JVC RX-7020VBK Service Manual page 22

RX-7020VBK
TC74HC4053AF (IC581) : Multiplecer
1Y 1
0Y 2
IZ 3
Z-COM
4
0Z
5
INH 6
V 7
EE
GND 8
NJM2246D (IC501, 551, 552) : Video switch
1. Pin layout / Block diaglam
GND Vout
8 7
6dB
AMP.
1 2
Vin1 CTL1
TC74HCU04AF (IC621) : Inverter
1. Pin layout
1-22
16
Vcc
INHIBIT
15
Y-COM
14
X-COM
13
1X
12
0X
11
A
10
B
9
C
X: Don't Care.
V+ Vin3
6 5
BIAS
3 4
Vin2 CTL2
Contorol inputs
C B A
L L L K
L L L H
L L H K
L L H H
L H L K
L H L H
L H H K
L H H H
H X X X
Control input - output signal
CTL 1 CTL 2 Output
L L
H L
L/H H
2. Truth value
A Y
L H
H L
VIN 1
VIN 2
VIN 3