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My Mackie HR824 is broken. The tweeter is emitting steady, medium volume white noise, does not respond to gain control.
I have the service manual (http://bmamps.com/Schematics/Mackie/...ice_Manual.pdf) but no schematic. I'll call Loud tomorrow, but if anyone has it, would be appreciated.
I measured the voltages, shown on attached image. Everything is a bit off, but especially the +15v, where I measure +37.3v!
There is a PNP transistor nearby, part Q3. I tried to test it in-circuit. I read no connection between collector and emitter (which is g, and 0.5v drop from B-E and B-C.
Suggestions for where to go from here?
I have the service manual (http://bmamps.com/Schematics/Mackie/...ice_Manual.pdf) but no schematic. I'll call Loud tomorrow, but if anyone has it, would be appreciated.
I measured the voltages, shown on attached image. Everything is a bit off, but especially the +15v, where I measure +37.3v!
There is a PNP transistor nearby, part Q3. I tried to test it in-circuit. I read no connection between collector and emitter (which is g, and 0.5v drop from B-E and B-C.
Suggestions for where to go from here?
Attached Files