Seiko 4T57A Installationshandbuch

[SPECIFICATIONS]

1/11

PARTS LIST/TECHNICALGUIDE

ANALOGUE QUARTZ Cal. 4T57A

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

C r o w n

operation

Normal position

1st click position

2nd click position

Current consumption

Coil resistance

4T57A

 

 

 

Indicated by the Hour, Minute, Second and Calendar

 

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

Up to 60 minutes in 1 second split time

Two pole stepping motor, Step motor 3 pieces

　3 Hands (Hour, Minute, Second)

　Chronograph (Minute, Second, 1/10 second)

　Calendar

Use 10-second gate

0 jewels

　Diameter

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

Casing: Ø28.80 mm (12H - 6H)

 

4.57 mm

1 second

Free

Date setting(clockwise)

Time setting, hand position adjustment / resetting the circuit

Nil

Movement: Less than 2.20 µA

Circuit block: Less than 1.04 µA

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

4002004 (COIL BLOCK A)

1.0 - 1.2 KΩ

4002923 (COIL BLOCK B)

1.28 - 1.48 KΩ



1.55 V



Cal. 4T57A

2/11

PARTS LIST

  

AND

  

10 Date driving wheel

0802 368

3 DIAL

  

  

0817 368

  

  

0836 369

15 CHRONOGRAPH

  

0888 009

                           

  

0962 891

  

CHRONOGRAPH

  

0885 002   

  

0737 891

   

CHRONOGRAPH

  

0886 003

21 CHRONOGRAPH

  

0888 009

  

0271 407

  

AND

  

  

  

0806 368

18 CHRONOGRAPH

  

0902 008

   

  

  

0886 001

  

  

0885 002

                      

  

0126 368

4 AUXILIARY TRAIN

  

0012 079

  

0808 368

Order of disassembly: 1 55

Order of assembly: 55 1

Types of oil

AO-3

AO-2

Oil quantity

Normal quantity

  

  

0810 368

*All parts code are subject to change without notice.

Cal. 4T57A

3/11

PARTS LIST

  

  

0351 892

  

0012 079

  

4250 064

27 CIRCUIT BLOCK

4004 259

  

0012 079

  

0125 331   

4270 358

  

PINION (B)

0701 014

  

4146 177

33 COIL BLOCK (B)

4002 923

34 ROTOR STATOR (B)

4239 357

  

0012 079

  

0125 331

  

4146 177

38 COIL BLOCK (B)

4002 923

39 ROTOR STATOR (B)

4239 357

  

0701 014

  

0012 079

*All parts code are subject to change without notice.

Cal. 4T57A

4/11

PARTS LIST

  

0241 178

  

0231 904

  

0701 904

  

4146 890

  

0281 904

49 COIL BLOCK (A)

4002 904

50 ROTOR STATOR (A)

4239 357

  

0391 368

  

0383 368

  

0384 470

  

0282 890

                       

   

0962 890

  

0261 150

  

0125 248

*All parts code are subject to change without notice.

  

0221 157

Cal. 4T57A

5/11

PARTS LIST

lTools and consumables required for disassembling/reassembling

•Movement holder

   

• Watch oils



AO-3 AO-2

Remarks

Color of

background



Black

3 o’clock

Position of

crown

3 o’clock

Position of

calendar frame Color of ﬁgure

Black



Part code

0878 220

0878 221

  

Cal. 4T57A

6/11

TECHNICAL GUIDE

   -

spond with the time actually displayed. Before using the watch, therefore, be sure to reset the IC follow-

ing 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 po-

sition.



●Remarks on installing the battery

1) After the battery is replaced with a new one, or after the bat-

tery 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

7/11

TECHNICAL GUIDE

  

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.

●How to install

 

[ Reference ] The power of press hands

Minute & Hour Hands < 5kg

Second Hand < 5kg

Chrono Minute & Second Hands < 3kg

   

      

arrow, pull out the setting stem.

●How to remove

Push

●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.

Battery clamp

Main plate

1) When Removing 2) When Installing

16 Switch spring

Cal. 4T57A

8/11

TECHNICAL GUIDE

 REMARKSONINSPECTIONANDMEASUREMENT

1. To measure the current consumption for the whole move-

ment, 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.



digital multi-tester (S-860), use the range of 40 µ A of SUP-



2. Connect the AC component to the positive terminal for 2

seconds until a short circuit occurs to reset the integrated

circuit.



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.

●How to measure the current consumption for the whole movement

●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 re-

fer to “Structure of the CIRCUIT BLOCK” below).



Multi-Tester S-860, use the range of 4 µ A of SUPPLY V (= 1.55



2. Repeat the same procedures as 2. and 3. of measuring cur-

rent consumption for the whole movement above.

       

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.

Cal. 4T57A

9/11

TECHNICAL GUIDE

●Value checking – coil resistance (coil blocks)

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

1.0 KΩ– 1.2 KΩ

1.28 KΩ– 1.48 KΩ

COIL BLOCK (A)

COIL BLOCK (B)

4002904

4002923

[Structure of the CIRCUIT BLOCK]

Input terminal (+)

Input terminal (-)

Output terminal(hand moving)

Crystal unit

Output terminal(CG)

C=MOS=IC

Cal. 4T57A

10/11

TECHNICAL GUIDE

Minute hand

Hour hand

Stopwatch minute hand (moves

in minute increments)

Second hand

Stopwatch second hand (moves

in second increments)

Stopwatch 1/10 second hand (moves

in 1/10 second increments)

But ton "A" in stopwatch

function: Start/Stop

First click: Date setting

Second click: Time setting

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.

 DISPLAYANDCROWN/BUTTONOPERATION

2. Turn the crown clock-

wise 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.)

     

the second click posi-

tion, do not press any

button. Otherwise, the

chronograph hands

will move.

1. Pull out the crown to

the ﬁrst click.

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.

 TIMESETTING

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