This has reminded me of the one time (a couple of years ago) I tried calibrating the 'M' boards as per the service manual, and finding that everything went well - until I got to this exact part!... VCF - the VR15, VR19 and VR18 section. (Infact VR18, in my manual, is marked on the circuit diagram as 'VR8', just to confuse matters!!)
Anyway, there was no way I was geting anything like the waveforms shown in the 'specifications' column on the chart for this part - "Attack Time" and "Sustain Level"
Maybe I was wrong expecting to see that envelope drawn there on my oscilloscope? Confused me though!
Either way - reading those charts, specifically in the 'How To Adjust' column... it isn't really well written and not too clear as to what you are required to do or are looking for. I was wondering if anyone here 'in the know' could maybe re-write those instructions for us?
Good Luck with your adjustments Max - let us know how you get on.
Cheers,
TOM
--- In yamahacs80@yahoogroups.com, "Max Fazio" <faxiomas@...> wrote:
>
> Many thanks, Laurie and Tom, I forwarded the hint about VR18 (isn't it, Laurie? I mean that should be the threshold); let's keep fingers crossed...
> ;)
> M
> ----- Original Message -----
> From: Laurie Curry
> To: yamahacs80@yahoogroups.com
> Sent: Thursday, December 02, 2010 2:11 AM
> Subject: Re: [yamahacs80] VCF-EG problem on CS-60
>
>
>
> hey max... check the pots on the back edge of the m card.... the top two are hpf the next 2 are lpf ... and the next 3 are envelope for vcf, i believe 1 is attack time 1 is decay and the other is threshold/ level amount... if that threshold amount is too high, it bypasses the trigger of the vcf envelope....... the pots below that pertain to vca env and etc....
>
> -----Original Message-----
> From: Max Fazio <faxiomas@...>
> To: yamahacs80@yahoogroups.com
> Date: 12/01/2010 16:14
> Subject: [yamahacs80] VCF-EG problem on CS-60
>
> Hi people
> I'd need some help to solve a problem: a friend of mine has recently acquired a CS-60 in fair good conditions and we're involved with the tuning and calibration process: suddendly we realized that the VCF-EG in voice #7 doesn't work, it seems like the VCF envelope doesn't get the trigger , while the VCA-EG works good.
> What controls should we do before surrender and look for a working iG00152?
> Thnaks for any suggestion!
> Max
>
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