Seiko Cal. 5Y91A Quartz Movement - Technical Data and Parts List
Technical data and parts catalogue for the Seiko caliber 5Y91A quartz movement. This service manual provides detailed specifications for a 15.3mm diameter, 2.9mm height movement with three-hand display and 1-second step motion via stepper motor drive. The documentation includes comprehensive component identification with part numbers—circuit bridge plates, circuit block, train wheel assemblies, rotor and stator assemblies, and all electronic components. Powered by a single SR626SW silver-oxide battery (1.65V, approximately 2 years operating life). The movement features zero jewels construction with no active regulation system and employs a 10-second measuring gate for calibration and diagnostics. Essential reference for technicians performing service, repair, and parts replacement.
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Document Details
- Format
- Pages
- 6
- Size
- 157.7 KB
- Category
- Watchmaking