PARTS LIST/ TECHNICAL GUIDE

ANALOGUE QUARTZ Cal. 4T57A

[SPECIFICATIONS]

Cal. No.

Item

4T57A

•

　3 Hands (Hour, Minute, Second)

•

　Chronograph (Minute, Second, 1/10 second)

•

　Calendar

•

　Diameter

Outside : Ø29.50 mm (12H - 6H) × 26.00 mm

• Height: 4.57 mm

Interval of hands movement

1 second

Driving system

Additional function

C r o w n operation

Normal position

1st click position

2nd click position

Loss/gain

Two pole stepping motor, Step motor 3 pieces

• Electronic circuit reset switch

• Train wheel setting device

• [Time]

Indicated by the Hour, Minute, Second and Calendar

• [Stopwatch]

Up to 1 minutes in 1/10 second (2 seconds per round)

Up to 60 minutes in 1 second split time

Free

Date setting(clockwise)

Time setting, hand position adjustment / resetting the circuit

Monthly rate: Less than 20 seconds (at normal temperature range)

Regulation system

Gate time for rate measurement

Current consumption

Coil resistance

Power supply

Battery No.

Battery voltage

Battery life

Number of jewels

Nil

Use 10-second gate

Movement: Less than 2.20 μA

Circuit block: Less than 1.04 μA

4002004 (COIL BLOCK A)

1.0 - 1.2 KΩ

4002923 (COIL BLOCK B)

1.28 - 1.48 KΩ

SEIKO SR920SW(SEIZAIKEN) Silver oxide battery

1.55 V

Approx. 2 years

0 jewels

1/11

PARTS LIST

Order of disassembly: 1

Order of assembly: 55

55

1

Types of oil

AO-3

AO-2

Oil quantity

1 HOuR, mINuTE

AND

SEcONd HANdS

2 HOuR, mINuTE

AND

SEcONd HANdS

Cal. 4T57A

Normal quantity

4 AUxILIARy TRAIN

WHEEl BRIdgE ScREW

0012 079

5 dATE dIAl guARd

0808 368

6 dATE dIAl

3 DIAL

7 AuxIlIARy TRAIN WHEEl

BRIdgE

0126 368

8 dATE cORREcTOR

WHEEl

0806 368

15 CHRONOGRAPH

SEcONd WHEEl

0888 009

16 INTERmEdIATE

CHRONOGRAPH

SEcONd WHEEl

0885 002

17 INTERmEdIATE

CHRONOGRAPH mINuTE WHEEl

0886 003

18 CHRONOGRAPH mINuTE WHEEl

0902 008

19 INTERmEdIATE cHRONOgRApH mINuTE

WHEEl ANd pINION

0886 001

2 HOuR WHEEl

0271 407

9 dATE jumpER

0810 368

10 Date driving wheel

0802 368

11 INTERmEdIATE dATE dRIvINg

WHEEl

0817 368

12 INTERmEdIATE WHEEl fOR dATE cORREcTOR HOldER

0836 369

13 INTERmEdIATE WHEEl fOR dATE cORREcTOR (c)

0737 891

14 INTERmEdIATE WHEEl fOR dATE cORREcTOR (B)

0962 891

20 INTERmEdIATE cHRONOgRApH

SEcONd WHEEl

0885 002

21 CHRONOGRAPH

SEcONd WHEEl

0888 009

*All parts code are subject to change without notice.

2/11

PARTS LIST

25 SWITcH SpRINg ScREW

0012 079

29 TRAIN WHEEl BRIdgE (B) ScREW

0012 079

30 TRAIN WHEEl BRIdgE (B)

0125 331

31 fIfTH WHEEl ANd

PINION (B)

0701 014

32 STEp ROTOR (B)

4146 177

33 COIL BLOCK (B)

4002 923

34 ROTOR STATOR (B)

4239 357

Cal. 4T57A

23 BATTERy

24 WINdINg STEm

0351 892

25 SWITcH SpRINg ScREW

0012 079

26 SWITcH SpRINg

4250 064

27 CIRCUIT BLOCK

4004 259

28 BATTERy cONNEcTION(-)

4270 358

35 TRAIN WHEEl BRIdgE (B) ScREW

0012 079

36 TRAIN WHEEl BRIdgE (B)

0125 331

37 STEp ROTOR (B)

4146 177

38 COIL BLOCK (B)

4002 923

39 ROTOR STATOR (B)

4239 357

40 fIfTH WHEEl ANd pINION (B)

0701 014

*All parts code are subject to change without notice.

