PARTS CATALOGUE / TECHNICAL GUIDE

Transcription

1 PARTS CATALOGUE / TECHNICAL GUIDE [SPECIFICATIONS] Item Movement Cal. No. Cal. 7T84A 7T84A (x 1.0) Movement size Time indication Driving system Outside diameter Casing diameter Height Additional mechanism Loss/gain Regulation system Measuring gate by quartz tester Battery Jewels (Movement intervals) Battery No. Voltage Battery life Ø 27.6 mm Ø 27.0 mm 3.3 mm Main time: Hour, minute and small second hands (1 second) Mode dial (12 o clock position) Mode indicator TIMER (center position) Timer hands (TIMER minute and second hands, also used as a STOPWATCH 1/5-second hand and a STOPWATCH second hand) Small watch for alarm (6 o clock position) Alarm hour and minute hands (also used as a TIMER minute hand a TIMER second hand, STOPWATCH hour and minute hands, and hour and minute hands in the LOCAL TIME display) Step motor Electronic circuit reset switch Train wheel setting device Date calendar Instant setting device for date calendar Battery life indicator (The small second hand moves at two-second intervals.) System reset TIMER mode Maximum of 15-minute measurement time in 1-minute increments YACHTING TIMER mode 5-, 6- & 10-minute preset timers, Automatic relay function of the stopwatch (maximum of 12 hour measurement time in 1-second increments), Restart setting function STOPWATCH mode Maximum of 12 hour measurement time in 1/5-second increments, Hour, minute and 1/5-second hands ALARM mode Single-time alarm and regular alarm on a 12-hour basis LOCAL TIME mode Local time display in 1-minute increments on a 12-hour basis Monthly rate at normal temperature range: less than 15 seconds Nil Use 10-second gate. SR927W 1.55 V Approx. 3 years 0 jewel 4 pcs. /26

2 10 REMARKS ON REPAIRING CAL. 7T84A Cal. 7T84A has a new structure employing one crown and two buttons, but the basic movement structure of Cal. 7T84A is similar to the previous Cal. 7T Series watches, and the knowledge and technique you have gained in handling the previous Cal. 7T Series watches will come in handy when you repair Cal. 7T84A. When repairing, however, you are requested to have full knowledge of the features characteristic of these watches and strictly observe the repairing and checking instructions provided in this guide so that the watches will be repaired correctly. I. FEATURES Cal. 7T84A is a multifunctional analogue watch that features various functions including a yachting timer function, a stopwatch function and an alarm function. To select each mode, the mode indicator located at the 12 o clock position is used. Cal. 7T84A multifunctional yachting timer Timer hand Mode indicator Button A 13 MODE SELECT TIME TMR CHR ALM LOC Crown YACHTING TIMER MODE 10 9 Small second hand Yachting timer combines the functions of a count down timer and a stopwatch that starts operating automatically when the timer finishes counting down. This function is particularly useful in yacht racing. 5-, 6- & 10-minute preset timers are available. 6 Button B Alarm hour and minute hands Button operation (Crown position: First click) Button A: mode selection (selectable among 5-minute, 6-minute and 10-minute preset timers) (crown position: normal position) Button A: START/STOP Button B: RESET 2. ALARM MODE The single-time alarm that sounds only once at a designated alarm time, and the regular alarm that can be set to sound at a designated time everyday are available. The alarm time for the single-time alarm can be set within 12 hours from the current time in 1-minute increments. 3. STOPWATCH MODE The stopwatch can measure 12 hours in 1/5-second increments. When the measurement reaches 12 hours, the stopwatch automatically stops. Button operation (Crown position: First click) Button A: mode selection CHR (crown position: normal position) Button A: START/STOP Button B: SPLIT/SPLIT RELEASE/RESET 2/26

