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BWD Minilab 603B regulator not behaving as expected

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gbaddeley:
You could try taking out the PCB and give a good wash with distilled water and scrub with a tooth brush. Dry in the sun.

mikerj:

--- Quote from: clay1905 on February 08, 2020, 01:45:48 am ---Lifting one end of R323 obtains -26VDC.

--- End quote ---

Just to confirm, lifting one end of R323 causes the output terminal of the LM320T regulator to increase to -26v?  That makes no sense at all, are you sure you were measuring at the correct point?

clay1905:
Thanks, and indeed I will. I'm thinking about going the whole hog, and giving a good scrub with isopropyl alcohol first, followed by a rinse in the purest rainwater, collected by virgins on a full moon in Icelands......
He's at it again.
Thanks again. A good scrub could be just the thing. Just now it's pouring down though. I think it'd be a good thing to wait until some drier, warmer weather.

trobbins:
If you have removed all external loads from the regulators, then I'd first suggest you add temporary loading and also an output cap as typically suggested by the IC manufacturer.  If you can't achieve local regulation then I'd suspect each regulator and do a temporary swap of cutover to confirm you can get nominal operation.  There are also a maximum input/differential limit of just 25V, so any form of output short, or loss of R320 or R321 connection would exceed ratings with a 30VDC input - which may have happened in the past.

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