3/11

PARTS LIST

*1

*1

Cal. 4T57A

41 TRAIN WHEEl BRIdgE (A)

0125 248

42 fOuRTH WHEEl ANd pINION

0241 178

43 THIRd WHEEl ANd pINION

0231 904

44 fIfTH WHEEl ANd pINION (A)

0701 904

45 STEp ROTOR (A)

4146 890

46 mINuTE WHEEl ANd pINION

0261 150

47 cENTER WHEEl ANd pINION

0221 157

48 SETTINg WHEEl

0281 904

49 COIL BLOCK (A)

4002 904

50 ROTOR STATOR (A)

4239 357

51 TRAIN WHEEl SETTINg lEvER

0391 368

52 SETTINg lEvER

0383 368

53 yOKE

0384 470

54 cluTcH WHEEl

0282 890

55 INTERmEdIATE WHEEl fOR dATE cORREcTOR (A)

0962 890

*All parts code are subject to change without notice.

4/11

PARTS LIST

l

Tools and consumables required for disassembling/reassembling

• Movement holder

uNIvERSAl mOvEmENT HOldER (S-682)

Cal. 4T57A

• Watch oils

SEIKO watch oils (AO-3 and AO-2)

AO-3

AO-2

Remarks

6 dATE dIAl

Part code

0878 220

0878 221

Position of crown

3 o’clock

3 o’clock

Position of calendar frame Color of figure

3 o’clock Black

3 o’clock White

Color of background

White

Black

5/11

TECHNICAL GUIDE

The explanation here is only for the particular point of cal.4T57A.

●

Remarks on installing the battery

1) After the battery is replaced with a new one, or after the battery is reinstalled following the repairing procedures, be sure to touch the AC terminal of circuit block and the switch spring with conductive tweezers to reset the circuit as illustrated at right.

Cal. 4T57A

2) When the battery is replaced with a new one, the information stored in the built-in Ic does not correspond with the time actually displayed. Before using the watch, therefore, be sure to reset the IC following the procedure below.

If any of the stopwatch hands should move improperly, also follow the same procedure.

1. Pull out the crown to the second click position.

2. Press the buttons “A” and “B” simultaneously for 2 seconds, and then, release the buttons. The stopwatch second hand turns counterclockwise and stopwatch 1/10 second hand turns clockwise, and then return to where they were.

3. Press button “A” or “B” to reset the stopwatch hands to ”0” position.

* By pressing button “A” , set the stopwatch 1/10 second hand.

* By pressing button “B”, set the stopwatch second and minute hands.

4. Turn the crown to set the hour, and minute and 24-hour hands to the desired time, and push the crown back to the normal position.

6/11

TECHNICAL GUIDE

1 HOuR, mINuTE ANd SEcONd HANdS

●

How to install

1. Place the movement directly on a movement holder or the like and press in the hands.

2. Install the hour, minute and second hands at the

“12”o’clock position.

3. Install the chrono minute and second hands at the

“0”o’clock position.

[ Reference ] The power of press hands

Minute & Hour Hands < 5kg

Second Hand < 5kg

Chrono Minute & Second Hands < 3kg

Cal. 4T57A

23 BATTERy

●

How to remove or install the battery

1) Remove the hook of the switch spring's battery clamp.

2) Insert the battery sideways, and have the hook of the switch spring's battery clamp catch the main plate.

16 Switch spring

1) When Removing

Battery clamp

Main plate

2) When Installing

31 SETTINg STEm

●

How to remove

While pushing the indented portion of the arrow, pull out the setting stem.

Push

7/11

TECHNICAL GUIDE

REMARKS ON INSPECTION AND MEASUREMENT

●

How to measure the current consumption for the whole movement

1. To measure the current consumption for the whole movement, connect the (-) probe to the battery connection (-) and (+) probe to the other metal part of the movement, such as battery clamp or circuit block cover.

* When measuring the current consumption using the SEIKO digital multi-tester (S-860), use the range of 40 μ A of SUPply v (= 1.55 v) & gATE TImE (2 S).

