Seiko 7T04A Technical Manual

PARTS CATALOGUE / TECHNICAL GUIDE

Cal. 7T04A

[SPECIFICATIONS]

Cal. No.

Item

Interval of hands movement

Driving system

Additional function

Loss /gain

Regulation system

Gate time for rate measurement

Power

supply

Battery No.

Battery voltage

Battery life

Number of jewels

1/21

Crown

operation

Normal position

1st click position

2nd click position

Current consumption

Coil resistance

1 second

0 jewel

Stepping motor, 3 pieces

• Stopwatch function
60-minute stopwatch in 1/5-second increments.

• Battery life indicator (The small second hand moves at two-second
intervals.)

• Second hand stop function

• Electronic circuit reset function

• Big date indicator function

4002700 (COIL BLOCK and COIL BLOCK FOR SECONDS COUNTING)

2.10 - 2.70 K

Ω

Use 10-second gate.

SEIKO SR927SW

Nil

1.55 V
Approx. 5 years

7T04A

• 3 hands (hour, minute,
and small second
hand)

• 24-hour indicator

• Big date indicator

4002711 (COIL BLOCK FOR MINUTE COUNTING)

1.80 - 2.40 K

Ω

Free

Date setting (clockwise)

Time setting, hand position adjustment / resetting the circuit

Monthly rate: Less than 15 seconds (worn on the wrist at the tempera

-

ture bet ween 5 and 35)

• Diameter
Outside: Ø 27.6 mm Casing : Ø 27.0 mm

• Height: 4.93 mm

Movement: Less than 1.10 μA
Circuit block: Less than 0.20 μA

SPECIFICATIONS

2/21

Cal. 7T04A

Cal. 7T04A is a new basic calibre which has a big date indicator function, but the basic movement

structure of Cal. 7T04A 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. 7T04A.

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.

FEATURES

This is the multi-display analogue watch featuring a stopwatch function.

●

The time is indicated by the 24-hour, hour and minute hands, and a small second hand.

●

The stop watch can measure up to 60 minutes in 1/5-second increments.

After 60 minutes,

it will start counting again from “0” repeatedly up to 12 hours.

●

Measurement performance

Displays the elapsed time with the 2 designated STOPWATCH hands.

Measures up to 60 minutes in 1/5-second increments.

●

Button operation ( Crown position: Normal position)

Button A: START/STOP

Button B: SPLIT/SPLIT RELEASE/RESET

1. STOPWATCH FUNCTION

Cal. 7T0 4A

A

B

a b c

CROWN

Hour hand

Minute hand

STOPWATCH 1/5-second hand

STOPWATCH minute hand

Small second hand

Big date indicator

a: Normal position
b: First click
c: Second click

24-hour hand

SPECIFICATIONS

3/21

Cal. 7T04A

After installing the bat tery, pull out the crown to the second click position. And then follow the

instructions below to correct the hand positions and set the time.

NECESSARY PROCEDURE AFTER BATTERY CHANGE

Pull out to the second click position when the small second hand is at
the 60 seconds position. The small second hand stops on the spot.

Turn to set the main time. * Check that AM/PM is correctly set.

Crown

Crown

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

Crown

Button A

Button B

Button A

Button B

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. It moves quickly if button B is kept pressed.

Press Button A for longer than 2 seconds.
The STOPWATCH hour and second hand turns a full circle.

Press Button B repeatedly to reset the STOPWATCH
second hand to the “0” position (12:00). It moves quickly
if button B is kept pressed.

● Standard measurement

Button A

START

→

Button A

STOP

→

Button B

RESET

● Split (intermediate) time measurement

Button A

START

→

Button B

SPLIT

Button B

SPLIT RELEASE

→ → →

Button B

RESET

Button A

STOP

● A ccumulated elapsed time measurement

Button A

START

→

Button A

STOP

Button A

STOP

→

Button B

RESET

→

Button A

RESTART

… →

Measurement and release of the split time can be repeated by pressing button B.

Restart and stop of the stopwatch can be repeated by pressing button A.

● Measurement of two competitors

Button A

START

Button B

RESET

Button B

FINISH TIME OF FIRST

RUNNER

Button A

SECOND RUNNER

FINISH

→ →

Button B

FINISH TIME OF

SECOND RUNNER

→ →

●

Measurement functions

Accumulated elapsed time measurement and split time measurement are available.

