WS 6: Repairing a Caliber PUW 910: Partially stripped Movement and Rotor
And I think here is finally the culprit, the rotor! It seems that its magnetization had changed because when dismantling the movement, I could feel that was no unusual friction on the gear train at all. I am still happy that I did not touch the keyless works (winding and setting mechanism) because this was not really necessary to determine the watch's problem. Of course I would have probably disassembled the whole watch to clean it in the ultra-sonic machine, but not without some reluctance.
I am not trying to present myself as some auto-didactic super watchmaker and I tell you frankly, it took me three hours (!!!) to put the rotor and the two wheels back under that bridge. Why? This is why I came to believe something was wrong with the rotor's magnetization. There was almost no way, the rotor would stay in place, it always flipped to the left side. The problem could have also been a wrongly magnetized stator. The stator is that long part with the rectangular whole where the thin yellow line ends.
The circuit will send an impulse to the coil, the coil will change the stator's polarity and that change of the magnetic field will then turn the rotor, the rotor will try to align its South pole with the North pole of the stator and in order to do that, it has to turn. As you can see there are teeth at the lower end of the rotor. If the rotor turns, it will forward its energy to the first wheel. You can see its jewel just left of the rectangular hole. After a second, the circuit will send another impulse, again changing the polarity of the stator, and the rotor will turn again. That is in very simple words the functioning of a quartz watch. What would be the mechanical equivalent? The balance and the lever escapement and instead of a circuit, the main spring would provide the energy.
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