circuit 31

36 (6) Release lever position detector The leaf switch is open when the release lever is in the friction position, and is closed in the tractor position. +5V Detecting signal R1 R2 Leaf switch Fig Release lever position detector Out put (V) Front SW Out put (V) Rear SW Paper feeding method 5 0 Tractor (Front) 0 0 Friction 0 5 Tractor (Rear) (7) Adjust lever position detector When the Adjust lever is set to or below position "3", the leaf switch becomes ON, as the Adjust lever is at "4" or above, the leaf switch comes to OFF. +5V Detecting signal R1 R2 Leaf switch Fig Adjust lever position Fig Adjust lever position circuit Out put (V) Control Method Adjust lever position Print method 5 0~3 Normal mode 0 4~8 Multi-part mode 32

37 CHAPTER 3 ADJUSTMENTS This printer has undergone various adjustments so that it will attain a given standard of performance. In this chapter, a brief explanation is given of the methods for making adjustments. Follow the instructions when performing maintenance inspections or when replacing parts to correct malfunctions. 1. Adjustment of Gap Between Print Head and Platen Adjustment of Timing Belt Tension Adjustment of Paper end detector

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39 1. Adjustment of Gap Between Print Head and Platen (1) Remove the upper case unit and ribbon holder [1] according to the procedures described in chapter 4. (Fig. 3-1) (2) Install rear angle [2]. (Drive the screw tightly while pushing down rear angle.) (3) Set adjust lever [3] to the second position from the bottom. (Fig. 3-1) (4) Adjust the head gap at the specified left, right and center positions (three places [4]). (Fig. 3-2) *Measure the gap between platen [4] and Print head [5] using a gauge [6]. (Fig. 3-3) *Gap adjustment values : 0.30 to 0.35mm. *Left, Right positions : Use adjust bushing L, R [7] to adjust the gap. (Fig. 3-4) *Center position : Use gap adjustment assy [8] to adjust the gap. (Fig. 3-5) *Adjust sequenc (six) : Left Right Center Left Center Right (5) Loosen rear angle [2] (6) Install the ribbon holder [1], rear angle [2] and upper case. Adjust gear Ajust lever [3] Adjusting busing L [7] Second Rear angle [2] Gap adjustemet assy [8] Frame (L) (left) Carriage unit (center) Roller angle unit (right) Frame (R) Adjusting busing R [7] Adjust position Ribbon holder [1] Fig. 3-1 Mechanism Fig. 3-2 Positioning the carriage unit Print head [5] gap gap Frame holder unit Gauge [6] + + PF roller Head gap 0.30~0.35mm Platen [4] L R Rear angle assy Fig. 3-3 Gap measurement Fig. 3-4 Adjusting bushing Fig. 3-5 Gap adjustment assy 35

40 2. Adjustment of Timing Belt Tension (1) Remove the front case unit according to the procedures described in chapter 4. (2) Move the carriage unit [1] up to the extreme right position. (3) Move the screw [3] fixing tension lever assembly [2] approximately 1mm to loosen the tension, then tighten the screw. The timing belt tension [4] is determined by the spring [5]. Tension lever assembly [2] Carriage unit [1] Timing blt [4] Spring [5] Screw [3] Fig 3-6 Adjustment of timing belt tension 36

41 3. Adjustment of Paper end detector After replacing the paper-end detector, adjust the new detector as described here. First enter the dedicated command, then flow chart below.(fanfold paper (Front) only) Dedicated command: <ESC> <SUB> (50)H n Send command Front Tractor? No Yes Paper Park END Enter paper-out value (A) Loading fanfold paper Enter paper-in value (B) Find average (center value) of (A) and (B) Normal range No Yes Print the new Paper end detector A/D value. massage (1) Print the error message. (2) Register the new Paper end detector A/D value Adjust ment error. New value not recorded END END (1) FRONT PAPER END SENSOR : upper : lower : OK : CR PAPER END SENSOR : upper : lower : OK : (2) FRONT PAPER END SENSOR : upper : lower : ERROR : CR PAPER END SENSOR : upper : lower : ERROR : 37

