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Old 11-10-2021, 09:46 AM   #17
Join Date: Feb 2010
City & State: Ames Iowa USA
Line Voltage: 120VAC 60Hz
Posts: 69
Default Re: Motor control board repair

Originally Posted by R_J View Post
When you checked for the missing -15 volts, was that using the main transformer with 120vac applied or was it when you used your 24vdc bench power supply?
That was with the power supply. I finally got a chance to try the board in the machine and the input voltage was 107VAC.. not sure why it's 107V because that is just outside the typical 110-120VAC. Either way, in that case the -15V was also missing, and I was still getting about +1V on that rail, so my first task will be to get that figured out and repaired.
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