Panasonic WJ-FS28 Service Manual page 35

1.38.
IC53, IC105, IC845 and IC849 on the Main Board are
using the 2-ch Multiplexer/Demultiplexer IC
YWTC4W53FUL.
Description of this IC is as follows:
Out 1
INHI 2
(TOP VIEW)
V 3
EE
Vss 4
1.39.
IC403, IC502, IC805, IC809, IC814 and IC818 on the
Main Board are using the Dual Operational Amplifiers
IC YWNJM4565M.
Description of this IC is as follows:
OUT A 1
– +
IN– A 2
IN+ A 3
GND 4
(TOP VIEW)
1.40.
IC807, IC816, IC821, IC824 IC827 and IC847 on the
Main Board are using the Triple Inverters IC
YWTC7W04FUL.
Description of this IC is as follows:
1A 1
2Y 2
3A 3
GND 4
(TOP VIEW)
Truth Table
INPUTS (A) OUTPUTS (Y)
L
H
Truth Table
8 V
DD
INPUTS
7 In 0
INHI A
L L
6 In 1
L H
∗
H
∗
5 A
: Don't Care.
8 Vcc
A
7 OUT B
B
+ –
6 IN– B
5 IN+ B
8 Vcc
7 1Y
6 2A
5 3Y
H
L
2. Power Board
2.1.
IC1 on the Power Board are using the Switching
Regulator Controller IC YWFA5304P.
Description of this IC is as follows:
OUT
IN 0
IN 1
None
GND 4
IN– 1
FB 2
2. Front Board
2.1.
IC1 on the Front Board are using the Quad 3-State 2
to 1 Data Selectors IC YWMC74HC257F.
Description of this IC is as follows:
SELECT 1
Truth Table
∗
Z : High Impedance
32
IN– 1
FB 2
(TOP VIEW)
IS 3
CS CT
8
0.45V
+
–
BIAS
+
7V
–
+
3.6V
–
2V
+
–
+
–
–
–
R
Q
S
–
0.24V
+
3
IS
1A 2
1B 3
1Y 4
(TOP VIEW)
2A 5
2B 6
2Y 7
GND 8
INPUTS
SELECT OUT CONT
∗
H
L
L
H
L
: Don't care.
8 CS
7 CT
6 Vcc
5 OUT
7
10µA
6
Vcc
OSC
UVLO
5
OUT
4
GND
16 Vcc
15 OUT CONT
14 4A
13 4B
12 4Y
11 3A
10 3B
9 3Y
OUTPUT
Y
Z
A
B