Seiko Cal. V091A Service Guide
Seiko Cal. V091A service manual covering this distinctive hybrid analog-digital movement. The design combines a traditional 3-hand analog display with a Nematic Liquid Crystal digital readout using FEM (Field Effect Mode) technology, suitable for technicians servicing dual-display watches from the period. Movement dimensions measure 38.8 × 22.6 × 6.2 mm; the stepping motor powers the analog train while multiplex drive manages the digital segment. Power comes from two SR1120W batteries (SEIKO, SONY, or MAXELL branded; alternatively EVEREADY 391 cells) rated for approximately 2 years at 1.55V per cell. Current draw stays below 5.4 µA, and monthly rate accuracy is within 20 seconds. The guide addresses hand-height installation with three distinct options—short, standard, and extra height (reference UV09142)—critical for proper analog-display alignment without jewel complications. Whole-movement replacement policy governs service scope. Essential troubleshooting and repair reference for watch service centers and experienced restorers working with this Seiko caliber.
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Document Details
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- Pages
- 2
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- Category
- Watchmaking