Archive of the former Yahoo!Groups mailing list: Yamaha CS80

hi guys, im hoping someone here can help me calibrate my LAST VOICE OF MY CS80! (along with the kind help of steve sloan, i am hoping to have her 100%).

the diagnosis(i dont have a voltage generator, so i have to do this by ear, but otherwise i am following the factory procedure):

-on presets or sounds that involve an envelope, this one voice does a thing that basically sounds to me like the envelope opens, but just doesnt close. example, on the "funky" presets, this voice sticks WAY out(HPF fully open in sustained note mode), as the normal voices EG close, leaving a low filtered note. this "bad note" sounds like one of the string presets, to give you an impression. on sounds that dont rely on a large EG sweep, you dont notice it. but about 1/2 of the presets do, so its VERY noticeable.

-i know its not the IG00152 chip. thought it was, but swapped with a working chip, and i get same results.

-trim pots VR18,15, and 19-when i sweep through VR15 and VR19, ESPECIALLY the "sustain level"(vr15, i believe) i dont seem to get a huge range of difference. i was able to get the ATTACK calibrated properly with VR18, but there is no trim pot for DECAY, which is really what my problem is. this voice has an infinite decay, basically.

-i measured all 3 of the VCF EG trim pots on a DVM, and they all have a resistance range of roughly 0 to 25k-50k, depending on pot. so they may not be FULLY functioning, but they are definitely not dead.


im totally stumped here. any guesses? thanks alot guys!

-rj





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