Seiko Cal. V785A Service Guide
Seiko Cal. V785A service manual covering complete technical specifications and repair procedures for this 17.8mm quartz movement. The guide details the three-hand display mechanism, step motor with load-compensated driving pulse technology, and the date calendar with instant-set capability. The hand installation height discrimination table distinguishes standard and extra-long hand types—essential for correct reassembly. Circuit block structure diagram (Part No. 4000-813) provides coil resistance specifications (2.4kΩ–2.8kΩ) and current consumption data for electrical diagnostics. Battery compatibility covers SEIKO SR621SW, SEAGEL SR821SW, SONY SR621SW, MATSUSHITA SR821SW, and EVEREADY 364 cells. Movement rated at less than 20 seconds monthly deviation under normal temperature conditions. Features electronic circuit reset switch and battery life indicator function. Ideal reference for technicians servicing or troubleshooting Cal. V785A equipped watches.
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Document Details
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- Pages
- 1
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- Category
- Watchmaking