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This is a genuine Ronda coil block, an original Swiss-made component designed for Ronda calibers 762, 763, 751, and 753 quartz movements. As the electronic “brain” of the movement, the coil block generates the electromagnetic impulses that drive the stepper motor, controlling the stepping of the seconds hand and ensuring precise timekeeping .
This brand new original part is essential for watchmakers restoring proper function when the original coil becomes damaged or fails.
Genuine Ronda Part – Swiss factory-original, not a copy, ensures perfect fit.
Stepper Motor Core – Converts electrical pulses into magnetic force to drive the rotor and gear train.
Multi-Caliber Compatibility – Fits Ronda 751, 753, 762, 763 quartz movements.
Essential for Service – Coil failure is a common cause of non-running, jumping seconds, or inaccurate timekeeping.
Brand New Original – Unused factory stock, guaranteed stable performance.
| Parameter | Details |
|---|---|
| Compatible Movements | Ronda 751, 753, 762, 763 quartz |
| Type | Genuine original |
| Function | Stepper motor coil, controls seconds hand stepping |
| Origin | Switzerland |
| Condition | Brand new, genuine |
Ronda 751 / 753 (typically three‑hand date quartz)
Ronda 762 / 763 (two‑hand or two‑hand date quartz)
Repair of non‑running movements, abnormal second‑hand stepping, or inaccurate timekeeping
Ideal for watchmakers replacing damaged original coils
1. Is this a genuine Ronda coil?
Yes. It is a Swiss Ronda factory-original part for 751/753/762/763 calibers, not a copy.
2. How can I tell if the coil needs replacement?
Symptoms: the movement does not run with a fresh battery. Measure coil resistance with a multimeter – normal range is several hundred to two thousand ohms. Infinite reading (open) or significant deviation indicates a bad coil.
3. What should I pay attention to during installation?
Disconnect the battery first. Align the coil with the locating pins, ensuring good contact with the circuit board. Use non-magnetic tweezers and avoid static. The rotor should spin freely after installation. Professional help is recommended.
4. Is this coil compatible with all 751/762 sub‑variants?
Ronda 751 series (e.g., 751.111, 751.222) and 762 series typically share the same coil module. 753 and 763 are also compatible. Compare the appearance with your original if unsure.
5. Does replacing the coil require re‑calibration?
No. Timekeeping accuracy is determined by the quartz crystal on the circuit board. Replacing the coil does not affect frequency; just confirm the second hand moves smoothly.
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