Hi, the only difference in the voice cards between the CS-50, 60 and 80 are a few resistors I belive. Calibration procedure is exactly the same. The KAS board will more than likely be under the keyboard assembly. I've never seen a CS50 so I am just assuming. Your intermittent fault, losing the voice, could well be a broken connection - either dry joint or a wire break. Try wiggling the looms again. I have found broken wires that way in my CS80. Also, the scale thing. Last time I tuned my CS80 I also had a scale problem and it was mentioned here that the VCO chips can actually change over time and become out of spec on different footages. The tuning procedure says set the scale on the highest footage range. If this is your problem you'd need to set it on the lower (8ft) range. Then it will be out higher up, which is less noticable. Otherwise you'll need new VCO chip.
Cheers,
TOM
--- In yamahacs80@yahoogroups.com, "dzlvs8" <dzlvs8@...> wrote:
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> Hi, I am new to this group and new to the CS synths. I have a CS-50 that is in dire need of calibration and maybe more. I was following this procedure ( http://personal.inet.fi/private/matador/cs-80_adjustment_procedure.html ) to just try to do the tuning portion of it (steps 8-12) and then one voice just kind of slowly started getting a lower and lower frequency until it just went away. I turned the keyboard off and back on and the voice would come back and fade away again.
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> I dont know if this is a problem that someone knows exactly what it is but I wasnt even tuning the voice card that got the problem. So, the first thing I want to do is calibrate the entire device and then see if there is a bad cap or something? maybe??? The note totally went away for almost a day and then I wiggled some stuff and it came back again and started doing the same frequency lowering thing.
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> Anyway, in case this is just a calibration issue, I would like to fully calibrate the CS-50 BUT THE CS80 CALIBRATION INSTRUCTIONS SEEMS TO REFER TO BOARDS THAT I DONT HAVE. DOES ANYONE HAVE CS-50 SPECIFIC CALIBRATION INSTRUCTIONS?????
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> My other issue is that one of my other voice cards will not tune correctly. The difference in the notes as you go to different octaves changes at an incorrect scale as you switch down to lower keyboards settings using the "one octave lower" and "two octave lower" tab. I have done all that I can with the trimmer pots on step 8-12 to try to fix this but the range of the trimmer pots dont go where I need them to to fix the problem. The problem seems to probably be in the voltage supplied to the board??? or the octave ladder network (but I only have the problem with one voice). AND I cant find the KAS board that the CS-80 calibration instruction refer to in a CS-50.
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> Can anyone help me or point me in the right direction?
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