Service: Omega Electronic f300 Geneve – ESA9162

IMG_1531Not only Bulova built tuning fork watches. The Swiss movement manufacturer ESA also made a tuning fork movement under licence from Bulova. Amongst others, Omega used this movement in their Omega Electronic Geneve Chronometers.

Kim sent this one over for a service, so let’s see what lurks inside…IMG_1533

A first look clearly shows the two coils that keep the tuning fork humming.IMG_1536

The bottom plate is fairly standard.IMG_1539

The bridge has the tuning fork attached to it, and the index and pawl fingers, and of course the index wheel that is driven by the index finger. Overall, I prefer the ESA construction over the Bulova one, as it’s easier to work on, and the pawl finger position is easier to adjust.IMG_1542

With the little bridge removed, you can now clearly see the index wheel (the smaller of the two wheels in the centre).IMG_1545

The top plate is an easy enough construction, with the second hand arbor having a spring pressing against a plastic ring to make the movement of the hand smoother and to prevent vibration.IMG_1547

With the little bridge removed, you can see the plastic ring, and the wheel above that contains the clutch so that you can set the time without turning the index wheel.IMG_1551

Now it’s time for the bottom plate.IMG_1555

The electronics are kept away from the cleaning machine.IMG_1556

Reassembly starts with the top plate.IMG_1558

Now the index wheel and bridge are mounted.IMG_1559

Then the coils and circuit go in.IMG_1560

Now the tuning fork bridge is mounted on the top plate, and, after putting the battery in, I can adjust the index and pawl finger position.IMG_1561

Finally, I put the bottom plate back together.

IMG_1588With the dial and hands back on, I case the movement, and the watch is humming happily again.

 

21 thoughts on “Service: Omega Electronic f300 Geneve – ESA9162

  1. Oi . Vejo que este Omega esta com uma Bateria Renata 390 ? O original seria 343 com mercúrio que não se fabrica mais , o substituto seria Renata 344 de óxido de prata . Então a 390 também seria um substituto aceito ?
    Qual e o intervalo de tempo recomendado para revisão para este calibre ? Obrigado
    Ricardo

    • eBay is a good source of parts, or complete donor movements.
      As pointed out by Christian these are better left to a competent watchmaker who has experience and knowledge into these little marvels! Way too many have been damaged by incompetence!

  2. Christian,
    Great post and very informative, I didn’t know you could handle these ESa movements! I have an Omega F300 Seamaster in a ‘cone’ case which has been recently serviced in the UK. However, it has gained time on two separate occssions, once just before it was serviced and the last time just after it was posted back to me. Is there a possibility that the index and pawl finger position is either not being not correctly adjusted so that it will be able to withstand the normal knocks and bumps of daily wearing without it gaining bursts or is the issue that the index mechanism is moving or slipping during transit in the post? Is this type of movement more susceptible to knocks in general?

    Paul

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