Panasonic KX-T336 System Reference Manual page 1449

2.00 Troubleshooting via the LED Indicators
When the system detects a problem, the alarm LED indicator located on the top shelf will turn red.
(Refer to the figure below)
If the detected trouble is generated by a card, the alarm LED indicator on the card will light up simultane-
ously.
(Refer to the table below)
When the trouble is cleared, the alarm LED indicator located on the top shelf goes off automatically.
LED Indicators on the Top Shelf
Panasonic
Alarm LED on the Top Shelf
ON
RUN OFF LINE ALARM
Location of LED Indicators on the Card
LED on the Card
ON
System Down
(CPU<1>)
RAM
ON
Calendar
(CPU<2>)
Backup Battery
Clock
Progress Tone
ON
Optional Conference TSW
(TSW)
OHCA TSW
DTMF G/R for test
Link
Card Type Error
ON
ROM
(LPR)
RAM
MODEM
Card is not installed
AC/DC Power Supply
None
SMDR Communication
14-E-2
LED indicators on the CPU card
Possible contents
<1>
<2>
Error Code
None
0Axx
0700
0C00
0300
0600
0900
D000
FFFF
10xx
21xx
11xx
12xx
14xx
13xx
0410
0500
0510
0B00