2. Connect the AC component to the positive terminal for 2 seconds until a short circuit occurs to reset the integrated circuit.

3. After the integrated circuit is reset, wait approximately for

10 seconds until a stable measurement is obtained, and then read the measurement.

4. Make sure the read value is less than 2.2 μ A.

Cal. 4T57A

●

How to measure the current consumption for the CIRCUIT BLOCK alone

1. To measure the current consumption for the CIRCUIT BLOCK alone, connect each probe to the appropriate positive (+) or negative (-) input terminal of the CIRCUIT BLOCK (please refer to “Structure of the CIRCUIT BLOCK” below).

* When measuring the current consumption using the SEIKO

Multi-Tester S-860, use the range of 4 μ A of SUPPLy V (= 1.55 v) & gATE TImE (2 S).

2. Repeat the same procedures as 2. and 3. of measuring current consumption for the whole movement above.

* When measuring the current consumption for the circuit block alone, be careful not to damage or deform the pattern of the circuit block.

3. Make sure the read value is less than 1.04 μ A.

8/11

TECHNICAL GUIDE

[Structure of the CIRCUIT BLOCK]

Crystal unit

Output terminal(CG)

Cal. 4T57A

C=MOS=IC

Input terminal (-)

Input terminal (+)

Output terminal(hand moving)

●

Value checking – coil resistance (coil blocks)

Check the resistance of each coil block if they are within the range in the following table.

COIL BLOCK (A)

COIL BLOCK (B)

4002904

4002923

1.0 KΩ – 1.2 KΩ

1.28 KΩ – 1.48 KΩ

9/11

TECHNICAL GUIDE

Cal. 4T57A

DISPLAY AND CROWN/BUTTON OPERATION

Hour hand

Stopwatch 1/10 second hand (moves in 1/10 second increments)

Minute hand

But ton "A" in stopwatch function: Start/Stop

Stopwatch minute hand

(moves in minute increments)

First click: Date setting

Second click: Time setting

Second hand

Stopwatch second hand (moves in second increments)

Crown at normal position

Button "B" in stopwatch function:

Split/Slit release/Reset

* The measurement time indicated by the stopwatch hands that move independently of center hands.

* Stopwatch 1/10 second hand moves for a first minute. After one minute, it indicates the measurement time when it is stopped.

TIME SETTING

1. Pull out the crown to the first click.

2. Turn the crown clockwise until the previous day’s date appears.

3. Pull out the crown to the second click when the second hand is at the 12 o’clock position.

It will stop on the spot and advance the hour and minute hands by turning the crown.

(Check that AM/PM is set correctly.)

* When the crown is at the second click position, do not press any button. Otherwise, the chronograph hands will move.

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

* Do not set the date between 9:00 P.M. and 1:00 A.M.

Otherwise, the day may not change properly. If it is necessary to set the date during that time period,

First change the time to any time outside it, set the date and then reset to the correct time.

10/11

TECHNICAL GUIDE

Cal. 4T57A

HOW TO USE THE STOPWATCH

• The measurement time is indicated by the stopwatch hands that move independently of the center hands.

• The stopwatch can measure up to 60 minutes in second. (The watch indicates the measurement time in second increments by ignoring off the 1/10 seconds obtained.)

Standard measurement

Ex) 100m race (press the buttons in the following order: A A B

START STOp (finish)

Stopwatch 1/10 second hand

RESET (Reset to “0’00”)

A

A

B

Stopwatch minute hand

Stopwatch second hand

Accumulated elapsed time measurement

9.8/10 seconds

Ex) Basketball game (press the buttons in the following order: A A

START STOP

(Start of game) (Time out)

RESTART

(Restart of game)

STOp

(Game over)

RESET

A

A A

5 minutes 10, 8/10 seconds 20 minutes 00 seconds

*Restart and stop of the stopwatch can be repeated as many times as necessary by pressing button A

Split time measurement

Ex) 5,000m race (press the buttons in the following order: A B/B A B

B

START

SPLIT/

SplIT RElEASE

STOp RESET

A

A

B

B

2 minutes 50 seconds 15 minutes 10 seconds

*Measurement and release of the split time can be repeated as many times as necessary by pressing button B.

11/11

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