Yamaha CS80

scott, thanks for the reply. i have a new theory about this, its still just a guess, so if anyone knows for sure, id love to hear from them:

i think the 50k trim pot for VCF EG sustain(r15?) may be shot. if it were, and it was essentially passing signal at "max", then wouldnt that mean that the sustain level of the VCF EG was essentially set to max constantly, causing the EG to SOUND like its never resetting, although it really is just set at a max level?

i've got some extra 50k trimmer pots, i may drop one in on r15/r18/r19 , or whichever one it is.

one things for sure-calibrating the envelopes without a scope is HARD. i broke down last week and ordered one, as ive just had too many instances where i needed one. on all my other synths, i was basically able to tune/calibrate OSC settings by ear, but this one's  a b***ch! (also got a nice hakke desoldering gun. new toys come soon!)


Scott Metzger <scottmetzger3d@...> wrote:                               I have the same thing with my CS80.  It goes away when I turn the IL 
 and AL down all the way on the filter. The envelope never seems to 
 reset otherwise on that voice for the VCF.  Do you have a kenton midi 
 kit installed?  I do.  I wonder if it has something to do with that, 
 or if this is normal.
 
 --- In yamahacs80@yahoogroups.com, rj krohn <r_j_d_2.phila@...> wrote:
 >
 > 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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