Vcf/Vca Circuit - Roland SH-1 Service Notes

JUL
20 1978 SH-1
VCF/VCA CIRCUIT
r
VCFH12
HPF
CUTOFF
FREQ
.
^ J
cut6ff;
FREQ"'
t:
i5k
IMDJ
7
EXT SIG
ENV
FOL'R
Ienv-i|
|C617^|
L
R672;
IK
R67!
100K
•VH606
500KD
1R676
100K
VR607
VR608
hoOKB
100KB
VR609
100KA
iResonAn^
VR612I
100K
1VR611
100K8
1R677
15K
VR610
10DKB
OUTPUT
KCV
gate
GATE+TRIG
BENDER
MOD
ENV-1
SIGi
ENV FOL'Ri
I
LFOrUi
LFO TRIG<
I
C618_2&
l/SOT
+ y
R6794
^
4-
100
2
in, in.
R680
12K
AOSR,
>D608 D609
1VR613
100K8
ISUSTAINl
WIOr+H
0611
(Uni^
(McSI
VR615 VR616 VR617
IMA
500KA IMA
IRELEASEI
lAp-ACKl
UD612
J[D613
<n
b o
GATE
I
1
Wtrig
LFO GATeJ
6
P— A—
O
p
«
/ S60A
/
R682
330K
VCFH-1-1
VR618
IMA
VR619
SOOKAl
IRESONAN^
R606
390k
L/W»V
R607
IK
R605
15K
-AWv
—
VR601
I
R605
L-a-X:i
;R604
:
4.7K
R609
100K
>R608
I
1K
R610l
:
39
K^
in.
R612
68K
fWA-
;R611
:15K
R613
1k
widthI
VR604
R642 R6«
39 K 33 K
SDT-10 00
:R616
:39k_^
in,
R618
,
68k
R619
IK
R622
100 K —
C6I2
.053
R620
IK
;R621
:39K_^
in.
R624
,
68K
R625
15K
R625
1K
:R628|
:39k_^
in.
VCA TP
IDC balance]
R633
R630 C605 1M
,330K
.1
If
R629
15k
H631
IK
JR632
I
IK
FR636
P«>37
VCF TP
6.8K 15K
R641
150K
R644
47K
UN—
B60i
M
L'oomI
v._
2SK30A(Y)
2SC1740(Q)
2SA826(Q)
2SK30A(GR)
SERIAL
NO.
UP
TO 700499: SERIAL NO. UP TO 711149:
R641
:
180K
R667: 22K R621; 15K
SERIAL
NO.
UP
TO 710749: R680: 15K
R628: 15K
R658: 33K
R610: 15K R604: 6.8K
R616: 15K
R605: lOK
IVCa
Icutoff:
VR605?]
I
loor^'^
9609
W.
:R647
:330K
:R648
1M
bR655
:iooK
C615
.033*
5
+,
TantH
turn
,C607
I
y/35
R649
33K
B610
I
Q/,17 33K^
R652
9611
R654
150
R666<R667
lQDk$ 18K
R65D 330K
/TA
:330Ki-r^WvV-H
)
|R664i
330k:
IR665
1H
9617
0618
9619
iR670
:t00
w,in,m
R668 C619
27K
.001
2jZ
C608
Tant-5
I
R67I
R658
C616
.033
VCF-VCA
R661
33 K
R659^R660
53K
547K
9616
R662
100k
R663
150
C609 C610
100/16 100/16
j[D604
m
1
AD5R
1S2473
^
^
Mylar
O
Tantalum
Test Point 59BS8806
Thermistor SDT-1000
Electrolytic, Non-polar
i
I
Styrol
CmZ)
l/4V Resistor
Electrolytic
IC601,
IC607:
IC602-IC606
:
pPC1458C
CA3080A
All diodes are 1S2473.
All PNP Tr
's
are 2SA826-Q.
All NPN Tr
's
are 2SC1704-Q.
All FET
's
are 2SK30A-GR unless otherwise specified,
(^Roland
10