Originally posted by Station Specialties:
These older power supplies are unique.
Take your but set and connect one side to ground.
Then go across the power supply terminals to listen for the ac.
Now you have found the your ac crkt.
Sorry this is a lost art.
My VOM can distinguish AC from DC; plus I have the schematic... no need to go searching.
Everything is as the documentation says it should be, with the exception that it says you can use AB for talk, and I get hum on it. The intercom card filters it out though, so the issue is resolved.
Thanks -
Matt
