Seiko Cal. 5M42A, 5M43A Parts Catalogue and Technical Guide
Parts catalogue and technical guide for Seiko automatic watch movements Cal. 5M42A and 5M43A. This service manual covers the complete movement architecture with detailed exploded diagrams showing all component positions and relationships. The parts list references every component by Seiko's factory numbering system for accurate identification during repair and maintenance work. Technical specifications detail the 27.6 mm outside diameter, 4.3 mm height, 6 jewels, and the signature step motor design with load-compensated driving pulse. The repair guide walks through disassembly and reassembly sequences, critical lubrication points and schedules, and includes technical remarks addressing circuit block structure, dial-holding ring installation, oscillating weight adjustment procedure, capacitor unit positioning, train wheel bridge alignment, and electrical resistance measurements. An essential workshop manual for service technicians working with these quartz movements.
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Document Details
- Format
- Pages
- 12
- Size
- 315.2 KB
- Category
- Watchmaking