Help! I have a problem with my 400!
I haven't used it in a few weeks. I powered her on today, and the right channel is extremely distorted. It sounded like a blown speaker. Left channel is fine. First I swapped the speaker cable output to rule out the speaker, and the problem moved to the other channel. Okay, not the speaker. I put them back and then swapped inputs L/R and the problem stayed with the right channel. Okay, it's not the source or the RCA cable. I thought it might be a faulty rca jack, so went ahead and I replaced it. Same problem. Finally, I moved the white and black input wires on the control board from left channel to right, and the right is still garbled. It must be in the amp.
Any suggestions on what to look for first? The amp was working fine for over a year with no issues. It hasn't moved or been tampered with. There is still sound out of the channel, but it's 50% distorted. Where to start troubleshooting?