Krell 300S repair

I traced back to the 4 timer chips to see why it kept resetting and going full bias on the the right side, and now that I'm measuring it, it's working like a champ! Dang. But now I noticed the left side kicks the output relays on when it gets down to the 2nd LED bias during power on test. It should wait until the test goes completely down(?). I also hear a constant clicking going on near those relays, but they don't really engage until it drops to the 2nd LED. The schematic shows a 22v DC circuit feeding the relays, but nothing else I can see where it can be turned on and off...

Well, there was a switch on the board that said 'Mains/Manual'. Flipped it back and now the power button works fine. Found out after changing 2 caps. The right side is back to staying on full bias during the bias walkdown test on power up. The left side is fine. My friend has already changed all the main electrolytics on the driver boards before I got it. From what I understand, it could be any one of the protection circuits, or leaky power transistors throwing the DC offset out? I have a cheapo meter; I need to borrow a good one the has lower DC scales...

Excellent. Thanks for the help!

This is a tough one because it's a microcontroller, so I'm guessing it's a reset issue. If you know where the voltage regulators are located, test the output voltage (usually 5 or 12 volts, sometimes one each). The reset of the controller (Pin 1) requires a reference of 5 volts. Check that. Then work back on the circuit trace until you see the first electrolytic capacitor connected between Pin 1 and ground. Check the cap. Then do the same for Pin 26 (VDD). This pin should be 12V (maybe 5, don't know without a schematic). Check along the circuit trace to the first electrolytic to ground. If these caps are dried out the controller will have difficulty maintaining a constant voltage.

That's just the tip of the iceberg. Then there are components that act on the controller outputs that may have failed, such as opto-couplers and transistors.