3 REMARKS ON REPAIRING CAL. 7T84A 4. SYSTEM RESET When an abnormal display appears, reset the built-in integrated circuit. The watch will resume its normal operation. Button operation (Crown position: Second click) Press and hold buttons A and B at the same time for longer than 2 seconds. II. NECESSARY PROCEDURE AFTER BATTERY CHANGE After installing the battery, pull out the crown to the second click position. And then follow the instructions below to correct the hand positions and set the time. Button A & B Press and hold both buttons A and B at the same time for longer than 2 seconds. Button B Press button B to set the small watch hands to the 0 position. Button A Press button A to turn the center hand a full circle. Button B Press button B to set the center hand to the 0 position. Button A Press button A to turn the mode indicator a full circle. Button B Press button B to set the mode indicator pointing at the dot marker of the TIME mode. Note* Crown Push back in to the normal position Crown Pull out to second click when the small second hand is at the 12 o clock positon. Crown Turn the crown to set the time of the main watch. Make sure that AM/PM is correctly set. Crown Push back in to the normal position in accordance with a time signal. Note* Pressing Button A for longer than 2 seconds here will allow you to resume the procedure again as indicated by the arrow if neccessary. 3/26

4 PARTS CATALOGUE Cal. 7T84A Disassembling procedures Figs. : 57 Reassembling procedures Figs. : 57 * For the type of oil and quantity of lubrication, refer to the following TECHNICAL GUIDE section. Remarks on removing the winding stem To remove the winding stem when taking out the movement from the case or while disassembling the par ts during repair work, be sure to pull out the crown to the first click, and then, remove the winding stem while pushing the setting lever Pin for date dial guard Date dial guard Date dial Intermediate wheel for calendar correction Date driving wheel Date corrector setting wheel Hour wheel for alarm Hour wheel Lubricating of some parts is shown in II. REMARKS ON DISASSEMBLING AND REASSEMBLING. 4/26

5 PARTS CATALOGUE Cal. 7T84A Anti magnetic shield plate B Battery clamp screw (3 pcs.) (SR927W) Battery Circuit block cover screw ( 3 pcs.) Battery clamp screw Battery clamp AC comment sticker Circuit block cover screw Piezoelecric element Circuit block cover *The piezoelectric element is adhered to the case back Conducting plate Friction spring for second counti Circuit block Lubricating of some parts is shown in II. REMARKS ON DISASSEMBLING AND REASSEMBLING. 5/26

6 PARTS CATALOGUE Cal. 7T84A Buzzer lead terminal Battery connection ( ) Pin for train wheel bridge Train wheel bridge Small second wheel TIMER wheel Fifth wheel & pinion Fourth wheel & pinion Intermediate wheel for TIMER First intermediate wheel for TIMER MODE wheel Third wheel & pinion Intermediate wheel for ALARM Center minute wheel for ALARM Spacer for center wheel & pinion Second intermediate wheel for TIMER Minute wheel Switch lever A Step rotor MODE rotor ALARM rotor TIMER rotor Setting lever Yoke Winding stem Lubricating of some parts is shown in II. REMARKS ON DISASSEMBLING AND REASSEMBLING. 6/26

7 PARTS CATALOGUE Cal. 7T84A Setting wheel Minute wheel for ALARM Clutch wheel Center wheel and pinion Coil block Coil block for TIMER Train wheel setting lever Rotor stator Rotor stator for TIMER Coil block for MODE Rotor stator for MODE Coil block for ALARM Rotor stator for ALARM Switch lever B Main plate Lubricating of some parts is shown in II. REMARKS ON DISASSEMBLING AND REASSEMBLING. 7/26

8 PARTS CATALOGUE Cal. 7T84A The correct parts for the followings are determined based on the design of cases. Check the case number, and refer to "Watch Parts Catalogue CD-ROM" or CPC web to choose corresponding parts. Holding ring for dial ( ) 3 Date dial (0878 ***) 42 Winding stem ( ) Point of distinction Refer to the illustrations below to see the difference between those two types of pins. 1 Pin for date dial guard Pin for train wheel bridge /26

