Yamaha CS-50 Servicing Manual page 69

Ml Circuit M2 Circuit M3 Circuit
board board board
Q, Q, Q, Q, Q, Q,
1' 1' 1'
t
t
t
RES11
Lever
RESL
Lever
RESONANCE
Lever
4. VCA CONTROL VOLTAGE MIXING CIRCUIT
(Reference) When all the output terminals are
loaded with 1 kS1 and all the input
terminals are applied with lOV, the
output voltage at terminals.
QH 1
~
QH 4
is 90 mV.
In this circuit, various control voltages to be applied to
LC
terminal of
VCA
are mixed. The signal level is
controlled by the mixed voltage.
Ml
circuit
board
LC
t
t
SUB-OSC
VCA lever
M2
circuit
board
LC
t
t
PNl
VCA
M3
circuit
board
LC
t
1
M4
circuit
board
LC
1
Touch response
level lever
LEVEL lever
(Reference) When all the output terminals are
loaded with lkS1 and all the input
terminals (L
1
~
L
3 )
are applied with
+lOV, the output voltage at terminals
LC
1
~
LC
4
is
0.18V.
60------------------------------------------------------------------------