PARTS CATALOGUE TECHNICAL GUIDE - The Watch Site
PARTS CATALOGUE / TECHNICAL GUIDECal. 7T62A, 7T92A[SPECIFICATIONS]Cal. No.7T92A7T62AItemMovementThe illustrations refer to Cal. 7T62A.MovementsizeTimeindication(x 1.0)Outside diameterø27.6 mmCasing diameterø27.0 mmHeight3.3 mmMain timeHour, minute and small second handsStopwatchMinute hand1/5-second hand(Moves at 0.2-second intervals.)Hour and minute handsSecond hand1/20-second hand(Moves at 0.05-second intervals.)AlarmHour and minute hands(Minute hand moves at 1-minute intervals.)Driving systemStep motor (Load compensated driving pulse type, 4 pcs.)Additional mechanism Electronic circuit reset switchTrain wheel setting deviceDate calendarInstant setting device for date calendarBattery life indicator Stopwatch function· Measures up to 60 minutes in1/5 second increments.· Accumulated elapsed timemeasurement· Split time measurement Single-time alarm function Stopwatch function· Measures up to 12 hours in1/20 second increments.· Accumulated elapsed timemeasurement· Split time measurementLoss/gainMonthly rate at normal temperature range: less than 15 secondsRegulation systemNilMeasuring gate by quartz testerUse 10-second gate.BatteryBattery No.SEIKO SR927W, SONY SR927W,Maxell SR927W, Matsushita SR927WVoltage1.55 VBattery lifeApprox. 3 yearsJewels0 jewelsSEIKO SR927SW, SONY SR927SW,Maxell SR927SW, Matsushita SR927SW
Cal. 7T62A, 7T92AREMARKS ON REPAIRING CAL. 7T62A AND 7T92AUnlike the other Cal. 7T Series watches, which have two crowns and three buttons, Cal. 7T62A and Cal. 7T92A haveone crown and two buttons. But, their basic movement structure is similar in other respects, and the knowledgeand technique you have gained in handling the previous Cal. 7T Sereis watches will come in handy when yourepair Cal. 7T62A/7T92A.When repairing, however, you are requested to have the full knowledge of the features characteristic of thesewatches and strictly observe the repairing and checking instructions provided in this guide so that the watcheswill be repaired correctly.FEATURESAs Cal. 7T62A/7T92A has fewer crowns and buttons, the operating procedures for alarm setting (for Cal. 7T62Aonly), time setting and stopwatch hand position adjustment differ from those of the other Cal.7T Series watches.As a result of this structure change, the battery life of Cal. 7T62A/7T92A has increased by one year to 3 years ascompared with that of the other Cal. 7T series watches.Button “A”Button “A”Crown5Button “B”Button “B”CAL. 7T92ACAL. 7T62A1.Crown5STOPWATCH FUNCTION Measurement performanceCal. 7T62A : Measures up to 60 minutes in 1/5 second increments.Displays the elapsed time with the stopwatch minute and 1/5-second hands.Cal. 7T92A : Measures up to 12 hours in 1/20 second increments.Displays the elapsed time with the stopwatch hour, minute, second and 1/5-second hands. Button operationA Stop A Start Standard MeasurementB ResetB Split releaseA Stop A Restart A Stop A Start Accumulated Elapsed Time MeasurementB ResetA Stop B Split A Start Split Time MeasurementB Reset2B Finish time of2nd competitor A 2nd competitorfinishes B Finish time of1st competitor A Start Measurement of Two CompetitorsB Reset
Cal. 7T62A, 7T92A2.ALARM FUNCTION (For Cal. 7T62A only) Single-time alarm:Can be set to ring only once within the coming 12 hours.Alarm engaged with the crown at the normal position.B Press to setthe alarm time. Crown Pull out tothe 1st click. Alarm setting operationCrown Push back in to thenormal position.PARTS CATALOGUEDisassembling procedures Figs. :1 55Reassembling procedures Figs. :55 1Lubricating:Types of oilOil quantityMoebius ANormal quantityMoebius FLiberal quantitySEIKO Watch Oil S-610027 973Pin for date dial guard20808 580Date dial guard3(0878 527) Date dialThe illustration refers toboth Cal. 7T62A and 7T92A.pages 8 & 11 The type of the partis determined basedon the case design.page 840962 580Intermediate wheel forcalendar correctionRemarks on removingthe winding stem50737 580Date corrector setting wheelTo remove the winding stem whentaking out the movement from thecase or while disassembling the partsduring repair work, be sure to pullout the crown to the first click, andthen, remove the winding stem whilepushing the setting lever.60802 580Date driving wheel70271 583Hour wheel for alarm80271 588Hour wheel page 11Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.3
