Service Guide for Cal. W204A and Cal. W207A Watches
Seiko service guide covering two LCD quartz watch calibers: the Cal. W204A and Cal. W207A. The Cal. W204A features a nematic liquid crystal display showing time, calendar, and seconds, with automatic calendar function and ø18.5mm module diameter. The Cal. W207A offers a broader feature set including time, 24-hour mode, stopwatch, and alarm functions plus hourly chime, housed in a ø18.7mm module. Both calibers employ multiplex drive systems and automatic calendar mechanisms typical of Seiko's digital watch platform. The guide covers essential service procedures: current consumption verification, battery clamp removal techniques, and quartz oscillator testing specifications. Intended for qualified service technicians performing maintenance, adjustment, and component-level diagnostics on these models.
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Document Details
- Format
- Pages
- 1
- Size
- 64.3 KB
- Category
- Watchmaking