Sony SPP-A972 Service Manual page 38

• IC Block Diagrams
– BASE MAIN Board –
U1002, 1028 MC74HC4053DTR2
16 15 14 13 12
IN
OUT
IN
OUT
C
C
OUT
IN
C
OUT
C
IN
OUT
IN
1 2 3
U1012, 1020, 1021 SN74HC595ADB-E05
16 15 14 13 12 11
VCC
11 10
C
C
OUT
IN
4 5 6 7
10 9
SHIFT REGISTER
LATCH
GND
2 3 4 5 6 7 8
1
PARALLEL DATA
OUTPUT
U1013 U4083B
9
8
– 49 –
8 7 6
BIAS
CIRCUIT
1 2 3
5
+
_
4