Seiko V172A, V174A, V175A Technical Manual

PARTS LIST / TECHNICAL GUIDE

ANALOGUE SOLAR Cal. V172A/V174A

[SPECIFICATIONS]

1/24

Item

Cal. No.

V172A/V174A

Power reserve

Driving system

Additional function

Crown operation

Loss/Gain

Regulation system

Number of jewels

Normal position

1st click position

Current consumption

Gate time for rate measurement

Power
supply

Motion of the second hand

Coil resistance

Power generator

Rechargeable battery

Operating voltage range

2nd click position

One-second intervals

Stepping motor 4 pieces

Diame ter: Outside 27.6 mm
Ca sing 27.0 mm
Height: 4.4 mm

3 hands

(hour, minute and small

second hands)

Energy depletion forewarning function (The second hand moves at two­second intervals.)
Overcharge prevention function
Electronic circuit reset function
Second hand stop function
Date calendar
Instant setting device for date calendar
System reset function

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

(Auto stop measuring at 60 minutes)
Accumulated elapsed time measurement
Split time measurement
Single-time alarm function
Stopwatch hand position adjustment

Stopwatch

Time setting, System reset, Setting “0” of stopwatch hand

Monthly rate: less than 15 seconds (worn on the wrist at temperature range
between 5 to 35 degrees Centigrade)

Use 10-second gate

Nil

Solar power generation system

Movement: less than 0.80 μA

Circuit block: less than 0.40 μA

4002 541 1.90 - 2.30 kΩ
(COIL BLOCK) (COIL BLOCK FOR STOPWATCH SECOND)
4002 542 1.75 - 2.15 kΩ
(COIL BLOCK FOR STOPWATCH MINUTE) (COIL BLOCK FOR ALARM)

MT920 Manganese titanium lithium rechargeable bat tery

0.90V - 2.10V

From full charge to stoppage: Approximately 6 months

Nil

V172A V174A

Date setting (counter clock wise) , Time set ting of alarm

3 hands

(hour, minu te and small s econd

hands), 24-hour indicator

SPECIFICATIONS

2/24

Cal. V172A/V174A

FEATURE S

The Cal. V172A /V174A are analogue chronograph watches with a solar power generation system.

l Solar power generation system

The watch operates while charging electricity by converting light received on the dial to
electrical energy. It lasts for 6 months after full charge.

l Energy depletion forewarning function

When the energy stored in the rechargeable battery is reduced to an extremely low level, the

second hand starts moving at 2-second intervals instead of the normal 1-second intervals.

l Guideline of charging time

Environment/Light source Illumination

(lux)

Time required
for full charge

Time required
for steady
operation

Time to charge
1 day of power

General offices/ Fluorescent
Light

700 - 60 hours 150 minutes

30W 20cm/Fluorescent light 3,000 110 hours 13 hours 33 minutes

30W 3cm/ Fluorescent light 10,000 30 hours 3.5 hours 9 minutes

Cloudy weather/Sunlight 10,000 30 hours 3.5 hours 8 minutes

Fair weather/Sunlight 100,000 5 hours 0.6 hours 2 minutes

The above table provides only a general guideline.

It is recommended that the watch be charged for as long as the charging time according to the
column "Time required for steady operation" in this table in order to assure the stable movement
of the watch.

l Caution for charging

When charging the watch, do not place it too close to a photo flash light, spotlight, incandescent
light or other light sources as the watch temperature will become extremely high, causing damage
to the parts inside the watch.

When exposing the watch to sunlight to charge it, do not leave it on the dashboard of a car, etc.
for a long time, as the watch temperature becomes extremely high.

While charging the watch, make sure the watch temperature does not exceed 60 °C.

Order of disassembly: 1
Order of assembly:

　　1

Lubricating:
Types of oil Oil quantity
AO-3 Normal quantity

1

HOUR, MINUTE

AND SM ALL
SECOND HANDS,

24- HOUR HAND

(V174A)

2

DIAL

CASE BACK

3

SPACER FOR

SOLAR CELL
4453 500

4

SOLAR CELL
4025 556(CAL.V172A)
40 25 557( CAL .V 174A)

5 HOLDING RING FOR DIAL
0866 ***

6

CONTACT POINT SPRING
2PCS.
4281 516

AO-2

PIEZOELECTRIC ELEMENT 4589 801

CASE BACK GASKE T

MOVEMENT

CASE

CROWN

69

69

PARTS LIST

Cal. V172A/V174A

3/24

19

THIRD INTERMEDIATE WHEEL

FOR CALENDAR CORRECTION
0962 504

17

GUIDE PLATE FIXING PIN FOR

24-HOUR WHEEL (V174A)
0027 973

10

DATE DRIVING WHEEL

0802 582

7

DATE DIAL GUARD
S C R E W（ 2 P C S . ）

0012 354

8

DATE DIAL GUARD

0808 525

9

DATE DIAL

0878 ***

12

GUIDE PLATE FOR DATE DIAL

0712 507

14

CALENDAR CORRECTOR

SETTING WHEEL

0737 505

18

GUIED PLATE FOR 24-HOUR

WHEEL (V174A)

