Yamaha CS-30 Service Manual page 33

CS-30(S/# 1001—)
3. RING MODULATOR Circuit
a. Set the VC01/LF0 switch (PSW9) to LFO, the RMO volume (PVR6) to MOD and the KBD/SEQ
switch in the VC02 section to SEQ. Then turn the PITCH 1 of the SEQ section all the way to the left
(so that OV appears at the HP2 (X—11) terminal) and set the LFO section SPEED to F. Adjust
(VR9) so that the TP5 signal is minimum when a 100Hz, 3Vp-p waveform is added to the
f\J
(©—2) terminal.
b. After the above adjustments are made, return the KBD/SEQ switch of the VCO section to KBD and
set the VC02 FEET to 4'. With the G* key ON (i.e., with a IKHz, 3V waveform added to the HP2
(CD—
11) terminal), the waveform shown below should appear at TP5.
If the waveform is unbalanced, take its average.
Note: If the waveform is hard to read, adjust the LFO SPEED slightly.
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