PARTS CATALOGUE TECHNICAL GUIDE - Watch...

PARTS CATALOGUE / TECHNICAL GUIDE

[SPECIFICATIONS]

Cal. No.

Item7T62A

Movement

(x 1.0)

Movementsize

ø27.0 mm

Outside diameter

Casing diameter

Cal. 7T62A, 7T92A

ø27.6 mm

Timeindication

Hour, minute and small second hands

Height

Additional mechanism

3.3 mm

Loss/gain Monthly rate at normal temperature range: less than 15 seconds

Regulation system Nil

Measuring gate by quartz tester Use 10-second gate.

Battery

Battery life Approx. 3 years

Battery No.SEIKO SR927W, SONY SR927W,Maxell SR927W, Matsushita SR927W

Voltage 1.55 V

Driving system Step motor (Load compensated driving pulse type, 4 pcs.)

• Electronic circuit reset switch• Train wheel setting device• Date calendar• Instant setting device for date calendar• Battery life indicator

7T92A

The illustrations refer to Cal. 7T62A.

Main time

Minute hand1/5-second hand(Moves at 0.2-second intervals.)Stopwatch

Hour and minute handsSecond hand1/20-second hand(Moves at 0.05-second intervals.)

Hour and minute hands(Minute hand moves at 1-minute intervals.)Alarm

• Stopwatch function· Measures up to 60 minutes in

1/5 second increments.· Accumulated elapsed time

measurement· Split time measurement

• Single-time alarm function

• Stopwatch function· Measures up to 12 hours in

1/20 second increments.· Accumulated elapsed time

measurement· Split time measurement

Jewels 0 jewels

SEIKO SR927SW, SONY SR927SW,Maxell SR927SW, Matsushita SR927SW

2

Cal. 7T62A, 7T92A

Unlike 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.

As 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.

Measurement performance

Cal. 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 operation

Standard Measurement

5 5

FEATURES

Button “A”

Button “B”

Crown

CAL. 7T62A

Button “A”

Button “B”

Crown

1. STOPWATCH FUNCTION

A Start A Stop B Reset

Accumulated Elapsed Time Measurement

A Start A Stop B ResetA Restart A Stop

Split Time Measurement

A Start B Split B ResetB Split release A Stop

Measurement of Two Competitors

A Start B Finish time of1st competitor

B Reset

A 2nd competitorfinishes

B Finish time of2nd competitor

REMARKS ON REPAIRING CAL. 7T62A AND 7T92A

CAL. 7T92A

3

Cal. 7T62A, 7T92A

Single-time alarm: Can be set to ring only once within the coming 12 hours.

Alarm engaged with the crown at the normal position.

Alarm setting operation

2. ALARM FUNCTION (For Cal. 7T62A only)

Crown Pull out tothe 1st click.

B Press to setthe alarm time.

Crown Push back in to thenormal position.

PARTS CATALOGUEDisassembling procedures Figs. : 1 → 55

Reassembling procedures Figs. : 55 → 1

Lubricating: Types of oil Oil quantity

Moebius A Normal quantity

Moebius F Liberal quantity

SEIKO Watch Oil S-6

The illustration refers toboth Cal. 7T62A and 7T92A.

Remarks on removing

the winding stem

To 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.

Please see the page shown after the part name.Lubricating of some parts is shown in “III. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

2 0808 580Date dial guard

1 0027 973Pin for date dial guard

3 (0878 527) Date dial

4 0962 580Intermediate wheel forcalendar correction

5 0737 580Date corrector setting wheel

6 0802 580Date driving wheel

7 0271 583Hour wheel for alarm

8 0271 588Hour wheel

pages 8 & 11

The type of the partis determined basedon the case design. page 8

page 11

4

Cal. 7T62A, 7T92A

11 SR927WBatteryThe illustration refers

only to Cal. 7T62A.

0022 230• Battery clamp screw (2 pcs.)

0022 459• Circuit block cover screw (4 pcs.)

