Panasonic KX-T336 System Reference Manual page 1409

7) After the diagnosis of the CRT display ends, the following
Note :
Displayed Message
display appears and waits for command entry.
DIG> CRT
CRT Test start
*****
Complete
*****
DIG>
(1) (2) (3)
CRT LED OPR
( ) ( )
C C
R R
Pressing the F8 key or CRTL + C key during the diagnosis stops
the diagnosis and displays "Abort."
Displayed Message
Error: Illegal main command
*****
Error: Illegal sub command
*****
(4) (5)
KEY REP
( ) ( ) ( )
C C C
R R R
There is an error in the main command.
There is an error in the sub command.
13-D-4
(6) (7) (8)
ALL HELP END
( ) ( ) (
C C
R R
Meaning
)
C
R