Seiko Quartz Cal. 7430A, 7431A, 7439A Technical Guide
Technical service guide for Seiko quartz watch movements Cal. 7430A, 7431A, and 7439A. Includes specifications for time indication variants (2 or 3 hands, with optional date and calendar mechanisms), circuit block structure diagrams, disassembly and reassembly procedures with numbered component illustrations, lubrication specifications, and comprehensive checking and adjustment procedures covering output signal, hand setting, battery voltage and conductivity, coil block resistance, gear train mechanism, setting mechanism, reset and train wheel positioning, accuracy, current consumption, water resistance, and battery life indicator.
Documentation must be downloaded on a computer (PC, Mac, or Linux).
Do not use a smartphone or tablet to download documentation; they generally lack sufficient memory capacity to handle large files, and few users know how to locate the download folder on these devices.
Once downloaded, you can use it right away and even print the pages you need, or use your smartphone in photo mode to translate into the language of your choice: Google Translate
Document Details
- Format
- Pages
- 6
- Size
- 246.2 KB
- Category
- Horlogerie