Yamaha CS-50 Servicing Manual page 72

3. PRESET TONE SETTING VOLTAGE DIVIDER CIRCUIT {RESISTOR MATRIX)
This circuit sets the control voltage for creating the tone color indicated on the tone selector. The circuit consists
of resistors to divide
+
1 OV supplied from the tone selector so as to provide the control voltage for determining the
tone color at the output terminals (a to v).
The diodes are to prevent the mutual interference of control voltage.
0
~
Preset tone
setting voltage
divider (1) ·
(Resistor matrix)
(T71 circuit
board)
F
A
Controls for VCO, VCF, VCA circuits
b
Preset tone setting voltage divider (2)
(Resistor matrix)
(T72 circuit board)
B
c
D
E
u
v
F
STRING! STRING2 - ELECTRIC CLAVI- HARPS!- GUITARl GUJTAR2 FUNKY! FUNKY2 FUNKY3
PIANO CHORD CHORD
PN2 Tone selector
--<
+JOV
PANEL
T71 circuit board and T72 circuit board constitute the resistor voltage dividers corresponding to respective tone
selectors. performing similar functions. Accordingly, all the output terminals
(a~
v) are connected in common to
supply the voltage for controlling VCO, VCF and VCA circuits. The tone selector switch has priority for the
right-hand-side. When all the tone selector switches are off, STRING 1 is automatically set.
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