Troubleshooting Guide - Panasonic SJ-MJ55GH Service Manual

Main unit's keys
HOLD OFF
VOL+
VOL-
5. After all keys have been pressed and there is no abnormality, "E
OOO " will be displayed.
6. Perform below voltage check about the keys come under if it is
not displayed "E OOO ".
Main unit's keys
HOLD
VOL+
VOL-
Note:
Refer to "12. Printed Circuit Board Diagram" for the test points.
7. Remove the battery when you exit from this mode.

7. Troubleshooting Guide

LCD display position and letters
After the second key is pressed, the first digit displayed
will change from "
After the second key is pressed, the second digit
displayed will change from "
After the second key is pressed, the third digit displayed
will change from "
Check points
IC201 48pin
TP428
TP421
TP421
TP421
TP421
" to "O ".
" to "O ".
" to "O ".
ON
0V
0V
0V
0.58V
1.13V
1.69V
OFF
2.2V
2.2V
2.2V
2.2V
2.2V
2.2V