JVC RM-RE9000, Service Manual

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RM-RE9000
1-7
1
2
3
4
5
6
7
8
9
10
1A
1B
1CLR
1Q
2Q
1Cx
2Rx/Cx
Vcc
1Rx/Cx
(TOP VIEW)
TC74VHC123AF-X(IC112) :Shift register for relay control
11
12
13
14
15
16
GND
1Cx
1Q
2Q
2CLR
2B
2A
2. Block diagram
3. Timing diagram
-
+
-
+
D
B
B
t
rr
t
rr
L
H
Vref Vref
C2
F/F
R
R
X
/C
X
RX/CX
C
X
Q
N
Q
P
V
CC
V
CC
Q
CK Q
A
A
CLR
CLR
Q
Q
Q
Q
V
IH
V
OL
V
OH
V
OH
V
refH
V
refL
GND
V
OL
V
IH
V
IH
V
IL
V
IL
V
IL
V
CC
t
w OUT
t
w OUT
t
w OUT+
1. Pin layout