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Parts Catalogue / TECHNICAL GUIDE
[SPECIFICATIONS]
Item
Movement
Movement size
Time indication
Driving system
Additional mechanism
Loss/gain
Regulation system
Measuring gate by quartz tester
Power supply
Operating voltage range
Duration of charge
Jewels
Cal. 5M42A
Cal. 5M43A
Cal. No.
The illustrations refer to Cal. 5M42A.
Outside diameter
ø27.6 mm
Casing diameter
ø27.0 mm
Height
4.3 mm
3 hands
Step motor (Load compensated driving pulse type)
• Automatic generating system
• Power reserve indicator
• Overcharge prevention function
• Electronic circuit reset switch
• Train wheel setting device
• Date calendar
• Day calendar (for Cal. 5M43A only)
• Instant setting device for date calendar
• Instant setting device for day calendar (for Cal. 5M43A only)
Monthly rate at normal temperature range: less than 15 seconds
Nil
Use 10-second gate.
Power generator
Automatic generating system
Capacitor
Polyacene lithium condenser
Capacitor voltage: 0.5 ~ 2.3V
From 1.55V to stoppage: Approx. 168 hours
6 jewels
5M42A
5M43A
(x 1.0)
1
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Related Manuals for Seiko 5M42A
Summary of Contents for Seiko 5M42A
- Page 1 PARTS CATALOGUE / TECHNICAL GUIDE Cal. 5M42A Cal. 5M43A [SPECIFICATIONS] Cal. No. 5M42A 5M43A Item Movement The illustrations refer to Cal. 5M42A. (x 1.0) Outside diameter ø27.6 mm Casing diameter ø27.0 mm Movement size Height 4.3 mm Time indication 3 hands...
- Page 2 PARTS CATALOGUE Cal. 5M42A, 5M43A → Disassembling procedures Figs. : → Reassembling procedures Figs. : Lubricating: Types of oil Oil quantity Moebius A Normal quantity SEIKO Watch Oil S-6 Ex.: Cal. 5M43A Hour, minute and second hands Dial Holding ring for dial...
- Page 3 PARTS CATALOGUE Cal. 5M42A, 5M43A 0022 490 Oscillating weight screw 0500 660 Oscillating weight 1002 662 Oscillating weight wheel 0022 247 Capacitor clamp screw _____ _____ _______ 4225 518 Capacitor clamp _____ SET COD E Rechargeable battery ______ 4216 509...
- Page 4 PARTS CATALOGUE Cal. 5M42A, 5M43A 0022 247 Train wheel bridge screw 0125 660 Train wheel bridge 0391 660 Train wheel setting lever 4271 515 Capacitor connection (+) 0241 670 Fourth wheel and pinion 0231 530 Third wheel and pinion 0701 670...
- Page 5 3 o’clock Black White 5M43A 0878 675 3 o’clock Black White The type of date dial is determined based on the design of cases. Check the case number and refer to “SEIKO Casing Parts Catalogue” to choose a corresponding date dial.
- Page 6 TECHNICAL GUIDE Cal. 5M42A, 5M43A • The explanation here is only for the particular points of Cal. 5M42A and 5M43A. • For the repairing, checking and measuring procedures, refer to the “TECHNICAL GUIDE, GENERAL INSTRUCTIONS”. STRUCTURE OF THE CIRCUIT BLOCK...
- Page 7 TECHNICAL GUIDE Cal. 5M42A, 5M43A Holding ring for dial If the watch is of the one-piece case type, the movement is fixed to the case in such a manner that the four hooking portions of the holding ring for dial catch the case.
- Page 8 TECHNICAL GUIDE Cal. 5M42A, 5M43A 16 Oscillating weight screw Tighten the oscillating weight screw very firmly, applying Oscillating weight screw more force than usual. 22 Capacitor unit • Though the capacitor unit for Cal. 5M4 Series is of a completely different type than that for Cal. 5M2 Series, they have a close resemblance in shape.
- Page 9 TECHNICAL GUIDE Cal. 5M42A, 5M43A Intermediate wheel for generating rotor 26 Oscillating weight bridge screw Oscillating weight bridge Generating rotor 27 Oscillating weight bridge • Before tightening the oscillating weight bridge screw, check that the upper pivot of the generating rotor is inserted properly.
- Page 10 TECHNICAL GUIDE Cal. 5M42A, 5M43A 36 Train wheel setting lever 44 Switch lever 45 Yoke 46 Setting lever 47 Lever for unlocking stem • Setting position and lubricating Refer to the illustration at right. Train wheel setting lever Lever for unlocking stem...
- Page 11 TECHNICAL GUIDE Cal. 5M42A, 5M43A • Measuring the current consumption for the whole movement 1) Connect the tester as shown in the illustration. – – MA-40A – S-840A 2) Start the measurement 30 to 40 seconds after connecting the tester, checking that a stable measure- ment is obtained.
- Page 12 Cal. 5M42A and 5M43A are so designed that the capacitor can be charged up to 2.2V. Even if the watch is fully charged, however, the power reserve indicator can only indicate that the capacitor voltage is more than 1.55V, which corresponds to 7 days of duration of charge, with the second hand...
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