MIYOTA/CITIZEN 6S10/6S20 Circuit Block Electronic Module

Product Description

This is a genuine circuit block electronic module designed for the MIYOTA/CITIZEN 6S10 and 6S20 quartz chronograph movements. 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 to drive the stepper motor. It controls the precise operation of the central hour/minute hands, central chronograph seconds hand, small running seconds, 60‑minute totalizer, 24‑hour subdial, 1/20‑second chronograph hand, and the date display.

As an original OEM replacement, it provides a direct solution for repairing movement failures caused by water ingress, battery leakage, or aging electronic components and is compatible with the 6S10, 6S20, and the related 6S30 movement.

Key Features & Function

• Genuine Miyota Part – Japanese factory-original, not a copy, ensuring perfect compatibility with 6S10/6S20 movements.

• High-Precision Time Base – Integrated 32,768 Hz quartz oscillator provides a stable accuracy of ±20 seconds per month.

• Full Chronograph Functionality – Drives central chronograph seconds hand, 1/20‑second subdial, and minute counter for timing up to 59 minutes 59 seconds.

• Low Power Consumption – Uses a high‑power SR927SW battery, delivering an extended battery life of up to 4 years.

• Cost-Effective Repair – Replaces only the faulty circuit board, eliminating the need to replace the entire movement and significantly reducing repair costs.

Specifications

Applications

• Repair and Replacement：Direct replacement for MIYOTA/CITIZEN 6S10, 6S20, and 6S30 quartz chronograph movements. Ideal for troubleshooting issues such as non‑running movements, faulty chronograph functions, non‑advancing date, or no pulse output after battery replacement.

• Fault Targeting：Well‑suited for failures caused by water ingress, battery leakage corroding the PCB, or aged electronic components.

• Usage Scenarios：Professional watch workshops, brand service centers, DIY watch enthusiasts.

Frequently Asked Questions

1. Is this a genuine MIYOTA circuit board?

Yes. It is a Japanese factory-original part for 6S10, 6S20, and 6S30 movements, not a third-party copy.

2. Are the circuit boards for 6S10 and 6S20 interchangeable?

Yes. 6S10, 6S20, and 6S30 share identical movements and circuit board modules, making them fully interchangeable. Please verify the original PCB shape and contact layout.

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; date or chronograph functions are inoperative (non-mechanical fault); visible corrosion on the PCB due to moisture or battery leakage.

4. Does the new circuit need calibration after installation?

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. If the chronograph second hand does not return to zero after battery replacement, refer to the user manual for zero‑reset adjustment using the crown and buttons.

5. What should I pay attention to during installation?

Disconnect the battery before handling. Align the circuit block with the locating pins and contact pads on the mainplate, ensuring good contact between the metal springs and the coil leads. Use non-magnetic tweezers and anti‑static precautions. After installation, manually check that the stepper motor rotor spins freely without binding. Professional installation is strongly recommended for inexperienced users.

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