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This is a genuine circuit board assembly (coil block) for the MIYOTA 5Y30 quartz movement, made in Japan. It serves as the “brain” of the movement, integrating a quartz crystal oscillator and an 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 quartz caliber (3-hand, no date)
Origin：Made in Japan
Quality：Genuine original, brand new
Function：Generates and processes time signals for stepper motor
1. Is this coil block 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 coil block compatible with?
It fits the MIYOTA 5Y30 quartz movement (5½×6¾ ligne, approx. 13.00×15.15mm). 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 coil block failure?
The coil block is the core control component of the movement. Common symptoms include: movement not running after battery replacement, noticeable time gain/loss, or intermittent stoppage. Water ingress or battery leakage are common causes of circuit board damage in this movement. Timely replacement is recommended.
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