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A
B
GX-900
SCHEMATIC DIAGRAM (MD)
1
P87
C-9
10.1
2
0
5
8
0
6
BUFFER
0
2
4
0
3
-9.8
3
4
5
P84
K-7
6
5.0
2.0
0
7
P87
E-8
8
85
C
D
E
7
0
0
0
0
0
0
0
0
0
1
0
0
0
0
0
0
0
0
0
LPF
MUTING
0
0
10.1
4.7
0
5
8
7
0
0
6
0
0
0
-9.8
0
0
0
0
0
0
0
0
0
-9.8
0
2
0
1
0
0
0
3
0
4
-9.8
6.0
12.4
6.6
6.6
0
0
5.0
0
5.0
5.5
~
~
~
~
~
BACKUP
5.5
3.1
3.4
3.8
3.8
0
µ
IC3, 5 :
PC4570G2
IC4 : TC74HCT04AF-T1
Dual OP-Amp
Hex Inverters
1A
1
14
V
DD
OUT
1
1
8
+V
CC
1Y
2
13
6A
–IN
2
7
OUT
2A
3
12
6Y
1
2
+
–
+
–
2Y
4
11
5A
+IN
3
6
–IN
1
2
3A
5
10
5Y
–V
4
5
+IN
CC
2
3Y
6
9
4A
V
7
8
4Y
SS
F
G
0
0
0
4.7
4.8
0
i
0
0
0
4.7
2.3
0
2.1
4.7
4.7
~
4.7
0
0
MD CPU
0
0
0
0
4.7
5.5
0
0
REGULATOR
5.0
10.3
1.2
1.2
0
0
0
H
I
-9.8
5.1
5.1
5.5
P87
B-9
10.9
P89
A-3
Point i (Pin13 of IC2)
V : 2V/div
H : 50 nsec/div
DC range
1 : 1 probe
0V
J
K
L
* All voltage are measured with a 10MΩ/V DC electric volt meter.
* Components having special characteristics are marked Z and
must be replaced with parts having specifications equal to those
originally installed.
* Schematic diagram is subject to change without notice.
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