watcj stops ... Balance wheel

[chrisb]

Hey Guys

question, I have a watch which stops working, if I wind it or shake nothing happens. When I give a little push to the balance wheel it runs again. Untill it is empty or set time and it stops. Again hit the balance wheel a bit and start running again.

what could that be?

Thanks

 

[Zulu44gmt]

My first guess would be the intermediate wheel has failed- I just had one fail on a A2836. did the same thing. Part # 203 on the ETA oil chart.

 

[ado213]

once you've nudged the balance wheel, does the watch continue to run whilst on your wrist or are you leaving it dial up on the bench?

 

[chrisb]

YEs it keeps running when I have it on the wrist. When I take it off and leave it going until power reserve is gone, and then want to start it, I have to give a little swing to the balance wheel..

 

[ado213]

How slow or fast is the watch running when you have it running?

 

[chrisb]

runs on time , no problems with that,

Have it on the wrist now for 3 days and no problems, and keeps running... Only when I let it die and don't wind it , it wont start normal..

 

[ado213]

Hmm very strange, my initial thoughts are a large beat rate error, over 1m/sec. But I don't suppose you can check this unless you have a timegrapher?.