Panasonic TU-Z100U Service Manual page 13

5.1.2. Monitor mode
Monitor mode use the RF remote control.
5.1.2.1. How to access
1. Select [Monitor] in Service Mode of Tuner box.
2. Press [OK] button on the RF remote control.
5.1.2.2. How to enter into Service Mode of the Display unit
While pressing [VOLUME ( - )] button of the Display unit, press [INFO] button of the RF remote control three times within 2 seconds.
Service mode of the Display unit sees section 5.2.
13