Yamaha CS-60 Service Manual page 39

CS60(S/# 1001-
)
IV.
PWM
CIRCUIT
1.
Add
5
±0.1V
to
VC1
(11) terminal
with
PWM
"SPEED"
lever.
Then
adjust
the period
by
VR7
and peak
level
by VR8,
so that the
output from
P
(45) terminal has the
waveform shown below
when
'TWM"
lever
is
fully
raised
and
10 ±
0.1V
is
added
to
D
(43)
terminal.
150+10mS
3
+0.2Vpp
VR
8
)
2.
Adjust
VR12, when
PWM
"SPEED"
lever
is
fully raised,
so that the output from
P
(45)
becomes
5
+
0.5
mS.
NOISE
GENERATOR
CIRCUIT
Adjust
VR10, when "NOISE"
lever
is
fully raised [10
± 0.1V
is
given to
C
(40) terminal]
,
so that
the 3
Vpp
Noise
wave
is
output from
NO
(48) terminal.
OSCILLATOR
CIRCUIT
FOR MODULATION
Add
5
±
0.1V
to
VC2
(16) terminal
by moving
"SPEED"
lever
of
SUB-OSC. Then
adjust the
period
of
oscillation
waveform of
SO
(18) terminal
with
VR9
as
follows.
At
the
same
time,
make
sure the
waveform
of each
SIO
(20),
PO
(17)
and
SO
(19)
terminals.
ov
sot
3. 2 Vpp
SIO(20) Po;i7)
S
0(19)
M
[
i
p
VR
7
VR
8
VR
9
VR
31
VR2
[
VR4
[
i
!
VR
5Ji
I
VR10
VR
6fl
VR
1
1
p
VR19
<s>
VRllfl
J1VR15
LP
I
VR18
VR12JJJ
[
VR20
VR13|]l
fl
VR
6
VRUJL
11
J1
VR17
VR21J
I.
PITCH
ADJUSTMENT
VR1~ VR6
(Refer to
"PITCH
ADJUSTMENT"
on page
17
II.
EG-VCF CIRCUIT
1
.
Set the preset
button
to
"PANEL". Add 10V
to terminals
AL,
IL,
DF,
RF
and
8V
to
AF
(62)
terminal.
Depress
a
key and
adjust
attack
time of the
waveform of
TP1
(22) terminal
as
follows.
k-4raS—
KEY-ON OFF
2.
With
the above
mentioned
setting,
when
3V
is
fed into
AF
terminal,
adjust
VR19
to the direction the time
is
lengthened
if
the attack
time
is
longer
than 125
m
seconds
and
vice versa.
Then
carry out
the adjustment stated
in
item
1
again.
3.
Adjust the
VR18, when
key
is
depressed, so that output voltage
of
TP1
(22) terminal
becomes ±
0.01
V.
37