Cal. 7T62A,7T62A 7T92A0022 230 Battery clamp screw(2 pcs.)0022 459 Circuit block cover screw(4 pcs.)90022 230Battery clamp screw104225 511Battery clamppage 1111SR927WBatterypage 1120022 459Circuit block cover screw134457 814Circuit block cover14page 120396 580Friction spring for second counting154000 517Circuit block164246 700Buzzer lead terminal174270 710Battery connection (–)18pages 8 & 120027 974Pin for train wheel bridge190125 586Train wheel bridgepage 13200888 582Second counting wheelpage 14220241 583Fourth wheel & pinionpage 14230231 580Third wheel & pinionpage 14270261 580Minute wheelpage 1430page 140950 590Intermediate alarm wheel310270 582Center wheel for alarmpage 14320261 582Minute wheel for alarmpage 14The illustration refersonly to Cal. 7T62A.(4589 801)Piezoelectric elementpage 11Case back210240 580Small second wheelpage 14240701 580Fifth wheel & pinion25page 140885 590First intermediate wheelfor second counting26page 140885 591Second intermediate wheelfor second counting280950 590Intermediate minutecounting wheelpage 14290902 580Minute counting wheelpage 14 4page 14pages 8 & 12Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
Cal. 7T92A7T62ACal. 7T62A,The illustration refers only to Cal. 7T62A.page 14384146 710Step rotor40page 144146 710Chronograph rotor for minute4647510282 585Clutch wheel4283 581Spacer for center wheel& pinion4239 711Rotor stator forchronograph second 334002 711Coil block for alarm344002 700Coil block (A)354002 700Coil block for chronograph second364002 711Coil block for chronograph374146 710Alarm rotor39page 144146 710Chronograph rotor for second414450 703Switch lever (A)page 16420383 592Setting leverpage 16430384 582Yokepage 16440281 580Setting wheelpage 14450351 583 Winding stempage 14page 14page 8 The type of the partis determined basedon the case design.page 16480221 583Center wheel & pinion49page 160391 591Train wheel setting lever504239 710Rotor stator524239 712Rotor stator for alarm534239 713Rotor stator for chronograph544450 701Switch lever (B)550100 586Main platepage 16Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.5
Cal. 7T62A,7T92A 7T92A0022 230 Battery clamp screw(2 pcs.)0022 459 Circuit block cover screw(4 pcs.)The illustration refersonly to Cal. 7T92A.210240 580Small second wheel0022 230Battery clamp screw104225 512Battery clamppage 1111SR927SWBatterypage 1120022 459Circuit block cover screw134457 814Circuit block cover14page 120396 580Friction spring for second counting154000 518Circuit block174270 710Battery connection (–)18pages 8 & 120027 974Pin for train wheel bridge190125 586Train wheel bridge20page 150888 582Second counting wheel220241 583Fourth wheel & pinionpage 15page 15page 11pages 8 & 12page 13240701 580Fifth wheel & pinionpage 15230231 580Third wheel & pinionpage 1525page 150885 594First intermediate wheelfor second counting270261 580Minute wheelpage 15page 150885 595Second intermediate wheelfor second counting30page 1531page 150950 590Intermediate minute countingpage 150270 582Minute counting wheel2628290950 590Intermediate wheel forsecond counting (1/20)page 150902 580Second counting wheel (1/20) 69320261 582Intermediate wheel forhour countingpage 15Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.
