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The ETA 976.001-4000 Circuit Block Electronic Module is a genuine Swiss-made precision component designed specifically for the ETA Caliber 976.001 quartz movement. As the core electronic control unit of the movement, this module integrates the quartz oscillator and integrated circuit to generate precise stepping motor pulses, controlling the accurate operation of the hour and minute hands.
Manufactured to original specifications, this replacement module is the ideal choice for repairing or replacing a faulty original circuit board, restoring timekeeping function without the need to replace the entire movement.
Genuine ETA Part – Produced by ETA Switzerland, not a copy or generic component, reliable quality.
Integrated Quartz Oscillator – 32,768 Hz frequency, providing a high-precision time base.
Low Power Consumption – Designed for long battery life; with 321 battery, theoretical battery life up to 74 months (approx. 6 years).
Two-Hand Function – Drives hour and minute hands, ideal for minimalist two‑hand watch designs.
Direct Replacement – Perfectly fits the ETA 976.001 movement with identical interface and mounting holes; no modification needed.
| Parameter | Details |
|---|---|
| Part Name | Circuit Block / Electronic Module |
| Part Number | ETA 976.001-4000 |
| Compatible Movement | ETA Caliber 976.001 (6 ¾‴ × 5 ½‴, approx. 13.00×15.15 mm) |
| Movement Height | 1.95 mm |
| Jewels | 6 |
| Frequency | 32,768 Hz |
| Battery Type | 321 (SR616SW) |
| Battery Life | Theoretical 74 months (approx. 6 years) |
| Function | Generates stepping motor pulses, controls hour and minute hand timekeeping |
| Origin | Switzerland |
| Condition | Brand new, genuine (some may be new old stock) |
1. Is this a genuine ETA circuit board?
Yes. It is clearly a genuine ETA part, number 976.001-4000, for the ETA 976.001 movement, not a third‑party copy.
2. Which specific movements is this circuit block compatible with?
It is specifically designed for the ETA Caliber 976.001 quartz movement (two‑hand version). The movement measures 13.00×15.15 mm, is 1.95 mm thick, and has 6 jewels. This module also fits other brand movements based on the same platform, such as Longines Caliber 153.2 / 153.4.
3. How can I tell if the circuit block needs replacement?
Symptoms include: the movement does not run with a fresh battery; no pulse output detected on a timing machine; grossly inaccurate timekeeping; or visible corrosion from moisture damage.
4. What should I pay attention to during installation?
Disconnect the battery first to avoid short circuits. Align the circuit block with the alignment pins and contact pads on the mainplate, ensuring good contact between the metal springs and the coil leads. Also inspect the coil for continuity. Use non‑magnetic tweezers and anti‑static precautions. Professional installation is recommended.
5. Does the new circuit need calibration after installation?
The timekeeping accuracy of the ETA 976.001 is determined by the quartz crystal. New factory circuits are pre‑calibrated to standard accuracy. No user calibration is needed, but it is good practice to check pulse frequency with a timing machine.
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