Seiko 4T57A Technical Manual & Parts Catalogue
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Seiko 4T57A Technical Manual & Parts Catalogue

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PARTS LIST/ TECHNICAL GUIDE
ANALOGUE QUARTZ Cal. 4T57A
[SPECIFICATIONS]
Item
•　3 Hands (Hour, Minute, Second)
•　Chronograph (Minute, Second, 1/10 second)
•　Calendar
Interval of hands movement
Driving system
Additional function
Normal position
C r o w n
operation
1st click position
2nd click position
Loss/gain
Regulation system
Gate time for rate measurement
Current consumption
Coil resistance
Power
Battery No.
supply
Battery voltage
Battery life
Number of jewels
Cal. No.
1 second
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)
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
4T57A
•　Diameter
Outside : Ø29.50 mm (12H - 6H) × 26.00 mm
Casing: Ø28.80 mm (12H - 6H)
• Height: 4.57 mm
1/11

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Summary of Contents for Seiko 4T57A

  • Page 1 PARTS LIST/ TECHNICAL GUIDE ANALOGUE QUARTZ Cal. 4T57A [SPECIFICATIONS] Cal. No. 4T57A Item •　3 Hands (Hour, Minute, Second) •　Diameter •　Chronograph (Minute, Second, 1/10 second) Outside : Ø29.50 mm (12H - 6H) × 26.00 mm Casing: Ø28.80 mm (12H - 6H) •　Calendar...

  • Page 2: Parts List

    PARTS LIST Cal. 4T57A Types of oil Oil quantity Order of disassembly: AO-3 Normal quantity AO-2 Order of assembly: AUxILIARy TRAIN WHEEl BRIdgE ScREW 0012 079 HOuR, mINuTE dATE dIAl guARd 0808 368 SEcONd HANdS HOuR, mINuTE SEcONd HANdS dATE dIAl...
  • Page 3 PARTS LIST Cal. 4T57A BATTERy WINdINg STEm 0351 892 SWITcH SpRINg ScREW 0012 079 SWITcH SpRINg ScREW 0012 079 SWITcH SpRINg 4250 064 CIRCUIT BLOCK 4004 259 TRAIN WHEEl BRIdgE (B) ScREW 0012 079 TRAIN WHEEl BRIdgE (B) BATTERy cONNEcTION(-)
  • Page 4 PARTS LIST Cal. 4T57A TRAIN WHEEl BRIdgE (A) 0125 248 fOuRTH WHEEl ANd pINION 0241 178 THIRd WHEEl ANd pINION 0231 904 fIfTH WHEEl ANd pINION (A) 0701 904 STEp ROTOR (A) 4146 890 mINuTE WHEEl ANd pINION 0261 150...
  • Page 5 PARTS LIST Cal. 4T57A l Tools and consumables required for disassembling/reassembling • Movement holder uNIvERSAl mOvEmENT HOldER (S-682) • Watch oils SEIKO watch oils (AO-3 and AO-2) AO-2 AO-3 Remarks dATE dIAl Position of Position of Color of Part code...
  • Page 6 TECHNICAL GUIDE Cal. 4T57A 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 bat- tery is reinstalled following the repairing procedures, be sure...

  • Page 7: How To Install

    TECHNICAL GUIDE Cal. 4T57A 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.
  • Page 8 (+) 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 SUP- ply v (= 1.55 v) &...
  • Page 9 TECHNICAL GUIDE Cal. 4T57A [Structure of the CIRCUIT BLOCK] C=MOS=IC Input terminal (-) Input terminal (+) Output terminal(CG) Crystal unit 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.

  • Page 10: Time Setting

    TECHNICAL GUIDE Cal. 4T57A DISPLAY AND CROWN/BUTTON OPERATION Stopwatch 1/10 second hand (moves in 1/10 second increments) Minute hand Hour hand Bu t ton "A" in s topwa tch function: Start/Stop Stopwatch minute hand (moves in minute increments) First click: Date setting...

  • Page 11: Technical Guide

    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.)

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