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This is a genuine circuit block electronic module for the MIYOTA/CITIZEN 0S10 and 0S20 quartz movements, designed for compact three‑hand (hour, minute, seconds) or two‑hand with date calibers. The module integrates a quartz oscillator and CMOS integrated circuit, generating a precise 32,768 Hz time base frequency to drive the stepper motor for accurate hour, minute, and seconds hand movement. As an original OEM replacement part, it provides a direct solution for repairing movement failures caused by water ingress, battery leakage, or aging electronic components.
Genuine MIYOTA Part – Japanese factory-original for 0S10/0S20, not a copy, ensuring perfect fit.
High-Precision Time Base – Integrated 32,768 Hz quartz oscillator with ±20 sec/month accuracy, providing a stable and reliable time reference.
Compact Size – Fits 5½‴×6¾‴ (approx. 13.0×15.2 mm) small movements, common in ladies‘ or ultra‑thin watches.
Low‑Power CMOS Circuit – With an SR626SW (377) battery, typical battery life is 2‑3 years.
Cost‑Effective Repair – Replaces only the faulty circuit board instead of the entire movement, offering significant cost savings.
| Parameter | Details |
|---|---|
| Part Name | Circuit Block / Electronic Module |
| Compatible Movements | MIYOTA/CITIZEN 0S10, 0S20 quartz |
| Movement Size | 5½‴×6¾‴ (approx. 13.0 × 15.2 mm) |
| Movement Thickness | Approx. 2.2 mm |
| Frequency | 32,768 Hz |
| Battery Type | SR626SW (377) |
| Battery Life | Approx. 2‑3 years |
| Accuracy | ±20 seconds per month |
| Functions | Hour, minute, seconds (or hour, minute, date depending on version) |
| Origin | Japan |
| Condition | Brand new, genuine |
MIYOTA/CITIZEN 0S10, 0S20 quartz movements (common in small ladies‘ watches, fashion watches, and small‑size quartz watches from brands like Casio, Seiko).
Repair of non‑running movements, inaccurate timekeeping, abnormal seconds hand stepping, or no response after battery replacement.
Particularly suitable for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.
Professional watch workshops, DIY enthusiasts.
1. Is this a genuine MIYOTA circuit board?
Yes. It is a Japanese factory-original part for 0S10 and 0S20 movements, not a third-party copy.
2. Are the circuit boards for 0S10 and 0S20 interchangeable?
Yes. The 0S10 and 0S20 share the same movement platform; the circuit boards are identical and fully interchangeable.
3. How can I tell if the circuit board needs replacement?
Symptoms: the movement does not run with a fresh battery; no pulse output detected on a timing machine; abnormal seconds hand stepping (e.g., jumping two seconds or stopping); visible corrosion on the PCB due to moisture or battery leakage.
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