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— 48 —
IC252
74HC165
IC301
M62439SP
1
2
3
4
5
6
7
8
9
10
16
15
14
13
12
11
CK
E
F
G
H
QH
D
C
B
A
SERIAL
IN
CLOCK
INHIBIT
SHIFT/
LOAD
GND
QH
VCC
OUTPUT
QH
SERIAL
INPUT
A
B
C
D
CLOCK
INHIBIT
SHIFT/
LOAD
CLOCK
E
F
G
H
OUTPUT
QH
PARALLEL INPUTS
PARALLEL INPUTS
— FRONT BOARD —
IC602
BU2092
1 2
3
4
5 6 7 8 9
10
16 15 14 13 12 11
CONTROL
CIRCUIT
12 BIT
SHIFT
REGISTER
12 BIT
STORAGE
REGISTER
OUTPUT
BUFFER
(OPEN DRAIN)
17
18
VDD
OE
Q11
Q10
Q9
Q8
Q7
Q6
Q5
Q4
Q3
Q2
Q1
Q0
LCK
CLOCK
DATA
VSS
20
19
18
17
16
15
14
13
12
11
1
2
3
4
5
6
7
8
9
10
CONTROL
LOGIC
REC OUT SW
INPUT SW
MONAURAL SW
MUTE
VOLUME CONTROL
Low boost
High boost
REC OUT2
INA2
INB2
INC2
IND2
TONEH2
TONEL2
OUT2
Vss
CONT
VDD
GND
OUT1
TONEL1
TONEH1
IND1
INC1
INB1
INA1
REC OUT1