Cal. 7T04A

PARTS LIST

4/21

2 DATE DIAL FOR

TEN’S DIGIT
0878B95

3 DATE DISK GUARD

SCREW (2pcs.)
0012354

4 DATE DISK GUARD

0808522

5 DATE JUMPER SCREW

FOR UNIT’S DIGIT
0012354

6 DATE DISK FOR

UNIT’S DIGIT
0878B93

7 DATE JUMPER FOR

UNIT’S DIGIT
0810504

8 DATE JUMPER FOR

TEN’S DIGIT
0810505

1 DATE DIAL SCREW

FOR TEN’S DIGIT
0012354

DATE DRIVING WHEEL
0802515

9

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

Disassembling procedures Figs. : 1 62

Reassembling procedures Figs. : 62 1

Remarks on removing the Setting stem

To remove the SETTING STEM when taking
out the movement from the c ase or while
disassembling the parts during repair work,
be sure to pull out the crown to the f ir st
click, and then, remove the SETTING STEM
while pushin g t he set ti ng le ver. Ref er to
page 9 for further details.

[24 HOUR INDICATOR MECHANISM]

PARTS LIST

Cal. 7T04A

5/21

11 CALENDAR PLATE

0712505

12 CALENDAR CORRECTOR

WHEEL
0737505

13 24 HOUR WHEEL

1002534

14 INTERMEDIATE WHEEL

FOR 24 HOUR WHEEL
0817536

16 24 HOUR WHEEL PLATE

4288500

19 1ST INTERMDEIATE

WHEEL CALENDAR
0962505

10 CALENDAR PLATE

SCREW
0012354

18 2ND INTERMEDIATE

WHEEL FOR CALENDAR
0962504

20 HOUR WHEEL

0271636

15 PIN FOR 24 HOUR

WHEEL PLATE
0027973

17 3RD INTERMEDIATE

WHEEL FOR CALENDAR
0962504

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

Cal. 7T04A

PARTS LIST

6/21

0022230

4225576

0022459

4457814

0396580

4000727

4270710

0125577

0888501

0241583

0261580

0950590

0902500

0027974

0240571

0231580

0701581

0885590

0885591

0022230

0022459

21

22

23

24

25

26

27

28

30

31

33

29

32

34

35

36

37

38

39

40

BATTERY CLAMP SCREW

BATTERY CLAMP

BATTERY (SR927SW)

CIRCUIT BLOCK COVER SCREW

CIRCUIT BLOCK COVER

FRICTIOIN SPRING FOR
SECONDS COUNTING

CIRCUIT BLOCK

BATTERY CONNECTION (-)

TRAIN WHEEL BRIDGE

SECONDS COUNTING WHEEL

FOURTH WHEEL

MINUTE WHEEL

MINUTE COUNTING
INTERMEDIATE WHEEL

MINUTE COUNTING WHEEL

PIN FOR TRAIN WHEEL BRIDGE

SMALL SECONDS WHEEL

THIRD WHEEL

FIFTH WHEEL

SECONDS COUNTING
1ST INTERMIDIATE WHEEL

SECONDS COUNTING
2ND INTERMIDIATE WHEEL

BATTERY CLAMP SCREW

CIRCUIT BLOCK COVER
SCREW

[GEAR TRAIN MECHANISM]

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

PARTS LIST

Cal. 7T04A

7/21

47

53

57

58

ROTOR FOR
SECONDS COUNTING
4146710

CLUTCH WHEEL
0282585

ROTOR STATOR
4239710

ROTOR STATOR FOR
SECONDS COUNTING
4239717

41

42

COIL BLOCK
4002700

COIL BLOCK FOR
MINUTE COUNTING
4002711

COIL BLOCK FOR
SECONDS COUNTING
4002700

44

45

46

48

49

50

51

52

54

55

56

59

60

61

ROTOR FOR
MINUTE COUNTING
4146710

SWITCH LEVER FOR START/
STOP BUTTON
4450703

SETTING LEVER
0383592

YOKE
0384582

SETTING WHEEL
0281580

SETTING STEM
0351583

ROTOR
4146710

SPACER FOR CENTER WHEEL
4283581

CENTER WHEEL
0221604

TRAIN WHEEL SETTING
LEVER
0391591

ROTOR STATOR FOR
MINUTE COUNTING
4239712

SWITCH LEVER FOR
RESET BUTTON
4450701

MAIN PLATE
0100573

SPACER B
0439594

43

[SETTING MECHANISM/STEPPING MOTORS

(STATORS AND COIL BLOCKS)]

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