Seiko 7T82A Quick start guide

PARTS CATALOGUE/TECHNICALGUIDE

Cal. 7T82A

[SPECIFICATIONS]

Cal. No.

Item

Movement

size

Time indication

Outside diameter

Casing diameter

Height

Driving system

Additional mechanism

Loss/gain

Regulation system

Measuring gate by quartz tester

Battery Battery No.

Voltage

Battery life

Jewels

1/26

(x 1.0)

Ø 27.0 mm

Ø 27.6 mm

3.3 mm

Main time: Hour, minute and small second hands (1 second)

Nil

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

Monthly rate at normal temperature range: less than 15 seconds

Use 10-second gate.

SR927W

Nil

1.55 V

Approx. 3 years

•STOPWATCH functions

40-minute measurement in 1/100-second increments, consecutively

measureable up to 120 minutes.

Accumulated elapsed time measurement

Split time measurement

STOPWATCH hand position adjustement

4 pcs.

7T82A

• STOPWATCH:

STOPWATCH minute hand (40 minutes)

STOPWATCH second hand

STOPWATCH 1/10-second hand

STOPWATCH 1/100-second hand

(Movement intervals)

REMARKS ON REPAIRING CAL. 7T82A

2/26

The basic movement structures of Cal. 7T82A 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. 7T82A.

When repairing, however, you are requested to have the full knowledge of the features character-

istic 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

As Cal. 7T82A has new movement structures, time setting and STOPWATCH hand position adjust-

ment differ from those of the other Cal. 7T Series watches.

As a result of this structure change, the battery life of Cal. 7T82A has increased to 3 years as com-

pared with that of the other Cal. 7T series watches.

●Measurement performance

Displays the elapsed time with the 4 designated STOPWATCH hands.

Measures up to 40 minutes in 1/100 second increments.

●Button operation (Crown position: Normal position)

Button A: START/STOP

Button B: SPLIT/SPLIT RELEASE/RESET

●Measurement functions

Accumulated elapsed time measurement and split time measurement are available.

1. STOPWATCH FUNTION

1/100 SEC.

012

MIN.

STOPWATCH 1/10 second hand

Small second hand STOPWATCH minute hand

Button B

Crown

Button A

STOPWATCH 1/100 second hand

STOPWATCH second hand

Cal. 7T82A

1/100-second chronograph

2. 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.

REMARKS ON REPAIRING CAL. 7T82A

3/26

After installing the battery, reset the built-in integrated circuit, and then set the time and reset

the STOPWATCH hands to the "0" position following the procedure below.

II. NECESSARY PROCEDURE AFTER BATTERY CHANGE

Pull out to the 2nd click when the small second hand is at the

12 o’ clock position.

Turn to set the main time.

* Check that AM/PM is correctly set.

Pull out the crown to the 2nd click.

Press and hold both buttons A and B at the same time for longer than 2 seconds.

Button A

Crown

Systen Reset

Note*

Push back in to the normal position in accordance with a time signal.

Crown

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.

Button B

Button A

Button B

Button A

Button B

Press Button A for longer than 2 seconds.

The STOPWATCH 1/100 second hand turns a full circle.

Press Button B to set the STOPWATCH

1/100 second hand to the “0” position.

Press Button A for longer than 2 seconds.

The STOPWATCH second hand turns a full circle.

Press Button B to set the STOPWATCH

second hand to the “0” position.

Press Button A for longer than 2 seconds.

The STOPWATCH minute hand turns a full circle.

Press Button B to set the STOPWATCH minute hand to

the “0” position.

Cal. 7T82A

PARTS CATALOGUE

4/26

Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

2 0808 580

Date dial guard

3 0878 526

Date dial

4 0962 580

Intermediate wheel

for calendar correction

5 0737 580

Date corrector setting wheel

6 0802 580

Date driving wheel

7 0271 583

Chronograph 1/10 second

counting wheel

8 0271 588

Hour wheel

1 0027 973

Pin for date dial guard

Disassembling procedures Figs. : 1 56

Reassembling procedures Figs. : 56 1

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.

* For the type of oil and quantity of lubrication, refer to the following TECHNICAL GUIDE section.

