Panasonic CT-Z1422 TV Service Menu

Service Menu Panasonic CT-Z1422

Simultaneously press the Volume down button on the TV and press 9 key at the remote control for one second.
Use channel up or down to select the parameters.
Use volume up or down button to change the value data.
To exit press ACTION button in the remote control.

Panasonic CT-Z1422 TV Service Menu

Photo credit : teletimer.com