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This is a genuine MIYOTA circuit block electronic module (coil block) for the 5Y30 movement, made in Japan, designed for the 5Y30 3‑hand quartz caliber. It serves as the core control component, integrating a quartz crystal oscillator and a CMOS integrated circuit to generate precise time base signals for the stepper motor . This product is brand new and original, ideal for repairing movements that have failed due to water ingress, battery leakage, or aging electronic components.
Brand：MIYOTA (by CITIZEN)
Compatible Movement：5Y30 3-hand quartz caliber (no date)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Generates and processes time signals, drives stepper motor
1. Is this circuit module an original MIYOTA genuine part?
Yes. It is an original MIYOTA factory part, made in Japan, designed for the 5Y30 3‑hand quartz movement .
2. Which movements is this circuit module compatible with?
It fits the MIYOTA 5Y30 series quartz movement (5½×6¾ ligne, approx. 15.75×13mm, 2.54mm height) . The 5Y30 is a 3‑hand, no‑date movement commonly found in ladies‘ watches and fashion timepieces . This module does not fit 5Y20 (2‑hand) or 5Y32 (3‑hand with date) calibers.
3. What are the symptoms of circuit module failure?
The circuit module is the core control component of the movement. Common symptoms include: movement not running after battery replacement, seconds hand jumping every 4 seconds (EOL indicator) , or noticeable time gain/loss . Use a multimeter to check coil resistance—normal range is approximately 1.8–2.6 kΩ—an abnormal reading confirms replacement is needed .
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