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I had a Brusa NLG511 come in for repair.

Symptoms: Would not charge, power LED just blinked.

A quick bench test showed it had a short on the +15V supply...

I could not located which part was shorted, so I hooked up the external supply and set it to +15V...

And slowly turned up the current limit until the magic smoke came out:

NLG511_smoke.jpg

This voltage regulator was the problem:

BlownRegualtor.jpg

Swapped it out with a new LM2941, and the NLG511 is back up and running. :)

Repair Pics:
http://www.wolftronix.com/NLG511_150/index.htm

Videos:
https://www.youtube.com/playlist?list=PLQdu_G7xyFITzuEnnSApIIZUOsm1oYNSv

This is the second NLG51X that I have fixed with a shorted +15V supply.
So it might be a common failure mode.

Thanks,
Wolf
 
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