Hey folks, I'm having an issue with a Sunn Coliseum 300. Here's the schematic:

http://www.prowessamplifiers.com/schematics/sunn/Coliseum_300_Bass.html

With a guitar plugged in, it gives no sound unless the strings are plucked hard - then it farts and fuzzes a bit. It sounds great through the pre-amp out jack.

I don't yet have a dummy load to use to do all of the test point voltage testing, so I'm trying to see if I can figure it out before jumping to that. I hooked up a signal to C1, assuming that's the power amp in point, and got the same result. However, I'm confused by a connection issue - in the schematic, it looks to me as though R302 in the preamp should connect to C1 in the power amp through the molex connector, but that's not actually what's happening. Instead, R302 is on pin 1 of the molex and connects to the TP6 junction. C1 doesn't appear to be connected to anything, as that spot in the molex header (pin 2) does not have a wire connected to it. Is this correct? Does anyone have a picture of the internals of this amp to compare?

Thank you!