Yamaha CS80

Please could someone confirm for me that the presets on the M board
(eg: VR's 11,12,13 and 14) need to be adjusted so that there is
'0-volts' on the IC pin they feed (Pin1)

Trying to make sense of the tuning adjusting procedure but the setting
of these is not mentioned anywhere in the manual.

Cheerz.
TOM

Hi,

You need to put a scope on the cp4 VR11 and 12and cp5 VR13 test points and 
adjust these pots for audio signal amount.

VR11 Sine wave 1v
VR12 Square wave 800mv
Vr 13 Sine wave 400mv

The front panel should be set up with sine full up and vcf amount full down 
to do VR11 and VR13
and sine down and vcf amount up with square wave on. In both cases LPF and 
VCA sustain Should be full up also.

VR14 can be done by ear. In most cases this is better to do than with a 
scope.



Kent


KSR

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