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Re: CS-80: make a plan for a servicing

2019-03-22 by pepeisnotadog@...

Hi guys,


i have replaced all the "obsolete" components on CS-80 (el-cap, old CMOS, tantalium cap, etc) and install a lot of sockets etc etc. Now, I'm getting into the calibration nightmare! And of course the most difficult part is that of "Complete VCF Alignment". 


The value I can't set are the values ​​indicated in the manual, but I also struggle to reach those indicated in the photo within this group. I have a couple of doubts: is it correct to set the HPF for a voltage of 4Volt at FH terminal (resistor board) and then the LPF for a voltage of 3.3Volt at LH terminal? Because I saw that putting these cursors in half (as indicated in the CS-60 manual, different from CS-80) I can reach much higher values ​​close to those indicated. The other doubt concerns the other parameters to be set on the control panel (i know it is a silly and perhaps useless question but it is better to remove all doubt): Brilliance (at center) and Resonance (at max) are just two right at the preset switch right? But what about the "initial-after brillance" on the top right of the panel? I left them at minimum to avoid fluctuations due to the aftertouch .. is it correct?


Obviously I found some doubts also in the values of the VCA 3 # and VCA 4 # gains, I read that at least I'm not the only one to have had doubts about the indicated values..


This synth is a masterpiece, but how hard (and long) it is to achieve correct calibration! I thought that the replacement part of the components (several hundred) was the most tiring but maybe I was wrong;)


Best


Mark

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