This is a manual for Seiko watch 7D48. It introduces the features and operating methods of the watch.
This manual describes the Seiko kinetic watch, which uses an automatic electricity‑generating system driven by wrist movement to power the watch. It covers the watch’s features, power‑save function, time‑keeping accuracy, and the perpetual calendar.
Instructions are provided for first‑time use, operating the screw‑down crown, starting the watch from power‑save mode, setting time and calendar, and charging the kinetic energy storage unit. Technical specifications are listed at the end of the document. This manual is written in Chinese.
| Crystal oscillator frequency | 32,768 Hz |
|---|---|
| Monthly time deviation | ≤ 15 seconds per month |
| Operating temperature range | -10 °C to +60 °C |
| Drive system – stepper motors | 2 (minute hand 5 s interval, seconds hand 1 s interval) |
| Drive system – piezoelectric motor | 1 (for perpetual calendar) |
| Power‑reserve duration (full charge) | ≈ 4 years (time‑keeping function) |
| Seconds hand 2‑second interval duration | ≈ 12 hours |
Gently shake the watch a few times (about 4‑6 shakes at a 1 Hz rhythm) to generate electricity and reactivate the hands.
Do not pull the crown out to the second position while the watch is in power‑save mode, as it will cancel the power‑save function and erase stored time data.
No. Using a regular silver‑oxide battery can cause overheating, explosion, or fire.