Yamaha CS80

I think the filter envelope chip is IC12 on the 'M' board.

I also had strange results recently when trying to perform the
calbrations as per the CS80 manual. I wasn't getting the waveform
shown in Step#1 (on TP1) when you're supposed to be adjusting VR's 15&19.

Although in the end mine sounded OK to my ears (eventually) but you
just end up feeling as though there might be something amiss. And the
explanation in the 'How To Adjust' column isn't very clear either.

Anyone any ideas on these calibrations...?

Cheers,
TOM


--- In yamahacs80@yahoogroups.com, rj krohn <r_j_d_2.phila@...> wrote:
>
> hi folks, got an issue im wondering if you could point me in the
right direction of....
> 
> the VCF envelope of one voice on my cs-80 wont open/close properly.
im 100% sure its not a HPF/LPF issue, as they both sweep through the
ranges properly. its just that the attack/decay settings dont cause it
to open/close. i tried to calibrate this, but using the service manual
instructions, i couldnt get the attack ttime to change at all via the
trim pots.
> 
> i believe there is a filter EG chip on the voice cards, right?
possibly a bad chip? 
> 
> im looking forward to getting her to 100% shape. i honestly think
the last time i enjoyed an instrument this much was learning "stairway
to heaven" on gtr when i was 12 yrs old. i walk away from this thing
in awe every time i sit down to play it....
> 
> 
> thanks guys!