----- Original Message -----From: adhmzaiuszSent: Tuesday, April 03, 2012 5:47 AMSubject: [vintagesynthrepair] Jupiter 6 common no sound problemHi again, so I found a messed up JP6 recently that I bought to try and get it up and running. It turns on with all the LEDs Lfo lights blink etc, but seems to be frozen with no sound. If I wait about 10 minutes it seems to unfreeze so I can push buttons and lights come on but still no sound. I've been reading that this seems to be a common problem, and the suspect is the voltages that drive the digital side of the machine.
I measured the power supply and all voltages are within spec except one that I am a little curious about, the reset out of the power supply seems to be at a constant voltage (i think it was 5v maybe could've been 10v off the top of my head). Being called a reset output makes me think that maybe this voltage isn't supposed to be a held voltage and should maybe be a triggered momentary pulse to reset the cpu or something like that? Can anyone confirm how the reset out is supposed to behave, let me know if i'm on the right track and possibly give a little insight of how to remedy this common problem. Thanks again!
Greg
Message
Re: [vintagesynthrepair] Jupiter 6 common no sound problem
2012-04-03 by jammie
reset should be a momentary pulse usually 5v if it
is constant held high then it will be in constant reset plus being 10v for a cpu
chip is to high a voltage so cpu could be damaged