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A-33
CIRCUIT DIAGRAM
C
CRU BOARD
OUT-I-
OUTB
MIDI
OUT-I-MIDI
OUTB
0
OFF
OFF
O
-1
OFF
ON
-1
0
ON
OFF
-1
ON
ON
L^=L2=L3=L'?=SBTO"IGDW
ICS
]
R-ie
8
y-^\y\y
NC
LR
VCC
EN
7
G
-l<S
NC
BND
5
~l
0
-IS
MUXO
1
BO RWO
MUX1
B
-19
RW1
MUX
2*
3
-18
RWB
KO
-17
RW3
5
1B
BOP
KB
6
-IS
MUX3
K3
7
-I4
VRH
8
-I3
VRL
MOD
9
-IB
DRTR
BEND
-10
-I -I
CN'l
RMPCI
S7''I6P
MKO
-1
-18
TO
BRO
B
-15
T-l
MK-1
3
-14
TB
BR-I
4
-13
T3
MKB
5
-IB
T4
BRB
8
.
-l-I
IS
MK3
7
^
0
-10
TG
BR3
8
9 T7
UT1
YKRE-l-SOB^
JO
IC2B
A<p
74LSOS FLRT
ICBC
IC7R
V
7-^HCDB
FLRT
IC7B
V
74HC08
FLRT
ICBR
I
74LS0B'
FLRT
to
control
pcb
X
RD-I
3
X
RDB
4
X
RD3
S
X
RD4
6
X
RDS
7
X
RDG
8
X
RD7
9
RBI
BXtOKS
to
keyboard pcb
CNB
RMPC'1B7B0P
UT2
THRU
Y<FSt_^054
L1
SBTQ460
74LS05
f^LRT
QB
R'lB
*
4<7S
"
ICBE
74LSQ5
FLRT
B
CS
3
fiS
RXW
5
E
6
TXD
7
RXD
8
IRQ
9
XIRQ
MK4
-1
SO TO
BR4
B
rv
-IS
T-l
MK5
3
O
-18
TB
BR5
4
-IX
T3
MKG
5
-IB
T4
BRG
G
-lb
T5
MK7
7
'14
TG
BR7
8
-13
T7
MK8
9
-IB
MK9
BRB
-10
-I-l
BR9
RR6
BXtOKS
VCC
RR5
f
aX-IOKS
V
G
D
N
D
D
5
4BB
5
943
CBStOuF^S
IC4
68HC11E30FP
74LS05
FLRT
0^
BSCB4'IB
CNB
CQNN_6X1
E
"InF
C-IB
l
ciB^
5%
'luF'16
-luF-lB
To
JRC< Pcb
3
K-l
64
4
KB
63
5
R9
6B
6
BOP
59
7
XRES
58
8
R8
57
9
K3
56
PED
13
MOD
15
DRTR
17
BEND
19
BTCK
14
EXPJ
16
PEG
18
SEL
BO
CS
54
RS
53
RXW
5B
E
51
TXD
50
RXD
47
666
PCO
—
IKU
_
XIRQ
RES
36
RD1
37 RDB
38 RDS
39 RD4
40 RDB
41
RDG
4B
RD7
IB
MUXO
X
11
MUX1 X
10
MUXB
X
9
CSPO
X
8
RWO
X
7 RW1
X
6
RWB
X
5
RW3
X
B8
B9
30
B7
MOOR
25 MODS
BB VRH
.
31
T
\
RDO
3
\
RD1
4
\
RDB
7
\
RD3
8
\
RD4
13
\
RDS
14
\
RDG
17
\
RD7
18
CSPO
11
XRES
—
Ic
IC5
SSC-IOOC
R'15B33^B4
to
keyboard pcb
B
OUT1
5
OUTB
6
MUX3
9
rrr'
-IS
HH
-IS
H R
-16
HH
-19
Hrg-
CLKVCC
CLR
ICG
74HCS73
FLRT
.
.
VCC
^
EXCCL453BU^
EXCCL4G3BU-1
EXCCL453BU-I
R4
VCC
10KS
|C5
7
-ibuF-lG
VRL
IC-1
M51953R
Is.
1
4
MK9
3
BR9
B
MK9
1
BR8
18
T7
X
15
TS.
X
14
T5
X
13
T4
X
11
T3
X
10
TB
X
9
T1
X
8 TO
X
80 MK7
79 BR7
78 MKG
77 BRG
75 MK5
74 BRG
73 M<4
72 BR4
71
MK3
70 BR3
68 MKB
67 BRB
GG
MK1
65
BR1
64 MKO
63 BRO
RRB
8X-IBKS
RR3
8X15<S
VCC
CN4
C0NN_6X1
VCC
RES
NC
BND
CRP
From Power
Supply
Pcb
C-I8
-lOOnF
5X
C-IO
-
TPB
BBpF^
^
npO
8MHz
,10MS
—
C11
~
BBpFS
'
npO
8MHz
-lOMS
-
C4
"
BBpFS
npO
CN5
RMPC1
B7-I6P
CN6
RMPC-I
B71SP
CB3
-lOOuF-IG
IC70
V
74HC08
FLRT
IC7C
V,
74HC08
FLRT
PIN1
KQ
1
o
o
o o
IB
nc
PINB
PIN17
DRTR
1
O O
0 0
16
PEG
PINS
nc
P
15
nc
PIN4
PIN19
BEND
B
15
SEL
PINS
RW3
3
14
RWB
PING
PINB1
VRL
3
14
VRH
PIN7
RW1
4
13
RWO
PINS
PINB3
GND
4
13
GND
PINS
CSPO
5
IB
MUXB
PIN10
PINBS
MODB
b
/V
/>
IB
nc
PIN11
MUX1
R
o o
11
MUXO
PIN1B
PINB7
MODR
6
11
PIN13
PED
7
o 0
10
BTCK
PIN14
PINB9
7
X'
n
10
P1N15
MOD
8
o o
9
EXPJ
PIN16
PIN31
EXTRL
a
9
nc
0
0
CN7
RMPC-I B7-18P
PIN33
XTRL
1
o
o
16
RDO
PIN35
nc
B
15
RD1
PIN37
RD2
3
o o
14
RD3
PIN
39
RD4
4
13
RDS
PIN41
RDG
5
IB
RD7
PIN43
RES
6
O 0
11
nc
PIN45
XIRQ
7
10
IRQ
PIN47
RXD
8
o
0
9
nc
PIN34
PIN49
GND
1
PIN36
PIN51
E
B
PIN38
PIN53
flS
3
PIN40
PIN55
VDD
4
PIN4B
PIN57
RS
5
PIN44
PINS9
BOP
6
PIN46
PING1
nc
7
PIN48
PINGS
KB
8
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