Electronics > Repair
ES120 Electronic Screwdriver repair
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TorP:
Hi! I had a problem with my ES121 motor. It was drawing well over half an amp with zero load (connected to a lab psu). I opened it up by bending the metal tabs on the side and inspected the commutator under a microscope. It turns out there was metal filings in the gaps of the commutator. I cleaned the contacts with a glass fiber brush and that solved the problem. I wanted to share this if others have the same problem :)
tibobon:
I had the same issue.
Cleaning the brushes inside the back of the motor solved it for me too.
Thank you very very much TorP !
thedoginthewok:
Thanks for the tip with the commutator!

I have two ES120 and was able to get them to work again.

I used an xacto knife and made a little video with my cheapo microscope.

https://youtu.be/C6kh2OIFTGY
pamphonica:
I cleaned those commutator gaps as suggested, and removed quite a bit of the heavy grease in the gearbox, replacing it with light watch oil.  This cured the "short-run" problem completely.  Just take care when dis-assembling and re-assembling that everything goes back correctly and that there are no bits left over - it is very fiddly!
Thanks for all the hints.
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