zajin

CN5 is +5VDC (it says so right on the PCB.. ). It's present even when the amp is off. It's most likely used as a control signal to turn the PSU on/off. You can jumpstart the PSU by connecting the +5VDC to CON/PSONOFF (leftmost wire on the 4-pin conenctor). Do so at your own risk! CN2 has +/-62V, center pin is ground.

Color changes with the heat, it's burned off

Remove the resistor and measure it, it's possible still within specs. But should still be replaced with a higher power one. You need to replace all the electrolytics on the board, and remove all the brown glue/goop.

Hi guys! I have recapped a R-115SW amp, and replaced 2 burned resistors, but I still have issues. The amp fires up and works for 1-30 minutes before it shuts down. Needs a power cycle (mains) so get back on. I found ZD4 shorted, and ZD7 is suspect (I measure 65.5V over ZD7, same as the power coming from the PSU). These are the 2 Zeners close to the board edge, next to the power connector. If one of you could measure the voltage over these 2 zeners for me, that would be super helpful! Edit: I also found a burned tiny transistor, in the same chain. Seems to be marked G1 on the component. Maybe Q2 on the board. Any info on this would also be great!