Re: CS80 Vanishing voices mystery
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one thing to check also on cs-80 ! if you slide the modules chassis up and down a lot ,,, check at the black wires junction that there is no broken or corroded wires or on the verge of breaking? ?. On mine moving up and down the rack a lot , the main? GND 2? black got broken? ( +8.5V/-6.5V ) .. so the supply lost ground reference ,,? the synth was working but the positive and negative rails were moving ( floating )? in parallel up and down moving the keyboard controls levers . That was a bitch to debug ,, it is not evident to see a broken wire at that location ,, there are so many grouped there .
for your problem : you have output on pin 8 of IC5/CP5? , but cannot control VCA/IC6? when triggered . Have you checked if you receive the trigger signal at TR(63) ( broken/corroded/cold solder ) . if yes? check your EG signal? scope/meter TP2 if yes them funky final vca IC6?
You seem to be in control of that bug , you are not far from a solution , nice work DUDE !? check for cold solder joint with freeze mist (were talking about heat related bug )?
remember that the trigger is for both voices so if the other voice is working it is not the trigger circuit .? check for trigger signal first , could be a corroded or broken wire ( white as i remember ????) so many colors .?
hoping IG00159 is good ,, there is plenty of VCA out there but way less IG159?
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On Thursday, August 16, 2018, 8:50:04 p.m. EDT, pyjamagroove@... [yamahacs80] wrote:
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Well, one of my voices just died as described. Took it out, checked but it started to work again so impossible to trace the cause. Now when i have installed the voice card back it died again lol... No output on 0 terminal (out) Now its really dead. I have traced the problem to the IC2 (the EG amp). It has no output. When i turn the VR17 more (initial level) the voice is sounding so I think the card is mostly ok...the problem is envelope / trigger related (TRG boards??). I will investigate more tomorrow.
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