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Midrange Squeal I have become the owner of a Soundtech PC-1250 Powered Mixing Board, and I am interested in making something more than a boat anchor of it. When I obtained the unit I was told the building it was in had suffered a lightning strike, and it hadn't worked since. I took it home to find out what I could and I am stumped as to how to proceed. When it powers up, it emits a constant midrange squeal that is very loud out of all four outputs: R, L, Mon. A, Mon. B. If it were silent I know a thing or two to try. I don't own a scope. Can someone please help me to isolate the origin of this signal so I can proceed? Have been advised That because all four channels emit the same noise, my problem is likely in the power supply. Have examined the PS board/components. No visible indications of problem I can detect. Large capacitors hold a charge and diodes conduct one direction. Haven't found any cracks or loose joints. I showed this unit to a friend. He agrees it's probably a pwr supply issue, but gave me reason to skeptical of a lightning strike being the cause. Schematic at:

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