9 No. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 57 Assembling the switching unit and wheels Set the main plate. Lubricate the lower pivots of the rotors. Lubricate the contact area between the small second wheel and main plate. Lubricate the point of engagement of switch lever B. Lubricate the axis of switch lever B. Lubricate the contact area between the small second wheel and main plate: Moebius F or AO-2 <57> Set the main plate. Lubricate the point of engagement of switch lever B: S-6 Lubricate the lower pivots of the rotors: Moebius F or AO-2 <Amount of lubricant Refer to the illustrations below to see the right amount of lubricant. (a) (b) (c) (a) Overlubricated (b) Appropriately lubricated (c) Underlubricated Appropriate amount (Stone) Appropriate amount (Convex part) Appropriate amounts-6 Lubricate the axis of switch lever B: Moebius V or AO-3 9/26

10 NO. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 56 Set switch lever B Set the rotor stator for ALARM Lubricate the axis of the setting wheel. Set the rotor stator for MODE. 51, 50 Rotor stator for TIMER Discrimination number Set the rotor stator. 48, 47 Set the coil block for TIMER and the coil block (A). Coil resistance: 2.10 K2.70 K 54 Set the rotor stator for ALARM. 6 Discrimination number6 53, 52 51, 50 Set the coil blocks for MODE and ALARM. Set the rotor stator for TIMER, and rotor stator. Discrimination number0 49 Set the train wheel setting lever. Lubricate the axis of the setting wheel: Moebius V or AO-3 49 Set the train wheel setting lever. 55 Set the rotor stator for MODE. 48, 47 Set the coil block for TIMER and the coil block (A) Set switch lever B. Discrimination number8 53, 52 Set the coil blocks for MODE and ALARM. Coil resistance: 1.80 K2.40 K 10/26

11 NO. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 46 Set the center wheel & pinion and lubricate its convex part and inner edge of the ring. 46 Set the center wheel & pinion and lubricate as illustrated below.2 points: Moebius AII or AO-3 39, 38, 37,36 Set the rotor for city setting, MODE rotor, ALARM rotor and step rotor. 45 Set the clutch wheel. 44 Set the minute wheel for ALARM. 43 Set the setting wheel. 42 Set and lubricate the winding stem. 41 Set the yoke. 40 Set the setting lever. 44 Set the minute wheel for ALARM. 6 39, 38 37, 36 Set the rotor for TIMER and the MODE rotor. Set the ALARM rotor and step rotor. 43Set the setting wheel. 45Set the clutch wheel. 42 Set and lubricate the winding stem: Lubricate the entire profile of the winding stem with Moebius V or AO Set the setting lever. Crown at the normal position. 41 Set the yoke. Remember to install the winding stem before setting the yoke. Otherwise the spring of yoke will lift the clutch wheel upward. The reset spring of the yoke is easily deformable. Handle it with extra care as deformation of the spring can cause reset failure as well as mode change malfunction. 11/26

12 No. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. Lubricate the switching unit. Point of contact between the train wheel setting lever and yoke. Point of contact in the tail portion of the yoke. Point of contact between the yoke and setting lever. Axis of the setting lever Axis of switch lever A Point of engagement of switch lever A Lubricate the point of contact in the tail portion of the yoke. (: Moebius V or AO-3 Lubricate the point of contact between the yoke and setting lever. (: S-6 Lubricate the point of contact between the train wheel setting lever and yoke. (Lubricate the two points with either Moebius V or AO Set the switch lever A. Lubricate the axis of the setting lever.(: S-6 Lubricate the axis of switch lever A. (: S-6 <35> Set switch lever A. Lubricate the point of engagement of switch lever A. (: S-6 12/26

