Panasonic KX-TD500 System Reference Manual page 1380

2.00 Diagnosis of Display
Description Used to diagnose the display.
Input Format DIG>DSP
Diagnostic Method Follow the subsequent procedures for diagnosis of display.
1) When the following outer frame appears, confirm the distortion
2) The outer frame disappears and nothing appears for
3) The outer frame appears in reverse video.
of vertical and horizontal lines.
approximately two seconds.
after two seconds
after two seconds
after two seconds
(Continued)
14-B-2