Hello all, I've picked up a SA-7100 off the bay for chump change. I've always loved the x100 series and would love to add one to my collection. This one is non-working but in beautiful cosmetic shape with hardly any sort of noticeable scratches on the wood case or face. Just wondering if anyone has run into this on this model who could give me a few hints on what to look for. When you power up the unit, immediately the protection light comes on for a few seconds, the relay does not click, then the protection light goes out. I've pulled the power transistors and they all test good doing a diode mode test using the DMM. All fuses are good. I went over the boards with a magnifier and cannot see anything obvious. I haven't done a dim bulb test on it yet, and I admit, I screwed up there and should have done it when I first powered up.
I have a complete SA-7100 power supply assembly and a complete power amp assembly (without the power trannies) on the back shelf I can use, and I can strip what I know is a good protection board and relay from an SX-727 parts machine I have that are the same for the SA-7100. If anyone with a hunch can tell me which one of those boards I should cut out for testing first or if there is a most likely cause elsewhere, I would appreciate the insight. Thanks!
I have a complete SA-7100 power supply assembly and a complete power amp assembly (without the power trannies) on the back shelf I can use, and I can strip what I know is a good protection board and relay from an SX-727 parts machine I have that are the same for the SA-7100. If anyone with a hunch can tell me which one of those boards I should cut out for testing first or if there is a most likely cause elsewhere, I would appreciate the insight. Thanks!