ETA F04.11A – Technical Communication Summary

The ETA F04.11A is a Swiss-made quartz movement developed by ETA SA Manufacture Horlogère Suisse. Built on the 7¾´´´ platform, it is engineered for high reliability, compact size, and precise timekeeping. As with other ETA movements, it is intended for professional use and must be handled under strict guidelines.

Core Specifications

• Caliber: ETA F04.11A

• Size: 7¾´´´ (17.20 mm diameter)

• Height on movement: Approx. 2.50 mm

• Jewels: 3

• Frequency: 32,768 Hz

• Battery options: Typically No. 364 (1.55V silver oxide)

• Date Function: Usually includes date complication (at 3 or 6 o’clock)

Assembly & Structure

This movement shares architectural similarities with the F03.11A and likely includes the following components:

• Main plate

• Train wheel bridge

• Intermediate, third, and second wheels

• Cannon pinion, hour wheel, minute wheel

• Date indicator and driving wheel

• Hand-setting components: setting lever, yoke, sliding pinion, and stem

• Electronic module: rotor, stator, coil, insulator, and battery contact

Each part must be assembled in a specific sequence with correct torque (usually 0.6–0.7 Ncm) and proper lubrication. ETA recommends Moebius lubricants for various friction points, such as 9014, 9034, HP-1300, D5, and 9501 for thick grease needs.

Environmental & Safety Instructions

ETA mandates adherence to both safety and environmental protocols:

• Eye protection is required during all operations on the movement.

• Harmful cleaning and lubricating agents must be collected and disposed of according to legal environmental standards.

• Substances hazardous to water must not be released into the sewage system or soil.

ETA disclaims liability for damage resulting from non-compliance.

Electrical Testing Procedures

The ETA F04.11A includes built-in EOL (End of Life) detection:

• When battery voltage drops below 1.30 V, the seconds hand makes 4-second jumps.

• Current consumption in running mode is typically ≤1.10 µA.

• Consumption in stop mode is ≤0.5 µA.

• Motor testing involves applying external voltage (1.55V) and observing drive impulses (8 or 32 steps/sec depending on input voltage).

All electrical tests must be performed between 20°C and 25°C.

Service and Maintenance

Servicing must be done by certified technicians using proper tools and antistatic measures. Because this is a high-precision electronic device, incorrect assembly, handling, or lubrication may result in malfunction or irreversible damage.

ETA recommends technicians access detailed repair guides and parts interchangeability via the ETA Online Shop (EOS) at www.eta.ch under the Support Center Portal.

Conclusion

The ETA F04.11A represents a refined and efficient quartz caliber that reflects ETA’s standards for micro-mechanical precision. With its small footprint, low energy consumption, and optional date display, it is a dependable solution for modern watchmakers. Compliance with ETA’s guidelines on repair, assembly, and testing ensures optimal performance and durability over time.