Seiko Quartz Cal.78A Parts List
Complete parts list for the Seiko Quartz caliber 78A movement, a compact 5-jewel quartz mechanism measuring 23.3 mm in diameter with a maximum height of 2.9 mm. This service manual includes detailed exploded views of the movement assembly, individual component photographs for precise identification, and full part numbers for every mechanical and electrical element. The Cal. 78A uses a 32,768 Hz quartz crystal oscillator paired with a 2-pole step motor system and features a trimmer capacitor regulation circuit for frequency adjustment. An essential workshop reference for anyone servicing or rebuilding these movements, whether for repair, restoration, or parts sourcing.
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Document Details
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- Pages
- 3
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- Category
- Watchmaking