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Parts Catalogue / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
Movement
Movement
Outside diameter
size
Casing diameter
Height
Time indication
Driving system
Additional mechanism
Loss/gain
Regulation system
Measuring gate by quartz tester
Power
Power generator
supply
KINETIC E.S.U.
Operating voltage range
Duration of charge
Jewels
Cal. YT57B
Cal. No.
ø27.6 mm
ø27.0 mm
4.3 mm
Step motor (Load compensated driving pulse type)
• Automatic generating system
• Energy depletion forewarning function
• Overcharge prevention function
• Electronic circuit reset switch
• Train wheel setting device
• Date calendar
• Instant setting device for date calendar
Monthly rate at normal temperature range: less than 20 seconds
Nil
Use 10-second gate.
Automatic generating system
Titanium lithium ion rechargeable battery
0.45 V ~ 2.2 V
From full charge to stoppage: Approx. 6 months
6 jewels
YT57B
(x 1.0)
1
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Summary of Contents for Seiko YT57B
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. YT57B [SPECIFICATIONS] Cal. No. YT57B Item Movement (x 1.0) Movement Outside diameter ø27.6 mm size Casing diameter ø27.0 mm Height 4.3 mm Time indication 3 hands Driving system Step motor (Load compensated driving pulse type) Additional mechanism •...
- Page 2 → Reassembling procedures Figs. : Lubricating: Types of oil Oil quantity Moebius A Normal quantity Moebius F SEIKO Watch Oil S-6 Hour, minute and second hands Dial Holding ring for dial 0022 247 Date dial guard screw 0808 660 Date dial guard...
- Page 3 PARTS CATALOGUE Cal. YT57B 0022 490 Oscillating weight screw 0500 661 Oscillating weight 1002 662 Oscillating weight wheel 0022 247 Rechargeable battery clamp screw 4225 519 Rechargeable battery clamp 4216 519 Insulator for rechargeable battery 3023 24T Rechargeable battery unit...
- Page 4 PARTS CATALOGUE Cal. YT57B 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...
- Page 5 Holding ring for dial 0866 636 The type of holding ring for dial is determined based on the design of cases. Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding holding ring for dial. Date dial...
- 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 discriminated in the point that the latter has a hole for discrimination on its minus lead terminal while the former doesn’t as illustrated...
- Page 7 Circuit block The circuit block for Cal. YT57B and that for Cal. 5M6 Series have a close resemblance in shape. They can be discriminated in the point that the former has a hole for discrimination while the latter doesn’t as illustrated below.
- Page 8 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 pattern on the lead terminal. If the generating coil block for Cal.
- Page 9 TECHNICAL GUIDE Cal. YT57B Fourth wheel and pinion Third wheel and pinion Fifth wheel and pinion Step rotor Minute wheel Setting wheel Center wheel and pinion • Setting position and lubricating Refer to the illustrations below for the setting position and lubrication of the respective wheels.
- Page 10 2) Temporarily tighten the screw “A” in the illustration, taking care not to tighten it excessively. 3) Install the oscillating weight wheel and oscillating weight and then tighten the oscillating weight screw. Screw “A” Lubricating: : Moebius A : SEIKO Watch Oil S-6...
- Page 11 TECHNICAL GUIDE Cal. YT57B Apply the minus terminal to “a” portion of the input terminal (–) in the illustration and plus terminal to the circuit block cover, respectively. Circuit block cover “a” portion For a few seconds after the probes of the tester...
- Page 12 TECHNICAL GUIDE Cal. YT57B With the tester connected to the circuit block, short-circuit “A” portion in the illustration and the input terminal (–) with conductive tweezers or the like for more than 3 seconds. The IC will be switched from the quick start to the normal hand movement mode.
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