Seiko 4T57A Technical Manual & Parts Catalogue Download Page 9

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Cal. 4T57A

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TECHNICAL GUIDE

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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 K

– 1.2 K

1.28 K

– 1.48 K

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

Summary of Contents for 4T57A

Page 1: ...and Calendar Stopwatch 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 Mi...

Page 2: ...ronograph minute wheel 0886 003 21 Chronograph second wheel 0888 009 2 Hour wheel 0271 407 2 Hour minute and second hands 8 Date corrector wheel 0806 368 18 Chronograph minute wheel 0902 008 19 Interm...

Page 3: ...28 battery CONNECTION 4270 358 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 35 Train wheel bridge B screw 0012 079 36 Train wheel...

Page 4: ...81 904 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 CORR...

Page 5: ...vement holder UNIVERSAL MOVEMENT HOLDER S 682 Watch oils SEIKO watch oils AO 3 and AO 2 AO 3 AO 2 Remarks Color of background White Black 3 o clock 3 o clock Position of crown 3 o clock 3 o clock Posi...

Page 6: ...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...

Page 7: ...ll 31 SETTING stem Reference The power of press hands Minute Hour Hands 5kg Second Hand 5kg Chrono Minute Second Hands 3kg 23 BATTERY While pushing the indented portion of the arrow pull out the setti...

Page 8: ...tained and then read the measurement 4 Make sure the read value is less than 2 2 A How to measure the current consumption for the whole movement How to measure the current consumption for the CIRCUIT...

Page 9: ...e resistance of each coil block if they are within the range in the following table 1 0 K 1 2 K 1 28 K 1 48 K COIL BLOCK A COIL BLOCK B 4002904 4002923 Structure of the CIRCUIT BLOCK Input terminal In...

Page 10: ...pped 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...

Page 11: ...TOPWATCH A B A Stopwatch 1 10 second hand STOP RESET Game over Accumulated elapsed time measurement Ex Basketball game Press the buttons in the following order A A A A B START STOP Start of game Time...