PARTS CATALOGUE Cal. 7T82A

5/26

4259509

Anti magnetic shield plate B

3013 250 (SR927W)

Battery

0022 230

Battery clamp screw

4225 546

Battery clamp

0022 459

Circuit block cover screw

4457 980

Circuit block cover

4224 514

Conducting plate

0396 580

Friction spring for second counting

4000 610

Circuit block

0022 459

Circuit block cover screw

( 3 pcs.)

0022 230

Battery clamp screw (3 pcs.)

Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

Cal. 7T82A

PARTS CATALOGUE

6/26

4270 710

Battery connection (–)

0240 580

Small second wheel

0701 580

Fifth wheel & pinion

0885 592

Chronograph intermediate wheel for

1/100 second

0885 594

Chronograph first intermediate

wheel for second

0888 593

Chronograph 1/100 second

counting wheel

4283 581

Spacer for center wheel & pinion

0885 595

Chronograph second intermediate

wheel for second

4146 710

Step rotor

4146 710

Chronograph rotor for second

4146 710

Chronograph rotor for 1/100 second

0027 974

Pin for train wheel bridge

0125 509

Train wheel bridge

0888 582

Chronograph second counting

wheel

0241 583

Fourth wheel & pinion

0231 580

Third wheel & pinion

0950 590

Chronograph intermediate minute

counting wheel

0270 582

Chronograph minute counting

wheel

0261 580

Minute wheel

4450 703

Switch lever A

4146 710

Chronograph rotor for minute

0383 592

Setting lever

0384 582

Yoke

0351 583

Winding stem

Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

PARTS CATALOGUE Cal. 7T82A

7/26

0281 580

Setting wheel

0885 593

Chronograph intermediate wheel

for 1/10 second

0282 585

Clutch wheel

0221 583

Center wheel & pinion

4002 700

Coil block (A)

4002 700

Coil block for chronograph second

0391 591

Train wheel setting lever

4239 710

Rotor stator

4002 711

Coil block for chronograph

minute

4002 711

Coil block for chronograph 1/100

second

4239 712

Rotor stator for chronograph

minute

4450 701

Switch lever B

4239 711

Rotor stator

for chronograph second

4239 713

Rotor stator for chronograph

1/100 second

0100 559

Main plate

Lubricating of some parts is shown in "II. REMARKS ON DISASSEMBLING AND REASSEMBLING."

Cal. 7T82A

PARTS CATALOGUE

8/26

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" to choose corresponding parts.

 ✳ Holding ring for dial (0866 651)

3 Date dial (0878 526)

41 Winding stem (0351 583)

• Point of distinction

Refer to the illustrations below to see the difference between those two types of pins.

1 Pin for date dial guard

0027 973

20 Pin for train wheel bridge

0027 974

Cal. 7T82A TE C HNICAL GUIDE

9/26

No.



PROCESS



ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.



Assembling the

switching unit and

wheels



56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

the switch lever B.



Lubricate the axis of

the switch lever B.



<56> Set the main plate.

Lubricate the contact area between the small

second wheel and main plate: 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

Appropriate amount(Stone)

Appropriate amount(Convex part)

Appropriate amountS-6

Lubricate the point of engagement of

the switch lever B: S-6

Lubricate the axis of the switch lever B: Moebius V or AO-3

Lubricate the lower pivots of the rotors: Moebius F or AO-2

Cal. 7T82A TE C HNICAL GUIDE

10/26

NO.



PROCESS



ILLUSTRATIONS AND SPECIAL INSTRUCTIONS ETC.



55 Set the switch lever B.



Set the rotor stator for

chronograph 1/100

second.



Lubricate the axis of the

setting wheel.



53 Set the rotor stator for

chronograph minute.



52, 51

Set the coil blocks for

chronograph 1/100

second and chronograph

minute.



50, 49

Set the rotor stator for

chronograph second,

and rotor stator.



48 Set the train wheel

setting lever.



47, 46

Set the coil block for

chronograph second and

the coil block (A).



54

Set the rotor stator for

chronograph 1/100 second.

50, 49

Rotor stator for chronograph

second



Discrimination number

Set the rotor stator



Discrimination number0





47, 46Set the coil block for chronograph second and the coil block (A).

Coil resistance: 2.10 K2.70 K

55

Set the switch lever B.

52, 51

Set the coil blocks for chronograph 1/100 second and

chronograph minute.

Coil resistance: 1.80 K2.40 K

53

Set the rotor stator for

chronograph minute.

Lubricate the axis of the setting

wheel: Moebius V or AO-3

48

Set the train wheel setting lever.

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