Adcom 5400 Power Amp Distortion - Need Help

[partialresponse]

Thanks for the suggestion. I will post there as well. I was just wondering whether this was a common problem with this amplifier.

Kofi

[MCH]

Just a quick note here. Have you checked if the speakers are actually ok? Played them through another setup to make sure there is no problem with them. I had a problem with a speaker that had a bad interenal connection. I thought it was my amp also. But turned out to be the speaker.
my .02 cents

[sam9]

There are a lot of things it could be but since it happens with a low input signal. I would guess that the amplifier circuits are not getting the voltage they should from the power supply. My reasoning is that if something fails in the amp circuit, itself, the result is most frequently a short which causes protection circuits to shut everything down. The fact that it will play at low levels without triping the termal indicaior suggests something amiss in the power supply.

In any case this is not likely to be something you can fix yourself without a schematic and some experience in diagnosing problems inside the enclosure.

[partialresponse]

yes, I have checked to make sure it's not the speakers (they play without problems on another receiver).

Yes, I suspect it's the power supply section. Someone else has suggested rail fuses so I'll check those as well.

I'm fairly comfortable checking the circuit with a schematic. I should have one soon.

Thanks
Kofi

[partialresponse]

Problem found...it turned out to be a couple of blown rail fuses. Thanks for all the responses.

Kofi