A
Q
P
O
N
M
L
K
J
Q
P
O
N
M
L
K
J
H
G
F
E
D
C
B
A
H
G
F
E
D
C
B
12
11
10
9
8
7
6
5
4
3
2
1
12
11
10
9
8
7
6
5
4
3
2
1
SUB 3/3
KEC-92346
to MIX 1/2-CN107
PUNCH I/O
PHONES
DATA
CURSOR
KEC-92346
DISPLAY CONTOROLER
SUB 1/3
to SUB 2/2-CN706
Display
to MD MECHA
-CN102
to MD MECHA
-CN101
to MD MECHA
-CN103
to SUB 2/3
-CN707
ROM 16M
SRAM 256K
KM416C1200
SRM2B256SLMX70
MX23C4096
EP ROM 4M
D-FF
EP ROM 2K
D-FF
EXOR
System Reset
CPU
GATE ARRAY
INVERTER
MAIN
2P
2P
6.8K
INVERTER
NC ( TEST )
NC ( TEST )
INVERTER
INVERTER
MULTIPLEXER
Photo Coupler
to MIX 1/2-CN108
OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
OP AMP
DAC & ADC
DAC & ADC
MULTIPLEXER
MULTIPLEXER
MULTIPLEZER
ATRAC
KEC-92347
74p
REGULATOR
BUS TRANSCEIVER
to SUB 3/3-CN705
to MIX 1/2-CN105
3
: Ceramic Capacitor
+ -
1
1
MD4S OVERALL CIRCUIT DIAGRAM 1/2 ( MAIN,SUB1/3,SUB3/3 )
See parts list for details of circuit board
component parts.
Note :
1
1
MD4S
MD4S
MD4S
w
w
w
.
x
i a
o
y
u
1
6
3
.
c
o
m
Q
Q
3
7
6
3
1
5
1
5
0
9
9
2
8
9
4
2
9
8
T
E
L
1
3
9
4
2
2
9
6
5
1
3
9
9
2
8
9
4
2
9
8
0
5
1
5
1
3
6
7
3
Q
Q
TEL 13942296513 QQ 376315150 892498299
TEL 13942296513 QQ 376315150 892498299