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43 CHAPTER 4 PARTS REPLACEMENT This chapter explains disassembly and reassembly of the printer. Note the following regarding disassembly and reassembly. 1. Disconnect the printer from the wall outlet before servicing it. 2. Assy is the reverse of disassembly unless otherwise specified. 3. After reassembly, coat the screw heads with locking sealant. 4. Lubrication information is not provided in this chapter. Refer to section 2 in chapter Upper Case Unit Ribbon Holder Printer Mechanism Main Logic Board Unit Power Supply Unit Fuse Carriage Motor Unit Print Head Carriage Board Unit Carriage Unit Roller Angle Unit Frame Holder Unit Paper Feed Roller Unit Paper Guide Unit Platen Assy Paper Feed Motor Assy Change Plate Assy

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45 1. Upper Case Unit [4] [5] [4] [2] [1] (1) Turn off the power switch. (2) Remove the power cord from the AC output socket. (3) Remove Platen knob unit [1] Rear cover [2] Sheet guide unit [3] Five screws [4] Upper case unit [5] Control panel board [6] [3] a [6] a 2. Ribbon Holder [1] [2] (1) Remove Upper case unit as described in section 1. (2) Move the carriage unit to the center. (3) Loosen two screws [1] (4) Lean the carriage unit to the rear angle assy [2]. (5) Remove Ribbon hoder [3] [1] [3] 41

46 3. Printer Mechanism [2] [1] [2] (1) Remove Upper case unit as described in section 1. Five screws [1] Two screws [2] Four connectors [3] Head cable [4] Printer mechanism [5] [4] [3] [5] 4. Main Logic Board Unit a [2] (1) Remove Printer mechanism as described in section 3. Connector [1] Five screws [2] Main logic board unit [3] [3] [1] a 42

47 5. Power Supply Unit [2] [4] [2] [3] [5] [2] (1) Remove Printer mechanism as described in section 3. Connector cable [1] Seven screws [2] Screw [3] Inlet holder [4] Switch holder [5] Power supply unit [6] a [1] [6] a 6. Fuse [1] (1) Remove Printer mechanism as described in section 3. Fuse F1 [1] Defective Replace fuse as follows: AC voltage Fuse Type 110V~240V 215 5A-250V New fuse blown Inspect circuit 43

48 7. Carriage Mottor Unit [8] [1] [2] [5] [7] (1) Remove Upper case unit as described in section 1. (2) Loosen screw [1] Remove Spring [2] Set tension lever assy [8] in the unlocked position Four screws [3] Four collars [4] Timing belt [5] Spring [6] Carriage motor unit [7] Note: When assembling the carriage motor assy, the tension lever assy [8] must be secured with the screw [1] when the spring [2] is in place. [3] [4] [6] 8. Print Head [3] [2] (1) Remove Upper case unit as described in section 1. Two screws [1] Head cable [2] Printer head [3] WARNING The print head gets hot after printing. Do not touch it until it cools. (2) Adjust Gap between print head and platen. Refer to section 1 of Chapter 3. [1] 44

49 + 9. Carriage Board unit (1) Remove Printer head as described in section 8. Connector [1] Carriage board unit [2] Release the hook [3] Remove the head cables from the frame holder unit. [3] [2] [1] Note : Fold the head cables according to the dimensions show below Double-sided tape 23 1 Cat size(double-sided tape) Size: mm 45

50 10. Carriage Unit [4] [6] [8] [1] [7] [5] [2] [12] [10] [11] [3] [9] [5] (1) Remove Printer Mechanism as described in section 3. Carriage Motor Unit as described in section 7. Stop ring [1] Timing belt [2] Two screws [3] Rear angle assy [4] Stop ring [6] Two ground pring [5] Adjust gear [7] Adjusting bushing L,R [8], [9] Adjusting bushings L/R can be removed by turning them. Carriage unit [10] Remove the head cables [11] from the frame holder unit [12] Adjusting bushing Side L [8] Side R [9] 11. Roller Angle Unit (1) Remove Upper case unit as described in section 1. Two Springs [1] Stop ring [2] Roller angle unit [3] [1] [2] [1] [3] 46