(4589 801)Piezoelectric element

Case back

24 0701 580Fifth wheel & pinion

21 0240 580Small second wheel

25 0885 590First intermediate wheelfor second counting

26 0885 591Second intermediate wheelfor second counting

28 0950 590Intermediate minutecounting wheel

29 0902 580Minute counting wheel

32 0261 582Minute wheel for alarm

10 4225 511Battery clamp

9 0022 230Battery clamp screw

13 4457 814Circuit block cover

12 0022 459Circuit block cover screw

14 0396 580Friction spring for second counting

15 4000 517Circuit block

16 4246 700Buzzer lead terminal

17 4270 710Battery connection (–)

18 0027 974Pin for train wheel bridge

20 0888 582Second counting wheel

19 0125 586Train wheel bridge

22 0241 583Fourth wheel & pinion

23 0231 580Third wheel & pinion

27 0261 580Minute wheel

30 0950 590Intermediate alarm wheel

31 0270 582Center wheel for alarm

Cal. 7T62A


page 1

page 11

page 11

page 12

pages 8 & 12

pages 8 & 12

page 13

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

page 14

5

Cal. 7T62A, 7T92A

The illustration refers only to Cal. 7T62A.

40 4146 710Chronograph rotor for minute

39 4146 710Chronograph rotor for second

46 0282 585Clutch wheel

51 4239 711Rotor stator forchronograph second

34 4002 700Coil block (A)

33 4002 711Coil block for alarm

38 4146 710Step rotor

37 4146 710Alarm rotor

41 4450 703Switch lever (A)

42 0383 592Setting lever

43 0384 582Yoke

44 0281 580Setting wheel

45 0351 583 Winding stem

48 0221 583Center wheel & pinion

47 4283 581Spacer for center wheel& pinion

49 0391 591Train wheel setting lever

50 4239 710Rotor stator

52 4239 712Rotor stator for alarm

53 4239 713Rotor stator for chronograph

54 4450 701Switch lever (B)

36 4002 711Coil block for chronograph

35 4002 700Coil block for chronograph second

55 0100 586Main plate

Cal. 7T62A


The type of the partis determined basedon the case design.

page 8

page 14

page 14

page 14

page 16

page 16

page 16

page 16

page 16

page 16

page 14

page 14

page 14

6

Cal. 7T62A, 7T92A

11 SR927SWBattery




26 0885 595Second intermediate wheelfor second counting

28 0950 590Intermediate wheel forsecond counting (1/20)

29 0902 580Second counting wheel (1/20)

32 0261 582Intermediate wheel forhour counting

10 4225 512Battery clamp

9 0022 230Battery clamp screw

13 4457 814Circuit block cover

12 0022 459Circuit block cover screw

14 0396 580Friction spring for second counting

15 4000 518Circuit block

17 4270 710Battery connection (–)

18 0027 974Pin for train wheel bridge


19 0125 586Train wheel bridge




30 0950 590Intermediate minute counting


The illustration refersonly to Cal. 7T92A.

0022 230• Battery clamp screw (2 pcs.)

0022 459• Circuit block cover screw (4 pcs.)

Cal. 7T92A


page 1

page 11

page 11

page 12

pages 8 & 12

pages 8 & 12

page 13

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

page 15

7

Cal. 7T62A, 7T92A

40 4146 710Chronograph rotor forsecond (1/20)

39 4146 710Chronograph rotor for second

46 0282 585Rotor stator forsecond counting (C)

51 4239 711Rotor stator forchronograph second

34 4002 700Coil block (A)

33 4002 711Coil block for chronograph (B)


41 4450 703Switch lever (A)

42 0383 592Setting lever

43 0384 582Yoke


48 0221 583Center wheel & pinion


49 0391 591Train wheel setting lever

50 4239 710Rotor stator

52 4239 712Rotor stator for chronograph (B)

53 4239 713Rotor stator for secondcounting (1/20) (D)

54 4450 701Switch lever (B)

37 4146 710Chronograph rotor for minute

35 4002 700Coil block for second counting (A)

55 0100 586Main plate

36 4002 711Coil block for secondcounting (1/20) (B)

The illustration refers only to Cal. 7T92A.

Cal. 7T92A


45 0351 583 Winding stem

The type of the partis determined basedon the case design.

page 8

page 15

page 15

page 15

page 16

page 16

page 16

page 16

page 16

page 16

page 15

page 15

page 15

8

Cal. 7T62A, 7T92A

Remarks:

The 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.

The 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. 7T62A

Holding ring for dial 0866 650

3 Date dial 0878 527

45 Winding stem 0351 583

1 Pin for date dial guard 0027 973

18 Pin for train wheel bridge 0027 974

15 Circuit block

CAL. 7T92A

• Point of distinction

[Pin for date dial guard] [Pin for train wheel bridge]

HoleNo hole

9

Cal. 7T62A, 7T92A

• 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”.

