Anyone have the schematics for the P3001?
Got one here with distorted audio, no audio is making it to either 36P15 MOSFETs. 28N15 has a signal but it appears a bit clipped.
Preamp stage is working fine as im getting clean audio passing through all of the op-amps
ideas?
Got one here with distorted audio, no audio is making it to either 36P15 MOSFETs. 28N15 has a signal but it appears a bit clipped.
Preamp stage is working fine as im getting clean audio passing through all of the op-amps
ideas?
It's a mess but maybe better than nothing.
Confirm that you're getting the proper switching of the differential pair from the LM339, at Q1.
Confirm that you're getting the proper switching of the differential pair from the LM339, at Q1.
Thanks for that! I have full rail voltages, and I have both rails for the op-amps...
Trying to find Q1 in a haystack.
Trying to find Q1 in a haystack.
Collector of Q114 is sitting at rail, with no signal on it. Base has a signal but its pretty much a square wave.
Q105 is shorted to about 3 ohms between collector to emitter... Thats an issue.
Wonder what caused that. So strange
Wonder what caused that. So strange
That's part of the protection circuit. They commonly fail when the outputs fail and the 0.1 ohm source resistors go out of tolerance.
Gotcha. Perhaps its just the resistors, as the outputs have never been replaced/failed in this amp that I can tell.
Possibly there could have been a short across the output at a high output level. Or... just a random failure.
Tell the owner to check all wiring before he reinstalls it.
Tell the owner to check all wiring before he reinstalls it.