Miyota 9015 no/low power reserve?

[JL123]

Help please!

Miyota 9015 movement watch that didn't use in a month, and it almost totally lost it's power reserve, lasting from 5s to few mintutes only. Manual wind 50 turns and it moves for a while longer (5mins).

Opened the case back and nothing seems to be stuck on the balance wheel and the front hands also isn't blocked. Any ideas? Much appreciated!

 

[ado213]

Magnetised?

 

[JL123]

Thanks for the suggestion! Got a simple demagnetiser off eBay and that did the trick!

 

[d4m.test]

Fascinating, well done

 

[Sunsurfer]

I have a similar problem.

If I give the watch a fast shake to the left and the right it starts working but stopps after 15sec. With this procedure cheap Asian dhgate movements run up to 2 minutes.

If I gently move the watch to left and right it does not start moving alltough the rotor moves in both directions (caseback open).

If I give it a handwind it runs as it should, so somehow the autowinder does not work correct. Any ideas?

 

[chenakos]

I have a similar problem.

If I give the watch a fast shake to the left and the right it starts working but stopps after 15sec. With this procedure cheap Asian dhgate movements run up to 2 minutes.

If I gently move the watch to left and right it does not start moving alltough the rotor moves in both directions (caseback open).

If I give it a handwind it runs as it should, so somehow the autowinder does not work correct. Any ideas?

Reading to your comment, I remembered I have a similar issue with one of my reps.
Did you find the reason behind this?

Anyone else know why this is happening in some watches?