Input terminal (+)

Output terminal

Input terminal (–)

Crystal unit

C-MOS-IC

Upconverter coil(only for Cal. 7T62A)

Output terminal

Output terminal

TECHNICAL GUIDE

I. STRUCTURE OF THE CIRCUIT BLOCK

II. NECESSARY PROCEDURE AFTER BATTERY CHANGE

After installing the battery, set the time and reset the stopwatch hands to the “0” position following theprocedure below.

5 5

Button “A”

Button “B”

Crown

Button “A”

Button “B”

Crown

Crown 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.

B

CAL. 7T62A

Press to set the alarm hands to thecurrent time.

A Press for 2 seconds.

* The stopwatch 1/20 second hand turns a fullcircle.

A Press for 2 seconds.* The stopwatch minute hand turns a full circle.

B Press to set the stopwatch 1/20

second hand to the “0” position.

CAL. 7T62A CAL. 7T92A

CAL. 7T92A

10

Cal. 7T62A, 7T92A

B Press to set the stopwatch minute

hand to the “0” position.


* The stopwatch second hand turns a full circle.


* The stopwatch 1/5 second hand turns a fullcircle.

B Press to set the stopwatch 1/5 secondhand to the “0” position.

B Press to set the stopwatch secondhand to the “0” position.


* The stopwatch hour and minute hands turn afull circle.

B Press to set the stopwatch hour and

minute 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

The hour wheel is made of engineering plastics. When pulling out the hour hand, take care not to damagethe hour wheel.

1) 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.

When disassembling the dial, take care not to bend the dial leg. Raise the portions around the dial leg byturns gradually to remove the dial.

• Caution for disassembling

• How to install

* After installing the hands, be sure to check that they move smoothly without interfering with oneanother.


Hands

Dial

11

Cal. 7T62A, 7T92A

Turn 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.

When installing the hour wheel, check that it engages with the pinion of the minute wheel.

When installing the battery clamp, set it securely to the two hooking portions of the movement.

1) Loosen the four circuit block cover screws.

2) Release the four hooking portions of the circuitblock cover. (Indicated by the arrows in theillustration at right)

1 Pin for date dial guard

8 Hour wheel

10 Battery clamp

13 Circuit block cover

• How to remove • How to install

• Lubricating

Lubricate the wheel edge of both the date drivingwheel and date dial.

• How to remove

Moebius A

Screw

Screw

Screw

Protruded portion

Guide post

12

Cal. 7T62A, 7T92A

“b” portion

“a” portion

1) 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.

To set the friction spring for second counting, slip itinto the gap under the train wheel bridge.

The 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.

a

e

b

c

d

Have 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.

Turn the pin 90° counterclockwise with a screwdriverto loosen the pin.

Set the pin in the direction as shown at right. Then,turn it 90° clockwise with a screwdriver to fix the pin.

14 Friction spring for second counting

15 Circuit block

18 Pin for train wheel bridge

• How to install

• Setting position


• How to install

• How to remove

• How to install Pin for trainwheel bridge

13

Cal. 7T62A, 7T92A

After 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)

Minute counting wheel (1/20) (for Cal. 7T92A)

Before 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, the

train 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.

Notes:

* Intermediate minute counting wheel and intermediate alarm wheel can be used interchangeably.

* The following four rotors for each calibre can be used interchangeably:

• Chronograph rotor for second • Chronograph rotor for minute • Alarm rotor and • Step rotor

• Chronograph rotor for second (1/20) • Chronograph rotor for second • Chronograph rotor for minute and • Step rotor

19 Train wheel bridge

Wheels and pinions


• Lubricating

• How to install

Moebius A

Moebius F

See the illustration on the next page.

• Setting position

14

Cal. 7T62A, 7T92A


26 0885 591Second intermediatewheel for secondcounting

28 0950 590Intermediate minutecounting wheel




32 0261 582Minute wheel for alarm

37 4146 710Alarm rotor

30 0950 590Intermediate alarm wheel

31 0270 582Center wheel for alarm





39 4146 710Chronograph rotor forsecond

40 4146 710Chronograph rotor forminute




The illustrations refer only to Cal. 7T62A.

15

Cal. 7T62A, 7T92A


26 0885 595Second intermediatewheel for secondcounting

28 0950 590Intermediate wheel forsecond counting (1/20)

29 0902 580Second counting wheel(1/20)



32 0261 582Intermediate wheel forhour counting

37 4146 710Chronograph rotor forminute

30 0950 590Intermediate minutecounting






39 4146 710Chronograph rotor forsecond

40 4146 710Chronograph rotor forsecond (1/20)




The illustrations refer only to Cal. 7T92A.

