JVC KD-LX300 Service Manual page 30

KD-LX300/KD-LX100
QQ
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HD74HC126FP (IC771) : Changer control
OE1 1
A1 2
Y1 3
OE2 4
A2
5
Y2 6
Vss 7
HD74HC126
M5282FP-XE (IC321) : E. volume
TE
L 13942296513
1. Pin layout
1 10
2 9
3 8
4 7
5 6
3. Pin function
Pin
Symbol
No.
1 Vcc/2
2 Amp+IN
3 Amp-IN
4 Amp OUT
5 GND
6 NC
7 VCA IN
8 Vc
9 VCA OUT
10 Vcc
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1-30
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Vcc
14
OE4
13
A4
12
Y4
11
OE3
10
A3
9
Y3
8
2. Block diagram
1
2
3
Function
Vcc/2 output for microphone amp.
Microphone amp. positive input terminal.
Microphone amp. negative input terminal.
Microphone amp. output terminal.
Ground.
Non connection.
VCA input terminal.
VCA control terminal.
VCA output terminal.
Power supply.
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y
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8
NJM2100M (IC821) : Operation amp
A OUT
1
A
–
A IN– 2
A IN+ 3
VEE 4
Q Q
3 6 7 1 3
10
9
4 5 7 8
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.
2 9 9 4 2 8
8 VCC
7 B OUT
+
B
+ –
6
B IN–
5
B IN+
1 5 0 5 8 2 9 9 4
m
co
9 9
2 8 9 9