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haratua

Jammed Wheel Train?

Question

I just received supposedly a simple battery-change job from a friend. But when I checked the old battery it is actually still good. Since the watch has no seconds hand, I put the watch on a pulse tester, it pulses with 20-20-40 seconds intervals.

1. Is this normal? I have only known a constant pulse interval before this.

Despite having a pulse, the watch hands do not move. I then put it on a Horotec Turbo to check the wheel train. And the hands are jammed, they don't move one bit even on a Horotec Turbo.

2. What should I check / do next?

The movement is SEMAG 656 Swiss AV 4 jewels.

Looking forward to your inputs.

Thanks

Ferdinand

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It is possible some debris has entered the wheels. Also - it is possible that a small piece of metal has attached to the stepping rotor (magnet) and the only solution will be to dismantle the train wheels and check everything under magnification Ferdinand.

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