Seiko YT57B Technical Manual Download Page 9

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TECHNICAL GUIDE

Cal. YT57B

Fourth wheel and pinion

Third wheel and pinion

Fifth wheel and pinion

Step rotor

Minute wheel

Setting wheel

•

Setting position and lubricating

Refer to the illustrations below for the setting position and 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 pinion

Step rotor

Fifth wheel

and pinion

Fourth wheel

and pinion

Third wheel

and pinion

Center wheel and pinion

Note: Be sure to observe the position, type of oil

and quantity of the lubrication specified in
the illustration.

Minute wheel

Setting wheel

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...

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Seiko YT57B, Technical Manual

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