Cal. 7T92ACal. 7T62A,The illustration refers only to Cal. 7T92A.384146 710Step rotorpage 15404146 710Chronograph rotor forsecond (1/20)page 154647510282 585Rotor stator forsecond counting (C)334002 711Coil block for chronograph (B)344002 700Coil block (A)354002 700Coil block for second counting (A)364002 711Coil block for secondcounting (1/20) (B)37page 154146 710Chronograph rotor for minute39page 154146 710Chronograph rotor for second414450 703Switch lever (A)page 16420383 592Setting leverpage 16430384 582Yokepage 16440281 580Setting wheelpage 15450351 583 Winding stem4239 711Rotor stator forchronograph second page 8 The type of the partpage 154283 581Spacer for center wheel& pinionis determined basedon the case design.page 16480221 583Center wheel & pinion49page 160391 591Train wheel setting lever504239 710Rotor stator524239 712Rotor stator for chronograph (B)534239 713Rotor stator for secondcounting (1/20) (D)544450 701Switch lever (B)550100 586Main platepage 16Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.7
Cal. 7T62A, 7T92ARemarks: Holding ring for dial 0866 6503Date dial0878 52745Winding stem0351 583The types of the parts are determined based on the design of cases. Check the case number, and refer to“Casing Parts Catalogue” to choose corresponding parts.1Pin for date dial guard0027 97318Pin for train wheel bridge0027 974 Point of distinction[Pin for train wheel bridge][Pin for date dial guard]15Circuit blockThe circuit blocks of Cal. 7T62A and 7T92A have a hole for discrimination as shown in the illustrations below.* The holes for discrimination are intended to discriminate between the circuit blocks for Cal. 7T62A andCal. 7T92A only.CAL. 7T62ANo hole8CAL. 7T92AHole
Cal. 7T62A, 7T92ATECHNICAL GUIDE The explanation here is only for the particular points of Cal. 7T62A and 7T92A. For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERALINSTRUCTIONS”.I.STRUCTURE OF THE CIRCUIT BLOCKInput terminal ( )C-MOS-ICInput terminal (–)Output terminalOutput terminalCrystal unitUpconverter coil(only for Cal. 7T62A)II.Output terminalNECESSARY PROCEDURE AFTER BATTERY CHANGEAfter installing the battery, set the time and reset the stopwatch hands to the “0” position following theprocedure below.Button “A”5Button “A”Crown5CrownButton “B”Button “B”CAL. 7T92ACAL. 7T62ACrown Pull out to the 2nd click when the small second hand is at the 12 o’clock position. Crown Turn to set the time hands to the current time.* Check that AM/PM is correctly set. CAL. 7T62A B Press to set the alarm hands to thecurrent time. A Press for 2 seconds. A Press for 2 seconds.* The stopwatch 1/20 second hand turns a fullcircle. B Press to set the stopwatch 1/20second hand to the “0” position. * The stopwatch minute hand turns a full circle.CAL. 7T92A 9
Cal. 7T62A, 7T92A B Press to set the stopwatch minutehand to the “0” position. A Press for 2 seconds.* The stopwatch second hand turns a full circle. A Press for 2 seconds.B Press to set the stopwatch secondhand to the “0” position.* The stopwatch 1/5 second hand turns a fullcircle. A Press for 2 seconds.B Press to set the stopwatch 1/5 secondhand to the “0” position.* The stopwatch hour and minute hands turn afull circle. B Press to set the stopwatch hour andminute hands to the “0” position. Crown Push back in to the normal position in accordance with a time signal. Pressing Button “A” for 2 seconds can resume the procedure again as indicated by the arrow if necessary.III. REMARKS ON DISASSEMBLING AND REASSEMBLING Hands Caution for disassemblingThe hour wheel is made of engineering plastics. When pulling out the hour hand, take care not to damagethe hour wheel. How to install1) Pull out the crown with winding stem to the second click. Then, turn the crown clockwise to turn thetime hands also clockwise.2) Stop turning the hands when the date changes to the next.3) Install the small second, hour and minute hands so that they point exactly to the 12 o’clock position.4) Install the stopwatch hands so that they point exactly to the “0” position of the stopwatch scale.* After installing the hands, be sure to check that they move smoothly without interfering with oneanother. Dial Caution for disassemblingWhen disassembling the dial, take care not to bend the dial leg. Raise the portions around the dial leg byturns gradually to remove the dial.10
