Seiko YT57B Technical Manual Download Page 4

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PARTS CATALOGUE

Cal. YT57B

➡

Please see the remarks on the following pages.
Lubricating of some parts is shown in “II. REMARKS ON DISASSEMBLING AND REASSEMBLING”.

Winding stem

0282 672
Clutch wheel

0221 676
Center wheel and pinion

0100 669
Main plate

4239 518
Rotor stator

0022 247
Train wheel bridge screw

0125 661
Train wheel bridge

0391 660
Train wheel setting lever

4271 515
Rechargeable battery
connection (+)

0241 670
Fourth wheel and pinion

0231 530
Third wheel and pinion

0701 670
Fifth wheel and pinion

4146 531
Step rotor

0261 670
Minute wheel

0281 670
Setting wheel

0384 661
Yoke

0383 662
Setting lever

Summary of Contents for YT57B

Page 1: ...ng pulse type Loss gain Monthly rate at normal temperature range less than 20 seconds Regulation system Nil Measuring gate by quartz tester Use 10 second gate Power supply Automatic generating system...

Page 2: ...te dial guard screw 3 pcs Rechargeable battery clamp screw 2 pcs Circuit block cover screw 2 pcs Oscillating weight bridge screw 2 pcs Coil block screw 1 pc Train wheel bridge screw 1 pc 0022 490 Osci...

Page 3: ...519 Insulator for rechargeable battery 18 3023 24T Rechargeable battery unit 19 0022 247 Circuit block cover screw 20 4457 760 Circuit block cover 21 4000 734 Circuit block 14 1002 662 Oscillating wei...

Page 4: ...pinion 47 0100 669 Main plate 43 4239 518 Rotor stator 31 0022 247 Train wheel bridge screw 32 0125 661 Train wheel bridge 33 0391 660 Train wheel setting lever 34 4271 515 Rechargeable battery connec...

Page 5: ...ermined based on the design of cases Check the case number and refer to SEIKO Casing Parts Catalogue to choose a corresponding date dial 44 Winding stem 0351 653 The type of winding stem is determined...

Page 6: ...18 Rechargeable battery unit Though they have a close resemblance in shape the rechargeable battery unit for Cal YT57B is of a completely different type from that for Cal 5M6 Series They can be discri...

Page 7: ...n Minus lead terminal Rechargeable battery plus terminal B portion 20 Circuit block cover Circuit block cover for after sales servicing use has no such marks printed on it as calibre number and numera...

Page 8: ...rotor Generating rotor 25 Generating coil block The generating coil block for Cal YT57B and that for Cal 5M4 Series have a close resemblance in shape They can be discriminated by the size of the patte...

Page 9: ...lubrication of the respective wheels Lubricating Moebius A Moebius F Fifth wheel and pinion Step rotor Setting wheel Fourth wheel and pinion Minute wheel Third wheel and pinion Center wheel and pinio...

Page 10: ...whole movement Less than 0 80 A with 1 55 V supplied from a battery For the circuit block alone Less than 0 20 A with 1 55 V supplied from a battery 1 Make the movement ready for measurement How to me...

Page 11: ...ent mode 4 After checking that the IC has been switched to the normal hand movement mode and a stable measurement can be obtained read the measurement If the measurement value remains high or unstable...

Page 12: ...hin 3 minutes after swinging the watch measure the voltage of the rechargeable battery in the same manner as in step 1 above 4 Refer to the table below and decide whether the automatic generating syst...