16

Cal. 7T62A, 7T92A

Switch lever (A)

Winding stem

IV. VALUE CHECKING

Coil block resistance

Coil block (A)

Coil block for chronograph second

Coil block for chronograph minute (Cal. 7T62A)Coil block for second counting (1/20) (Cal. 7T92A)

Coil block for alarm (Cal. 7T62A)Coil block for chronograph (Cal. 7T92A)

1.70 KΩ ~ 2.60 KΩ

1.70 KΩ ~ 2.60 KΩ

1.80 KΩ ~ 2.40 KΩ

1.80 KΩ ~ 2.40 KΩ

Upconverter coil resistance : 150 Ω ~ 180 Ω

41 Switch lever (A)

42 Setting lever

43 Yoke

49 Train wheel setting lever

48 Center wheel and pinion

55 Main plate

• Setting position and lubricating

• Lubricating

• Lubricating

Moebius A

SEIKO Watch Oil S-6

Switch lever axlefor switch lever (B)

Moebius A

Moebius F

SEIKO Watch Oil S-6

Moebius A

Train wheel setting lever

Yoke

Setting lever

17

Cal. 7T62A, 7T92A

Current consumption

For the whole movement Less than 1.10 µA (with 1.55 V supplied from a battery)(when the stopwatch is not used)

For the circuit block alone Less 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:

For the whole movement Use the range of 40 µA of SUPPLY V (= 1.55 V) & GATE TIME (2 S)

For the circuit block alone Use the range of 4 µA of SUPPLY V (= 1.55 V) & GATE TIME (2 S)

V. FUNCTION CHECKING

Follow the procedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE” to set the time handsand reset the stopwatch hands to the “0” position.

TIME SETTING AND STOPWACTH HAND POSITION ADJUSTMENT

* 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.

STOPWACTH FUNCTION

1. Checking for Standard Measurement / Accumulated Elapsed Time Measurement

A Press repeatedly to check if the stop-watch 1/5 second hand starts andstops with each press.

Check if the stopwatch minute handstarts moving as the accumulatedelapsed time exceeds one minute.

A Press to stop the measurement.

B Press to check if all the stopwatch

hands return to the “0” position.

A Press repeatedly to check if the stop-watch 1/20 second hand starts andstops with each press.

Check if the stopwatch hour andminute hands start moving as theaccumulated elapsed time exceeds oneminute.


B Press to check if all the stopwatch

hands return to the “0” position.

2. Checking for Split Time Measurement

A Press to start the measurement.

B Press to check if the stopwatch hands stop to indicate the split time.

B Press to check if the split time is released and if the hands move quickly to indicate the elapsed time.

B Press repeatedly to check if the split time is measured and released with each press.


B Press to check if all the stopwatch hands return to the “0” position.


18

Cal. 7T62A, 7T92A

Note for the stopwatch 1/20 second hand for Cal. 7T92A:

* After the stopwatch is started, the stopwatch 1/20-second hand automatically stops and stays at the “0”position if the measurement exceeds 10 minutes. When the measurement is stopped or split time ismeasured, it moves to indicate the elapsed 1/20 seconds.Also, after the stopwatch is restarted or split time is released, the stopwatch 1/20-second handautomatically stops and stays at the “0” position if the measurement exceeds 10 minutes.

* Before checking the alarm function, set the time and alarm hands to the current time following theprocedure in “II. NECESSARY PROCEDURE AFTER BATTERY CHANGE”.

ALARM FUNCTION (Only for Cal. 7T62A)

1. Alarm Time Setting

B Press repeatedly to set the alarm hands.

* With each press, they move one minute. They move quickly if the button is kept pressed. They stop as they reach thecurrent time. Release and press the button, and the hands will start moving again.

Crown Pull out to the 1st click.

2. Alarm Engagement

Crown Push back in to the normal position.* At the designated alarm time the alarm rings for 20 seconds and stops. To stop it manually, press button “A” or

“B”.* After the alarm rings, the alarm minute hand starts moving at one-minute intervals as the alarm hands indicate

the current time.

3. To Cancel or Readjust the Designated Alarm Time

B To cancel: Press repeatedly to set the alarm hands to the desired alarm time.

To readjust: Press repeatedly to set the alarm hands to the desired alarm time.

Crown Pull out to the 1st click.

Crown Push back in to the normal position.

* Printed on recycled paper. 2002-2 Printed in Japan

PARTS CATALOGUE TECHNICAL GUIDE - Watch...

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