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HP 400F Power Supply Troubleshooting Help Needed!

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David D:
Well, I replaced tantalum C24 and my negative side is back up and running. It wasn't dead shorted, but breaking down under power and pulling the negative rail down.

I do have one question regarding the positive and negative rails: My positive side measures +26.27 volts and my negative side measures -25.65 volts when referenced to ground. Is there any cause for concern that there's a .62 volt difference between them?  :-//

David D:
Anyone?

I have some meter deflection on all ranges with no input (shorted) and want to rule out the power supply before I delve into checking other components.

factory:
The manual gives a tolerance of ±1V for both the +26V & -26V supply, your readings are fine, they are never going to be perfect without adjustment pots, which HP deemed not necessary.

David

David D:
Thanks David!

That table isn't in the version of the manual for my unit (s/n 0950A). I looked in an older version (734-) and it's there. Makes you wonder why HP went backwards on their manual  :-//

Thanks again for the help. I appreciate it!

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