13 NO. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC Set the second intermediate wheel for TIMER. Set the spacer for center wheel & pinion. 32 Set the minute wheel. 31, , Set the MODE wheel and center minute wheel for ALARM. Lubricate the point of contact of the spacer for center wheel & pinion. Set the first intermediate wheel for TIMER. Set the intermediate wheel for ALARM. Set the intermediate wheel for TIMER. Set the fifth wheel and pinion and third wheel and pinion. Set the fourth wheel and pinion. Set and lubricate the TIMER wheel. Set the small second wheel. 29 Set the first intermediate wheel for TIMER. White 34 Set the second intermediate wheel for TIMER. Dark Green 27 Set the intermediate wheel for MODE. White Lubricate the point of contact of the spacer for center wheel & pinion Moebius A or AO-3 22 Set the small second wheel. 23 Set and lubricate the TIMER wheel as illustrated. Lubricate the point of contact of the spacer for center wheel & pinion: Moebius A or AO-3. 26, 25Set the fifth wheel and pinion and third wheel and pinion. 24Set the fourth wheel & pinion. 31, 30 Set the MODE wheel and center minute wheel for ALARM. Center minute wheel for ALARM 28 Set the intermediate wheel for ALARM. 32Set the minute wheel. 33 Set the spacer for center wheel & pinion. 13/26

14 No. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 21 Set the train wheel bridge. <21> Set the train wheel bridge. Lubricate the upper pivots of the rotor for TIMER, MODE rotor, and ALARM rotor and step rotor Moebius F or AO-2 Lubricate the upper pivot of each rotor (at four points) illustrated below. Set the pin for train <20> Set the pin for train wheel bridge. 20 wheel bridge. Turn the pin 90-degree clockwise to fix it using a screwdriver. Make sure that the pin is put in the Set the battery 19 correct direction. connection (-) Never turn the pin more than 90 degrees. Lubricate the upper Upper pivot of the rotor pivots of the rotor for TIMER, MODE rotor, and ALARM rotor and step rotor. 18 Set the buzzer lead terminal. Lubricate the upper pivots of the minute wheel, center minute Minute wheel 1 wheel for ALARM, TIMER wheel, center minute wheel for MODE and small second wheel. Other portions <18> Set the buzzer lead terminal. <19> Set the battery connection (-). Lubricate the upper pivots of the minute wheel, center minute wheel for ALARM, TIMER wheel, minute wheel for MODE and small second wheel: Moebius F or AO-2. 14/26

15 NO. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC Assembling the circuit unit Set the circuit block. Set the friction spring for second counting. Set the conducting plate. Set the circuit block cover. Securely engage the four hooks. Tighten the circuit block cover screws. 3 positions 16 Set the friction spring for second counting. 15 Set the conducting plate. 17Set the circuit block. Make sure that the circuit block is securely engaged with the two guide pins of the train wheel bridge. Take care so as not to deform these parts while setting the circuit block. 14 Set the circuit block cover. Securely engage the four hooks. Remarks on installing the circuit block cover. (hooking portions) Take care so as not to deform the rotor stator or coil block. Make sure that the circuit block cover is correctly aligned with the two pins of the train wheel bridge. * Inaccurate alignment of the circuit block cover can cause malfunction of the yoke, resulting in defects of date correcting function. The hook of the circuit block cover is easily disengaged. Make sure that it is securely engaged with the pins all the way in at the four locations. Unhook the circuit block cover from a side angle using a pair of tweezers or a screwdriver while gently pressing it down. The conductive spring of the circuit block cover is easily deformable. Handle it with care so as not to deform it. 13 Tighten the circuit block cover screws (3 positions.) 15/26

16 NO. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC Set the battery clamp. Tighten the battery clamp screws. (3 positions) Measure the current consumption. (10) *Battery (9) *Anti magnetic shield plate B 12Set the battery clamp. 11Tighten the battery clamp screws. (3 positions) 16/26 *(10, 9) Install the battery and anti magnetic shield plate B when setting the case.

