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This is a genuine Ronda 585 coil block, a Swiss-made component for the Ronda 585 powertech quartz caliber. It serves as the core drive component of the stepper motor, converting electrical pulses from the circuit board into magnetic force to drive the gear train for precise timekeeping. This product is brand new and original, intended for repairing movements that fail due to open circuits, short circuits, or corrosion damage to the coil.
Brand：Ronda (Swiss)
Compatible Movement：Ronda 585 powertech quartz caliber (8¾ ligne)
Origin：Swiss Made / Swiss Parts
Quality：Genuine original, brand new
Function：Converts electrical pulses to magnetic force for stepper motor
1. Is this coil block an original Ronda genuine part?
Yes. It is an original Ronda factory part from Switzerland, designed for the 585 caliber.
2. Which movements is this coil block compatible with?
It fits the Ronda 585 quartz movement (8¾ ligne, 20.00mm total diameter). The 585 is a 3-hand with date movement, available with date window at 3 o’clock or 6 o’clock. The coil block is universal across variants, though the date driving mechanism may differ.
3. How do I check if the coil is faulty?
Use a multimeter to measure resistance across the two coil contacts. Normal reading is approximately 1.75–1.95 kΩ. An “OL” reading (open circuit) or very low resistance indicates a faulty coil. Other symptoms include: movement not running after battery replacement, irregular seconds hand motion, or noticeable time gain/loss.
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