Multimeter reads continuity between +12v and -12v on PSU connector; is that rational? \ VOGONS

Multimeter reads continuity between +12v and -12v on PSU connector; is that rational?

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First post, by keenerb

Posted on 2021-03-15, 23:51

keenerb Offline

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That doesn't seem right to me. I don't have another AT power supply handy to check.

The system in question suffered a serious short between +12v and -12v on the motherboard that burned a hole through it, so I'm questioning whether the PSU itself is damaged...

Reply 1 of 1, by Horun

Posted on 2021-03-16, 03:24

Horun Offline

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The -12v is always from a separate circuit so should be in the 100k+ ohm range from the main +12v ( get 430K Ohm on one of my old working AT supplies).
Could it be that what ever shorted took out the PSU too.

Hate posting a reply and then have to edit it because it made no sense 😁 First computer was an IBM 3270 workstation with CGA monitor. Stuff: https://archive.org/details/@horun

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