17 No. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. Assembling the calendar unit. 8 Set the hour wheel Set the hour wheel for ALARM. Set the date driving wheel. Set the date corrector setting wheel. Set the intermediate wheel for calendar correction. Lubricate the point of contact between the date dial and main plate. Set the date dial. <8> Set the hour wheel. The hour wheel is made of plastic. Make sure that the gear teeth are properly engaged when setting the hour wheel. <6> Set the date driving wheel. <7> Set the hour wheel for ALARM. Lubricate the point of contact between the date dial and main platemoebius A or AO-3 <4> Set the intermediate wheel for calendar correction. <3> Set the date wheel. <5> Set the date corrector setting wheel. 17/26

18 No. PROCESS ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 2 1 Set the date dial guard. Set the jumper. Set the pins for date dial guard. (2 positions) Lubricate the points of contact between: Date dial and date jumper. Main plate and date jumper. Date dial guard and date jumper. <1> Set the date dial guard.2 positions Turn the pin 90-degree clockwise to fix it using a screwdriver. Never turn the pin more than 90 degrees. <2> Set the date dial guard. Lubricating points of the calendar wheels: contact points between Date dial and date jumpermoebius F or AO-2 Main plate and date jumper: Moebius F or AO-2 Date dial guard and date jumpermoebius F or AO-2 18/26

19 No. PROCESS SPECIFICATIONS (QUALITY SPECIFICATIONS, HANDLING METHODS ETC.) Assembling the case 10 Set the battery. Pay extra attention so as not to short-circuit the battery. A Connect the AC component to the circuit block cover until a short circuit occurs to reset the int egrated circuit. Set the movement. Do not press the date dial down when handling the movement. Be careful so as not to deform the conducting spring of the movement. Check that the date changes correctly. Set the holding ring for dial. Set the dial. Make sure that the date changes smoothly without dragging. When installing the holding ring for dial, be careful so as not to unhook it. ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 10Set the battery. Install the battery in the direction shown by the arrow in the illustration below. Installing the battery from any other angle may result in bending or deforming the battery connection (-). System Reset Be careful so as not to deform the conducting spring while installing the battery or movement. Connect the AC component to the circuit block cover until a short circuit occurs to reset the integrated circuit. 19/26

20 No. PROCESS SPECIFICATIONS (QUALITY SPECIFICATIONS, HANDLING METHODS ETC.) (12 o clock position) Set the MODE hour hand. Check the hand position and hand installation height. (9 o clock position) Set the small second hand. Check the hand position and hand installation height. (6 o clock position) Set the ALARM hour hand. Set the ALARM minute hand. Check the hand position and hand installation height. (Center) Set the hour hand. Set the minute hand. Check the hand position and hand installation height. Set the TIME hand. Check the hand position and hand installation height. ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 7T84 A MULTIFUNCTIONAL YA CHTING TIMER TIMER hand Small second hand ALARM hour hand & ALARM minute hand MODE indicator Button A CROWN Button B 20/26

21 No. PROCESS SPECIFICATIONS (QUALITY SPECIFICATIONS, HANDLING METHODS ETC.) Remove the winding stem. Set the movement with dial and hands into the case. Set the winding stem. Set the buttons. (2 pieces) Set the antimagnetic shield plate B. Close the case back. Pull out the crown temporarily to the first click position when removing the winding stem. Remove dust and dirt on the movement with dial and hands and inside of the case before casing *1Only some models require this process. Whether a watch requires this process or not depends on the design of its case. Make sure that it is securely set in the correct direction. ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. 42 Be careful so as not to deform the winding stem conducting spring of the circuit block cover while removing or installing the winding stem. 42 Set the winding stem. For a watch with a screw lock type crown, apply silicone grease (100,000 to 500,000 c.s.) to the point of contact between the winding stem and gasket of the crown. A sufficient amount of silicone should be applied so that the entire surface becomes wet. (See the illustration below.) 9Set the anti magnetic shield plate B. Crown Close the case back. Make sure that the circuit block cover is securely hooked before closing the case back. 21/26

