JVC RX-7520VBK, Service Manual

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RX-7520VBK
1-22
CTL 1
L
H
L/H
CTL 2
L
L
H
Output
VIN 1
VIN 2
VIN 3
Control input - output signal
GND
8
Vout
7
V+
6
Vin3
5
1
Vin1
2
CTL1
3
Vin2
4
CTL2
6dB
AMP.
BIAS
NJM2246D (IC501, 551, 552) : Video switch
1. Pin layout / Block diaglam
A
L
H
Y
H
L
1
1A
2
1Y
3
2A
4
2Y
5
3A
6
3Y
7
14 13 12 11 10
9 8
GND
VCC 6A 6Y 5A 5Y 4A 4Y
TC74HCU04AF (IC621) : Inverter
1. Pin layout
2. Truth value
1
2
3
4
5
6
7
8
16
15
14
13
12
11
10
9
1Y
0Y
IZ
Z-COM
0Z
INH
V
EE
GND
Vcc
Y-COM
X-COM
1X
0X
A
B
C
TC74HC4053AF (IC581) : Multiplecer
INHIBIT
L
L
L
L
L
L
L
L
H
C
L
L
L
L
H
H
H
H
X
B
L
L
H
H
L
L
H
H
X
A
K
H
K
H
K
H
K
H
X
Contorol inputs
X: Don't Care.