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This is a genuine circuit block electronic module for the MIYOTA/CITIZEN JS05 quartz chronograph movement. As the movement’s core electronic control unit, the module integrates a quartz oscillator and CMOS integrated circuit, generating a precise 32,768 Hz time base frequency. This is divided to drive the stepper motor, controlling the precise operation of the central hour/minute hands, chronograph seconds hand, small seconds hand, 30-minute counter, 24-hour indicator, and the date window at the 4:30 position. As an original OEM replacement part, it provides a direct solution for repairing JS05 movements that have failed due to water ingress, battery leakage, or aging electronic components.
Genuine MIYOTA Part – Japanese factory-original, not a copy, ensuring perfect fit for the JS05 movement.
High-Precision Time Base – Integrated 32,768 Hz quartz oscillator provides a stable reference for timekeeping.
Full Chronograph Support – Drives central hour/minute hands, chronograph seconds, small seconds, 30-minute counter, 24-hour indicator, and date display.
Low-Power CMOS Circuit – With a 364 (SR621SW) battery, it achieves a typical battery life of approximately 3 years.
Cost-Effective Repair – Replace 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 JS05, JS15, JS25 series quartz chronograph |
| Movement Size | 12½‴ (approx. 28.2 mm) |
| Movement Thickness | 4.30 mm |
| Frequency | 32,768 Hz |
| Battery Type | 364 (SR621SW) |
| Battery Life | Approx. 3 years |
| Accuracy | ±20 sec/month |
| Functions | Central hour/minute, central chronograph seconds, small seconds, 30-minute counter, 24-hour indicator, date (4:30 position) |
| Origin | Japan |
| Condition | Brand new, genuine |
MIYOTA JS05, JS15, JS25 series quartz chronograph movements.
Repair of non‑running movements, faulty chronograph functions, non‑advancing date, or no pulse output after battery replacement.
Particularly suitable for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.
Professional watch workshops, brand service centers.
1. Is this a genuine MIYOTA circuit board?
Yes. It is a Japanese factory-original part for JS05, JS15, and JS25 series movements, not a third-party copy.
2. 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; date does not advance (non-mechanical fault); visible corrosion on the PCB due to moisture or battery leakage.
3. Is this module compatible with JS15 or JS25 movements?
Yes. The JS05, JS15, and JS25 movement families share the same circuit block and are directly interchangeable. However, verify the original PCB shape and contact layout.
4. Does the new circuit need calibration after installation?
English：No. Timekeeping accuracy is determined by the quartz crystal. New factory circuits are pre-calibrated to standard accuracy. A timing machine check is optional but recommended.
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