51 12. Frame Holder Unit [5] [4] [7] [3] [4] [1] [5] (1) Remove Tractor unit [1] Carriage motor unit [2] as described in section 7. Stop ring [3] Four roll pins [4] Three screws [5] Fastener [6] Detector unit [7] Frame holder unit [8] Remove the head cable [9] frome Frame holder unit [8]. [9] [2] Note: Roll pins [4] should not be used again once they have been removed. Always use new ones. [6] 13. Paper Feed Roller Unit [5] [1] [2] [4] (1) Remove Carriage unit as described in section 10. Frame holder unit as described in section 12. Spring [1] Two stop rings [2] Poly-slider [3] Gear [4] Paper feed roller unit [5] [3] [2] 47

52 14. Paper Guide Unit [1] [2] [4] [4] [6] (1) Remove Roller angle unit as described in section 11. Paper feed roller unit as described in section 13. Screw [1] Detector cover [2] Gear [3] Seventeen screws [4] Rom cover [5] Paper guide unit [6] Note: Gear [3] should not be used again once they have been removed. Always use new ones. [5] [3] [4] 15. Platen Assy [7] [8] [9] [1] [2] [3] [5] [10] [5] (1) Remove Paper guide unit as described in section 14. Stop ring [1] Adjust lever holder [2] (2) Move the adjust lever outward. (3) Remove Ground spring [4] Three stop rings [5] Gear [6] Bushing [7] Wave washer [8] Plain washer [9] Platen Assy [10] [4] [6] [5] 48

53 16. Paper Feed Motor Assy [6] (1) Remove Paper guide unit as described in section 14. Stop ring [1] Two poly-sliders [2] Spring [3] Gear [4] Paper feed motor assy [5] [4] [2] [5] [3] [1] 17. Change Plate Assy Side R [3] [4] [8] [9] [6] [3] [5] [10] [2] [1] [11] (1) Remove Paper guide unit as described in section 14. Stop ring [1] Gear [2] Two stop rings [3] Poly-Slider [4] Collar [5] Front release arm [6] rear release arm [7] Stop ring [8] Change lever [9] Gear [10] Change plate assy [11] [7] Side L 49

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55 CHAPTER 5 MAINTENANCE AND LUBRICATION 1. Maintenance Cleaning Checks Lubrication Lubricant Lubricating Method Lubricated Areas

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57 1. Maintenance In order to maintain the optimum performance of this printer and to prevent trouble, maintenance must be carried out according to the following items Cleaning (1) Removal of dirt Wipe off dirt with a soft cloth soaked in alcohol or benzine. Note: Do not use thinner, trichlene or ketone solvents because they may damage plastic parts. Also during cleaning, be careful not to moisten or damage electronic parts, wiring, or mechanical parts. (2) Removal of dust, pile, etc. Vacuum cleaning (with an electric cleaner) is preferred. Remove all dust, etc., inside the printer. Note: After cleaning, check the oil level. If it is not adequate due to cleaning, replenish it Checks Checks must be carried out at two levels: a daily check which the operator can easily carry out during operation, and a periodic check which an expert should carry out. (1) Daily check When the printer is used on a daily basis, check that the printer is used properly. Make sure that the printer is operating under the best conditions. Is any paper stuck in the paper box or printer case? Is the cartridge ribbon set at the right position? Is there any foreign matter inside the printer? (Remove if any.) Is the print head getting excessively dirty? (2) Periodic check After 6 months or printing 1 million lines, the periodic check and lubrication must be carried out. Check for deformation of springs. Check the gap between the platen and the print head. Remove dust, dirt, etc., around the detectors. 53