22 Functional Inspection Operational Specifications (Reference) 7T84 Rotation Button to press Mode TIME YACHTING TIMER (5-, 6- & 10-minute preset timers) Normal position First click position Second click position Free Turn clockwise: date setting System reset Button A Button B Alarm preview Stop single-time alarm Set the single-time alarm Stop single-time alarm START/STOP RESTART (after stopwatch starts operating) RESET SPLIT/SPLIT RELEASE (after stopwatch starts operating) TIMER ALARM LOCAL TIME START/STOP Alarm preview Stop regular alarm Null RESET Stop regular alarm Null Button A: Mode change TIME 5-minute yatching timer 6-minute yachting timer 10-minute yachting timer TIMER STOPWATCH ALARM LOCAL TIME Button B Null Null Null Set the regular alarm Set the local time time Press and hold both Button B Button A Button B Button A Button B Buttons A & B at the Adjust the alarm hour and Adjust the timer hand Adjust the mode indicator same time for 2 minute hands position. position. position. seconds Keep pressing down to Keep pressing down to Keep pressing down to fast-forward. fast-forward. fast-forward. Set the main watch time After installing the battery, reset the built-in integrated circuit, push the crown back to the normal position, and then set the time of the main watch. 22/26

23 Cal. 7T82A TEC HNICA L GUIDE NO. PROCESS SPECIFICATIONS (QUALITY SPECIFICATIONS, HANDLING METHODS ETC.) Affix the AC comment sticke r. For instructions on where to affix the sticker, refer to the illustration at the right. ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC. Instructions on where to affix the AC comment sticker 23/26 Case back Guide for the piezoelectric element position Piezoelectric element AC comment sticker AC comment sticker Before affixing the AC comment sticker, make sure that the center of the piezoelectric element and the center of the AC comment sticker are correctly aligned. Failing to do this can cause a continuity defect resulting in a malfunction of the ALARM, as the AC comment sticker may adversely contact the buzzer lead terminal. NoteThe AC comment sticker must be affixed to all calibers (models).

24 TECHNICAL GUIDE Cal. 7T84A IV. VALUE CHECKING Coil block resistance Coil block ( ) Coil block for TIMER ( ) Coil block for ALARM ( ) 2.10 KΩ ~ 2.70 KΩ 2.10 KΩ ~ 2.70 KΩ 1.80 KΩ ~ 2.40 KΩ Coil block for MODE ( ) 1.80 KΩ ~ 2.40 KΩ Upconverter coil resistance : 150 Ω ~ 180 Ω Current consumption For the whole movement Less than 1.10 µ A (with 1.55 V supplied from a battery) (when the stopwatch is not used) For the circuit block alone Less than 0.30 µ A (with 1.55 V supplied from a battery) How to measure the current consumption 1. To measure the current consumption for the circuit block alone or for the whole movement, connect each tester of S-860 to the appropriate positive (+) or negative (-) input terminal of the circuit block. * When measuring the current consumption using the SEIKO Multi-Tester S-860, select the measurement range as follows: For the whole movement: Use the range of 40 µ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S) For the circuit block alone: Use the range of 4 µ A of SUPPLY V (= 1.55 V) & GATE TIME (2 S) * When measuring the current consumption for the circuit block alone, be careful not to damage or deform the pattern of the circuit block. 2. Connect the AC component to the positive terminal for 2 seconds until a short circuit occurs to reset the integrated circuit. 3. After the integrated circuit is reset, wait approximately for 10 seconds until a stable measurement is obtained, and then read the measurement. * When measuring the current consumption for the circuit block alone, be sure to protect the integrated circuit from light. * Refer to the illustration below to measure the current consumption for the circuit block alone. 24/26

