Panasonic MX-3MX-3C TV Service Menu
Service Menu Panasonic MX-3MX-3C
CTV Service ModeSimultaneously press 'RECALL' on remote control and volume on the TV pannel
To select press chanel up or channel down
To change the value data press volume up or down button
To save and exit press 'NORMAL' on the remote control.

Panasonic MX-3MX-3C TV Service Menu
Photo credit : fronthoz.com