Panasonic WJ-FS28 Service Manual page 22

Pin Name I/O
123 BST2 I BST2 signal input terminal.
124 BST3 I BST3 signal input terminal.
125 BST4 I BST4 signal input terminal.
126 BST5 I BST5 signal input terminal.
127 BST6 I BST6 signal input terminal.
128 BST7 I BST7 signal input terminal.
129 Vss1 – Ground terminal.
130 V – Power supply terminal.
DD
131 Y0 O Y0 signal output terminal.
132 Y1 O Y1 signal output terminal.
133 Y2 O Y2 signal output terminal.
134 Y3 O Y3 signal output terminal.
135 Y4 O Y4 signal output terminal.
136 Y5 O Y5 signal output terminal.
137 Y6 O Y6 signal output terminal.
138 Y7 O Y7 signal output terminal.
139 Vss1 – Ground terminal.
140 V – Power supply terminal.
DD
141 RY0 O (R–Y)0 signal output terminal.
142 RY1 O (R–Y)1 signal output terminal.
143 RY2 O (R–Y)2 signal output terminal.
144 RY3 O (R–Y)3 signal output terminal.
145 RY4 O (R–Y)4 signal output terminal.
146 RY5 O (R–Y)5 signal output terminal.
147 RY6 O (R–Y)6 signal output terminal.
148 RY7 O (R–Y)7 signal output terminal.
149 Vss1 – Ground terminal.
150 V – Power supply terminal.
DD
151 BY0 O (B–Y)0 signal output terminal.
152 BY1 O (B–Y)1 signal output terminal.
153 BY2 O (B–Y)2 signal output terminal.
154 BY3 O (B–Y)3 signal output terminal.
155 BY4 O (B–Y)4 signal output terminal.
156 BY5 O (B–Y)5 signal output terminal.
157 BY6 O (B–Y)6 signal output terminal.
158 BY7 O (B–Y)7 signal output terminal.
159 Vss1 – Ground terminal.
160 Vss2 – Ground terminal.
Description
1.5.
IC909 on the Main Board is using the Voltage
Detector IC YWM51957BFP.
Description of this IC is as follows:
N.C. 1
Input 2
N.C. 3
GND 4
Input
1.25V
H
Output
L
1.6.
IC103, IC203 and IC303 on the Main Board are using
the Dual Precision Retriggerable Monostable
Multivibrators IC MC74HC4538AF.
Description of this IC is as follows:
1T1 1
1T2 2
1CD 3
1A 4
1B 5
1Q 6
1Q 7
Vss 8
Truth Table
INPUTS
A B RESET
H
L
H
L
∗ ∗
∗
: Don't care.
19
5µA
Typical
-
-
+
1.25V
(TOP VIEW)
t t
d d
≈ 0.34 x Cd (pF) µs
t
d
16 V
15 2T1
14 2T2
13 2CD
(TOP VIEW)
12 2A
11 2B
10 2Q
9 2Q
OUTPUTS
NOTE
Q Q
H Output Pulse
H L H Inhibit
Inhibit
H L H
H Output Pulse
L L H Inhibit
8 N.C.
7 Vcc
6 Output
5 Cd In
t
t
DD