Front Board - Sony HCD-GRX20 Service Manual

IC252 74HC165
IC301 M62439SP
REC OUT2
20
1
REC OUT1
— FRONT BOARD —
IC602 BU2092
18 17 16 15 14 13 12 11
12 BIT
CONTROL
SHIFT
CIRCUIT
REGISTER
12 BIT
STORAGE
REGISTER
1 2 3 4
34
PARALLEL INPUTS
CLOCK
VCC INHIBIT D C
16 15 14 13
CLOCK D C
INHIBIT
SHIFT/
LOAD
CK
E F
1 2 3 4
SHIFT/ CLOCK E F
LOAD
PARALLEL INPUTS
INA2 INB2 INC2 IND2
19 18 17
2 3 4
INA1 INB1 INC1 IND1
10
OUTPUT
BUFFER
(OPEN DRAIN)
5 6 7 8 9
SERIAL OUTPUT
B A INPUT QH
12 11 10 9
B A SERIAL
IN
QH
G H QH
5 6 7 8
G H OUTPUT GND
QH
TONEH2 TONEL2 OUT2
16 15 14 13
5 6 7 8
TONEH1 TONEL1 OUT1
Vss CONT
12 11
CONTROL
LOGIC
9 10
GND VDD