I dont have a multimeter that will read amps and I dont have a clamp on meter either. so I have no idea what its drawing..... here's a thought though... do the diodes labled sf302 and sf302a need to be isolated from the FEts in the power supply on the heatsink? I seem to remember two rubber type iso...

I tested all the resistors on the power supply side. they all measure within their tollerances. would a fried BJT keep the fan from getting 12v? or do you think the power draw from higher in the amp stage would be robbing power from the fan? The two transistors that are standing up in the last pictu...

I was rummaging through my garage because I was cleaning it out and I cam across an old ZX600TI that fried some ten years ago..... so I pulled it apart to see what might be the problem. I found a burned hole in the bottom of the PCB and the heat transistor was melted so bad that the terminals werent...