58 2. Lubrication Lubrication is very important to maintain optimum performance and to prevent trouble Lubricant The type of lubricant greatly affects the performance and durability of the printer, especially in a low temperature environment. We recommend use of the grease and lubrication oils listed below for this printer Type of oil Product name Maker Grease MOLYKOTE EM-30L DOW CORNING ASIA LTD Lubricant Mobil 1 Mobil oil 2-2. Lubricating Method When lubrication is carried out in assembly and disassembly, wash parts well to remove dust and dirt before lubrication. Lubrication must be carried out regularly once every 6 months or after 1 million lines have been printed. Lubrication is necessary irrespective of the regular lubrication whenever lubricant becomes deficient after cleaning or whenever parts have been disassembled or replaced Lubricated Areas NO. LubricationProduct Name [1] Rubbing surfaces of Rear angle assy EM - 30L [2] Rubbing surfaces of Carrige stay Mobill [3] Rubbing surfaces of Change plate assy and Roller holder EM - 30L [4] Rubbing surfaces of Platen assy and Bushing EM - 30L [5] Rubbing surfaces of Paper feed roller unit and Bushing EM - 30L [6] Rubbing surfaces of Paper feed roller unit and Change lever EM - 30L [7] Rubbing surfaces of Paper feed roller shaft and Release spring EM - 30L [8] Rubbing surfaces of Paper feed roller shaft and Roller holder EM - 30L [9] Rubbing surfaces of Timing pulley and Shaft EM - 30L [10] Rubbing surfaces of Pulley cap and Stop ring EM - 30L [11] Rubbing surfaces of Idler gear, gear and shaft EM - 30L [12] Rubbing surfaces of Rear release arm EM - 30L [13] Rubbing surfaces of Front release arm EM - 30L [14] Rubbing surfaces of Adjust rever holder and Shaft EM - 30L [15] Rubbing surfaces of Tractor clutich lever F and Shaft EM - 30L [16] Rubbing surfaces of Release lever and Index lever EM - 30L [17] Rubbing surfaces of Gear and Shaft EM - 30L [18] Rubbing surfaces of Tractor clutich lever R and Shaft EM - 30L [19] Rubbing surfaces of Felt Mobill [20] Rubbing surfaces of Rear roller, Bushing and Roller shaft EM - 30L [21] Rubbing surfaces of Gear cover and Shaft EM - 30L [22] Rubbing surfaces of Idler assy and Gear cover EM - 30L [23] Rubbing surfaces of Ribbn casette gear and Gear cover EM - 30L [24] Rubbing surfaces of Tractor shaft and Tractor frame L,R EM - 30L [25] Rubbing surface of PF roller shaft and Bushing EM - 30L [26] Rubbing surface of Gear and shaft EM - 30L 54

59 a [9] [10] R [7] C [1] D E H [8] [2] T B [25] [7] Q [8] G [25] A L [3] P [4] N [6] J [5] [3] [4] K a [5] O M J D E a Fig. 5-1 Lubricated Areas (printer mechanism) 55

60 C T [4] Q G A [3] [8] [11] [5] [6] [12] S [12] [8] F [13] [3] [13] [14] [5] S L H R B [14] [4] N Fig. 5-2 Lubricated Areas (printer mechanism 2/2) 56

61 a b [15] [16] b a [15] Fig. 5-3 Lubricated Areas (Frame L) [17] [18] Areas to Lubricate Fig. 5-4 Lubricated Areas (Frame R) 57

62 [26] [26] [20] [20] [21] [22],, [23],,,,,,,, [19] Rear of Gear Cover Areas to Lubricate Fig. 5-5 Lubricated Areas (Carriage unit) [24] [24] [24] [24] Fig. 5-6 Lubricated Areas (Tractor unit) 58