25 TECHNICAL GUIDE Cal. 7T84A V. TROUBLESHOOTING Movement Symptom Possible causes Solutions The watch stops operating. The battery has been depleted. The hour wheel and the pinion of the minute wheel are not properly engaged. (Or the teeth of the hour wheel and/or minute wheel have been broken.) The hooking portions of the circuit block cover are not properly engaged, resulting in poor conductivity. Measure the battery voltage. Replace the battery with a new one. Check the relevant parts, and replace the damaged parts with new ones. Securely attach the hooks of the circuit block cover to the main plate. The current consumption for the whole movement exc e e d s t h e s t a n d a r d value. The current consumption for the circuit block alone exceeds the standard value. The date dial shows an abnormal movement. The date dial does not move. The date does not change. The coil is broken. One or more wheels have been contaminated with dirt, dust or other particles. An excessive amount of oil in the movement has caused adhesive forces among the parts. (wringing) Dirt, dust or foreign particles are adhered to the movement. The driving pulse is generated in order to compensate the excessive load applied to the wheels. (The oil has deteriorated, leaked or run out.) The light from outside the movement is affecting the measurement. There is a defect in the IC (integrated circuit). The date dial has become improperly engaged with the date driving wheel or disengaged from the date driving wheel. The date jumper has been disengaged. Measure the coil block resistance. Replace the coil with a new one. Remove dirt or dust and clean the contaminated wheels. Be careful so as not to damage the teeth of the plastic parts while cleaning. Remove dirt, dust or foreign particles and clean the movement. If the current consumption for the circuit block alone is within the standard value range, overhaul and clean the movement parts, and then make the measurement again. Shut out the light, and make the measurement again. Replace the circuit block with a new one. Check the rotation and engagement of the date dial. Bend the date dial downward to adjust the clearance. Or replace the date dial with a new one. 25/26

26 TECHNICAL GUIDE Cal. 7T84A Symptom Possible causes Solutions Stopwatch/ Alarm One or more hands of the stopwatch or a larm have stopped moving or sh ow an abnormal movement. The step motor sh ows. an abnormal movement The buttons do not operate normally. When operating in the stopwatch mode, the stopwatch minute hand counts another minute before the stopwatch second hand counts sixty seconds. After pushing button A, stopwatch second hand counts the first 1/5 second then stops. It may start working when pressing button A repeatedly. While operating the split time measurement, the stopwatch second hand gains seconds after pressssing button B to release split time measurement. The relevant coil is broken. Measure the coil block resist - ance. Replace the coil with a new one if necessary. An excessive load is being ap - Clean the relevant parts and lu - plied to the chronograph wheels bricate with an adequate amount due to dust or foreign particles of oil. adhering to them or oil starvation. There is a crack on the circuit Replace the circuit block with a block switch pattern. new one. The step motor has been deformed. The amount of oil around the but - tons is insufficient. The circuit block pat tern has been broken or bent. All these symptoms may happen when starting operation of stopwatch after the following series of operations which are not supposed to occur in normal use. 1 ) T h e p r e v i o u s m e a s u r e m e n t of stopwatch had started. 2 ) The mode had been changed while the stopwatch had concounting up to 12 hours until it had automatically stopped. 3 ) C h a n g i n g t h e m o d e b a c k t o the stopwatch mode and pressing button A to start without resetting (The stopwatch hands go back to 0 position after automatically) Replace the stator with a new one. Clean the buttons and lubricate appropriately. Adjust the circuit block pattern or replace the circuit block with a new one. Reset the stopwatch by pressing button B. T h e a l a r m d o e s n o t sound. The alarm sound is too small. The upconverter coil is broken. The piezoelectric element is bro - ken or out of alignment. Replace the circuit block with a new one. Remount the piezoelectric ele - ment or replace it with a new one. Exterior parts The crown falls off. The current consumption exceeds the standard value. The winding stem is not securely installed. (The setting lever and yoke are disengaged.) An excessive load is being ap - plied due to friction among the hour, minute and chronograph hands. Check the main plate, winding stem, setting lever and yoke. Replace the defective parts with new ones. Adjust or remount the relevant hands. Small a mount of water/ blur inside of the glass persists. Water resistance is deteriorated. The watch has been subjected to water pressure that excee ds the guaranteed degree. Investigate the causes to take necessary measures, while clean - ing inside of the watch. 26/ by revision: 2007 Nov