4488 500

20

SECOND INTERMEDIATE

WHEEL FOR CALENDAR
CORRECTION

0962 504

21

FIRST INTERMEDIATE

WHEEL FOR CALENDAR
CORRECTION

0962 580

11

GUIDE PLATE FOR DATE

DIAL SCREW

0012 354

13

ALARM HOUR WHEEL

0271 645

15

24-HOUR WHEEL (V174A)

1002 534

22

HOUR WHEEL

0271 636

16

INTERMEDIATE 24-HOUR

WHE EL ( V174A )

0817 536

Cal. V172A/V174A

PARTS LIST

4/24

23

RECHARGEABLE BATTERY

GUARD SCREW（3PCS.）

0022 230

29

SECOND HOLD SPRING

0396 580

31

BUZZER LEAD TERMINAL

4246 527

24

RECHARGEABLE BATTERY

G U A R D
4225 616（V172A）
42 25 644（V174 A）

25

RECHARGEABLE BATTERY

BLO CK
3023 24H

26

CIRCUIT BLOCK COVER

S C R E W（ 3 P C S . ）

0022 459

27

CIRCUIT BLOCK COVER

4461 532

28

CONDUCTING PLATE

4224 518

30

CIRCUIT BLOCK

4000 750

PARTS LIST

Cal. V172A/V174A

5/24

45

CENTER WHEEL FOR

ALARM

0902 502

42

MINUTE COUNTING WHEEL

0902 500

41

INTERMEDIATE MINUTE

COUNTING WHEEL
0950 590

39

FIRST INTERMEDIATE

SESOND COUNTING WHEEL

0885 590

32

PIN FOR TRAIN WHEEL

BRIDGE

0027 974

33

TRAIN WHEEL BRIDGE

0125 516

34

1/5-SECOND COUNTING

WHEEL

0888 501

36

FORTH WHEEL AND PINION

0241 583

37

THIRD WHEEL AND PINION

0231 580

40

SECOND INTERMEDIATE

1/5-SECOND COUNTING
WHEEL

0885 591

43

MINUTE WHEEL

0261 582

46

ALRAM MINUTE WHEEL

0261 582

35

SMALL SECOND WHEEL

0240 511

44

INTERMEDIATE ALARM

WHEEL

0950 590

38

FIFTH WHEEL AND PINION

0701 581

Cal. V172A/V174A

PARTS LIST

6/24

54

CHRONOGR APH ROTOR

FOR 1/5-SECOND

4146 710

50

COIL BLOCK FOR

CHRONOGRAPH
MINUTE 4002 542

48

COIL BLOCK

4002 541

49

COIL BLOCK FOR

CHRONOGR APH 1/5-SECOND

4002 541

53

R OTO R

4146 710

55

CHRONOGRAPH ROTOR

FOR MINUTE 4146 710

58

SETTING WHEEL

0281 580

60

CLUTCH WHEEL

0282 585

62

CENTER WHEEL SPRING

4283 581

65

STATOR

4239 710

66

STATOR FOR

CHRONOGRAPH
1/5 - SEC O ND
4239 717

67

STATOR FOR CHRONOGRAPH

MINUTE 4239 713

47

COIL BLOCK FOR ALARM

4002 542

52

ALARM ROTOR

4146 710

51

SWITCH LEVER A

4450 703

56

SETTING LEVER

0383 592

57

YOK E

0384 583

59

SETTING STEM

0351 586

61

TRAIN WHEEL SETTING

LEVER

0391 591

63

CENTER WHEEL AND

PINION

0221 604

64

STATOR FOR ALARM

4239 712

68

SWITCH LEVER B

4450 701

69

MAIN PLATE

0100 579

PARTS LIST

Cal. V172A/V174A

7/24

59

⑰ GUIDE PLATE FIXING PIN 0027 973
㉜TRAIN WHEEL BRIDGE FIXING PIN 0027 974

Refer to the following figures.

④ SOLAR CELL 4025 556 (V172A)/4025 557 (V174A)

⑰ GU ID E PL ATE FIXING PIN

FOR 24-HOUR WHEEL

0027 973

㉜TRAIN WHEEL BRIDGE

FIXING PIN
00 27 974

4025 556 (V172A)

4025 557 (V174A)

Cal. V172A/V174A

PARTS LIST

8/24

l

How to find the correct parts, if not determined by 4 digit caliber number

Following parts are determined based on the design of watches, such as hands height, dial color,

and design of cases. Please refer to the SEIKO WATCH PARTS CATALOGUE in order to choose

the corresponding parts.

 ⑤HOLDING RING FOR DIAL 0866 ***
 ⑨DATE DIAL 0878 ***

SETTING STEM 0351 586

The type of HOLDING RING FOR DIAL is determined based on the design of cases.

Check the case number and refer to the "SEIKO WATCH PARTS CATALOGUE" to choose the
corresponding parts.