Impulse 12D not powering on

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SteelTears
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Joined: Wed Dec 21, 2022 4:22 pm

Impulse 12D not powering on

Post by SteelTears » Wed Dec 21, 2022 4:56 pm

I scoured the internet but couldn't find any schematics or notes on these Impulse 12D powered PA speakers. Serial # 0ABBE040955

Symptom: unit not showing any sign of being powered on after the power switch is turned on.

Trouble shooting so far: Verified my AC line voltage past the circuit breaker, to the power supply board (just what I've been calling it, the board with the transformer and the filter caps etc). I've got some high dc voltages that I'd expect to see off some of the legs of the caps and test points. What I don't have is my R+ and R- voltages.

I've never worked on a peavey. Does anyone have a schematic? Know what the transformer output voltages are? Know what the different voltage rails are supposed to be or know any helpful test points and voltages? If there is a surface mounted fuse that I'm maybe missing? Any info at all that can help pinpoint that R+ / R- rail and it's components.

Thanks ya'll

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