I've got a CS-800X that's used for a "stereo" in a shop for many years. Doesn't see a lot of high output use, just running ambient music. Yesterday it started buzzing loudly so it was switched off. I turned it in today to debug and it initially buzzed loudly alternating left and right channels so I turned it back off. When I powered it back up again now it's just flickering green on the power light, again alternating between channels. The relays are clicking intermittently. DDT lights are off, speakers are fine (running on another amp now), fuses are fine and have never been replaced (by us), no other indication of issues.
I took the lid off and immediately noticed R103 on the power board (20W 400ohm) is coooookkkked, it's heated the adjacent areas around the board but looking at the schematic it looks like it's related to the fan but not much else?
Measuring ~75V on both capacitors
Going to start towards verifying +26V and +/-15V output. Any other suggestions on where to start/what to suspect? Seems like it should be on the power board given that it's effecting both channels but that could turn out to be a bad assumption
Model CS-800 X
Serial Number 0A-04444143
90A