Panasonic KX-TD500 System Reference Manual page 1377

4.00 Entering Local DIagnosis
Mode
To enter the Local Diagnosis mode, press the F3
key, or enter the "DIG" command and press the
RETURN key at Local Mode Main Menu screen.
Local Mode Main Menu
Screen ($)
F3
D
F4
H
or
Return
I G
or
E L P
14-A-5
Local Diagnosis mode
(DIG>) See page (14-B-1)
Displays HELP screen to enter
individual mode
Return