Cal. 7T62A, 7T92A1Pin for date dial guard How to remove How to installTurn the pin 90 counterclockwise to loosen thepin.Set the pin securely into the groove. Then, turnit 90 clockwise to fix the pin.Notes:* Do not turn the pin more than 90 in either direction.* Do not turn the pin forcibly. LubricatingLubricate the wheel edge of both the date drivingwheel and date dial.Moebius A8Hour wheelWhen installing the hour wheel, check that it engages with the pinion of the minute wheel.10Battery clampWhen installing the battery clamp, set it securely to the two hooking portions of the movement.Guide postProtruded portion13ScrewCircuit block cover How to remove1) Loosen the four circuit block cover screws.Screw2) Release the four hooking portions of the circuitblock cover. (Indicated by the arrows in theillustration at right)Screw11
Cal. 7T62A, 7T92A How to install“b” portion1) Have the four hooking portions of the circuitblock cover (indicated by the arrows in theillustration at right) catch the movement securely.In doing so, check if the circuit block is set properlyto guide posts “a” and “b”, and reset it in positionif necessary.2) Tighten the four circuit block cover screws. Whentightening the screws, take care not to cut the coil.“a” portion14Friction spring for second counting Setting positionTo set the friction spring for second counting, slip itinto the gap under the train wheel bridge.15Circuit block Caution for disassemblingThe circuit block is fixed to the train wheel bridge withthe guide pins (“a”, “b”, “c”, “d” and “e” in theillustration shown at right). When removing thecircuit block from the guide pins, take care not todamage the circuit block.eadb How to installHave the guide holes of the circuit block (“a”, “b”, “c”,“d” and “e” portions in the illustration) securelycaught by the guide pins of the train wheel bridge andthe guide tubes of the main plate.18cPin for train wheel bridge How to removeTurn the pin 90 counterclockwise with a screwdriverto loosen the pin. How to installSet the pin in the direction as shown at right. Then,turn it 90 clockwise with a screwdriver to fix the pin.12Pin for trainwheel bridge
Cal. 7T62A, 7T92A LubricatingAfter installing the pin, lubricate the upper pivot of thefollowing parts: Chronograph rotor for second, chronograph rotorfor minute, alarm rotor and step rotor (for Cal.7T62A)Chronograph rotor for second (1/20), chronographrotor for second, chronograph rotor for minute andstep rotor (for Cal. 7T92A) Minute wheel Small second wheel Minute counting wheel (for Cal. 7T62A)Second counting wheel (1/20) (for Cal. 7T92A) Minute wheel for alarm (for Cal. 7T62A)Moebius AMinute counting wheel (1/20) (for Cal. 7T92A)19Moebius FTrain wheel bridge How to installBefore installing the train wheel bridge, carefully check the setting positions of the wheels and rotors. Besure to check that each rotor has a lower pivot attached securely.If the wheels and rotors are all set in position with the winding stem with crown at the first click, thetrain wheel bridge can be installed smoothly. There is no need to press down the train wheel bridge.If the train wheel bridge will not be seated in position smoothly, the other parts must be set in the wrongposition. Check their setting positions. Wheels and pinionsNotes:* Intermediate minute counting wheel and intermediate alarm wheel can be used interchangeably.* The following four rotors for each calibre can be used interchangeably:CAL. 7T62ACAL. 7T92A Chronograph rotor for secondChronograph rotor for minuteAlarm rotor andStep rotorChronograph rotor for second (1/20)Chronograph rotor for secondChronograph rotor for minute andStep rotor Setting positionSee the illustration on the next page.13
