18
Symptom - 2 No LED display
/
Keys do not work
Check the Digital P.C.B.
connector (XS4)*3
voltage.
Check the FFC cable *4
connecting Digital P.C.B. and
Front panel P.C.B.
Exchange the Front panel P.C.B.
Exchange the Digital P.C.B.
Exchange the FFC cable.
OK
OK
NG
NG
*3
CHECK POINT LOCATION
*4
VOLTAGE DATA (measurement value)
*3
1
3.3V
13
3.1V
2
3.3V
14
3.3V
3
GND
15
5V
4
0V
16
5V
5
0V
17
11.1V
6
0V
18
GND
7
GND
19
0V
8
3.3V
20
GND
9
GND
21
0V
10
3.3V
22
GND
11
1.2V
23
2.6V
12
0.5V
24
3.3V
1
1
24
24