Troubleshooting Guide - Panasonic SJ-MJ75 Service Manual

4. When entering the main unit's key check mode, "KEY JP" will be displayed.
When "KEY JP" is displayed, press
the HOLD switch to OFF (no order). Then, "KEY OK" will be displayed.
Note:
If "KEY OK" is not displayed, check the following voltage for each key.
To exit the main unit's key check mode, remove the battery.
Note:
Refer to "Printed Circuit Board and Wiring Connection Diagram" for the test
points.

7. Troubleshooting Guide

Key Test point
IC201-35 pin
HOLD TPX110
VOL + TP307
VOL - TP307
TP307
TP307
, ,
ON OFF
0V 2.3V
2.3V
0V 2.3V
0.6V 2.3V
1.2V 2.3V
1.7V 2.3V
35
, VOL (+/-) keys and set
0V