Panasonic WJ-FS28 Service Manual page 33

1.28.
IC823, IC826, IC829 and IC830 on the Main Board
are using the Dual 4 to 1 Data Selectors IC
YWMC74HC153F.
Description of this IC is as follows:
STROBE 1G 1
SELECT B 2
DATA 1C3 3
DATA 1C2 4
(TOP VIEW)
DATA 1C1 5
DATA 1C0 6
OUTPUT 1Y 7
GND 7
Truth Table
INPUTS
OUTPUT
SELECT STROBE
B A G
∗ ∗
H
L L L
L H L
H L L
H H L
∗
: Don't care.
1.29.
IC812 on the Main Board is using the Quad 2-Input
AND Gates IC YWMC74HC08AF.
Description of this IC is as follows:
1A 1
1B 2
1Y 3
2A 4
2B 5
2Y 6
GND 7
(TOP VIEW)
Truth Table
INPUTS OUTPUT
A B
L L
L H
H L
H H
16 Vcc
15 STROBE 2G
14 SELECT A
13 DATA 2C3
12 DATA 2C2
11 DATA 2C1
10 DATA 2C0
9 OUTPUT 2Y
Y
L
C0
C1
C2
C3
14 Vcc
13 4B
12 4A
11 4Y
10 3B
9 3A
8 3Y
Y
L
L
L
H
1.30.
IC106, IC204, IC304 and IC921 on the Main Board
are using the Hex Inverters IC YWMC74HC04AF.
Description of this IC is as follows:
1A 1
1Y 2
2A 3
2Y 4
3A 5
3Y 6
GND 7
Truth Table
INPUT
A
L
H
1.31.
IC406 on the Main Board is using the Quad 2-Input
OR Gates IC MC74HC32AF.
Description of this IC is as follows:
1A 1
1B 2
1Y 3
2A 4
2B 5
2Y 6
GND 7
Truth Table
INPUTS
A B
L L
L H
H L
H H
30
14 Vcc
13 6A
12 6Y
11 5A
10 5Y
9 4A
8 4Y
(TOP VIEW)
OUTPUT
Y
H
L
14 Vcc
13 4B
12 4A
11 4Y
10 3B
9 3A
8 3Y
(TOP VIEW)
OUTPUT
Y
L
H
H
H