63 CHAPTER 6 TROUBLESHOOTING 1. Troubleshooting Procedures Unit Replacement Priority Chart Repair by Unit Replacement Repair by Parts Replacement Does not Operate at All with Power on Power Supply Circuit Abnormal Defective Motor Operation Defective Print Head Operation Defective Interface Operation Waveform with Oscilloscope

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65 1. Troubleshooting Procedures Troubleshooting is never easy because various problems arise depending upon the particular location of the breakdown. The following procedures should be taken in making repairs. (1) The first method is to make repairs through unit replacements. The two display codes appearing in the flow chart are defined as follows: 1) indicates main logic board replacement; and 2) indicates printer mechanism replacement, to be carried out if the problem has not been corrected. 1) Main Logic Board Replacement 2) Printer Mechanism Replacement Check again at this time whether the replaced unit is malfunctioning. (This is done to rule out trouble caused by improper contact of connectors.) Replaceable units consist of the following: Power supply unit Main logic board Printer mechanism Control panel board In replacing these units, always refer to the unit replacement priority chart. (2) The second method is to make repairs by parts replacement to replace defective elements inside a particular unit. (Note 1) Before starting to repair, be sure to check visually the contact of the connector and the mounting of the IC in the IC socket. (Note 2) Always turn off power source and remove power plug before replacing any units or parts. (Note 3) All check items shown in the flow chart must be checked. Otherwise, newly mounted parts or units may become damaged. (Note 4) If, in the process of making repairs, there is any confusion about proper procedures, restart the job from the beginning. (Note 5) Be careful to avoid injury from static electricity when handling ICs and main logic board. 61

66 2. Unit Replacement Priority Chart Category Operation related Motor related Print head related Detector related Interface related and others Error indication Problem Details Specific display lamp only will not glow Specific switch only cannot be input Buzzer does not sound (sound volume inadequate) Strange sounds during operation No motor holding power (power very weak) Dots skipped Print is too light Ink ribbon entanglement (wire sticks out) Absence of paper not detected Lever position not detected Incorrect printing Ink ribbon not forwarded No operation at EDS setting Faulty operation when power is turned on/off Abnormal motor operating speed (slow) Fuse blown during operation Error detection of head temperature Carriage motor error Paper handling error EE-PROM & RAM error Watch dog timer error Power supply unit 2 3 Unit Exchange Sequence Main logic board Printer mechanism Control panel board 1 1 Remarks Replace ink ribbon Check I/F cable HS-DRAF lamp blink ROMAN lamp blink COURIER lamp blink 10CPI lamp blink 15CPI lamp light Soft ware error 1 ORATOR lamp light Note: The figures 1, 2 and 3 mean the priority of replacement. 62

67 3. Repair by Unit Replacement START Turn power off. Remove I/F cable. Mount ink ribbon. Set paper. Move carriage to center. A Turn power on. Carriage Moves? NO B YES Carriage operates normally? YES NO Carriage motor operating waveform is normal? *1 NO *1 See (6) and waveform in item 5 of Chapter 6. YES Replace printer mechanism. 1) Replace main logic board. 2) Replace printer mechanism. Carriage stops at home position? (left side) NO A YES Home position switch signal is normal? NO YES Replace main logic board. 1) Replace main logic board. 2) Replace printer mechanism. 1 A 63

68 1 On line lamp light? NO YES On line lamp signal is normal? NO Press on line switch to take off line. YES Replace control panel board. Replace main logic board. On line lamp is out? YES NO A Press paper feed switch. E Paper feed switch operation is normal? YES NO Paper feed motor drive waveform is normal? *2 *2 See (7) waveform in item 5 of Chapter 6. NO Turn power off. YES 1) Replace main logic board. 2) Replace printer mechanism. Holding paper feed switch, turn power on. Self printing: Replace printer mechanism. A Carriage operates normally? YES NO Carriage motor drive waveform is normal? *3 YES *3 See (6) and waveform in item5 of Chapter 6. NO 1) Replace main logic board. 2) Replace printer mechanism. 2 Replace printer mechanism. A 64