Cal. 7T62A, 7T92AThe illustrations refer only to Cal. 7T62A.310270 582Center wheel for alarm230231 580Third wheel & pinion220241 583Fourth wheel & pinion384146 710Step rotor24212514300950 590Intermediate alarm wheel374146 710Alarm rotor0701 580Fifth wheel & pinion320261 582Minute wheel for alarm270261 580Minute wheel200888 582Second counting wheel474283 581Spacer for center wheel& pinion440281 580Setting wheel290902 580Minute counting wheel404146 710Chronograph rotor forminute260885 591Second intermediatewheel for secondcounting0240 580Small second wheel0885 590First intermediate wheelfor second counting394146 710Chronograph rotor forsecond280950 590Intermediate minutecounting wheel
Cal. 7T62A, 7T92AThe illustrations refer only to Cal. 7T92A.310270 582Minute counting wheel230231 580Third wheel & pinion220241 583Fourth wheel & pinion384146 710Step rotor242125300950 590Intermediate minutecounting374146 710Chronograph rotor forminute0701 580Fifth wheel & pinion320261 582Intermediate wheel forhour counting270261 580Minute wheel200888 582Second counting wheel474283 581Spacer for center wheel& pinion440281 580Setting wheel290902 580Second counting wheel(1/20)404146 710Chronograph rotor forsecond (1/20)260885 595Second intermediatewheel for secondcounting0240 580Small second wheel0885 594First intermediate wheelfor second counting394146 710Chronograph rotor forsecond280950 590Intermediate wheel forsecond counting (1/20)15
Cal. 7T62A, 7T92ATrain wheel setting lever41Switch lever (A)42Setting lever43Yoke49Train wheel setting leverYokeSetting lever Setting position and lubricatingSwitch lever (A)Winding stemMoebius ASEIKO Watch Oil S-648Center wheel and pinion LubricatingMoebius A55Main plate LubricatingSwitch lever axlefor switch lever (B)Moebius AMoebius FSEIKO Watch Oil S-6IV. VALUE CHECKING Coil block resistanceCoil block (A)1.70 KΩ 2.60 KΩCoil block for chronograph second1.70 KΩ 2.60 KΩCoil block for chronograph minute (Cal. 7T62A)Coil block for second counting (1/20) (Cal. 7T92A)1.80 KΩ 2.40 KΩCoil block for alarm (Cal. 7T62A)Coil block for chronograph (Cal. 7T92A)1.80 KΩ 2.40 KΩ Upconverter coil resistance : 150 Ω 180 Ω16
Cal. 7T62A, 7T92A Current consumptionFor the whole movementLess than 1.10 µA (with 1.55 V supplied from a battery)(when the stopwatch is not used)For the circuit block aloneLess than 0.20 µA (with 1.55 V supplied from a battery)When measuring the current consumption with SEIKO Multi-Tester S-860, select the measurement range asfollows:V.For the whole movementUse the range of 40 µA of SUPPLY V ( 1.55 V) & GATE TIME (2 S)For the circuit block aloneUse the range of 4 µA of SUPPLY V ( 1.55 V) & GATE TIME (2 S)FUNCTION CHECKING TIME SETTING AND STOPWACTH HAND POSITION ADJUSTMENTFollow the procedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE” to set the time handsand reset the stopwatch hands to the “0” position. STOPWACTH FUNCTION* Before checking the stopwatch function, reset the stopwatch hands to the “0” position following theprocedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE”.* Check that the crown is at the normal position. Otherwise, the stopwatch operation cannot be made.1. Checking for Standard Measurement / Accumulated Elapsed Time MeasurementCAL. 7T62ACAL. 7T92AA Press repeatedly to check if the stopwatch 1/5 second hand starts andstops with each press.A Press repeatedly to check if the stopwatch 1/20 second hand starts andstops with each press. Check if the stopwatch minute handstarts moving as the accumulatedelapsed time exceeds one minute.Check if the stopwatch hour andminute hands start moving as theaccumulated elapsed time exceeds oneminute. A Press to stop the measurement.A Press to stop the measurement. B Press to check if all the stopwatchhands return to the “0” position.B Pre
SEIKO Watch Oil S-6 The illustration refers to both Cal. 7T62A and 7T92A. Remarks on removing the winding stem To remove the winding stem when taking out the movement from the case or while disassembling the parts during repair work, be sure to pull out the crown to the first click, and then,
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