Panasonic KX-TD500 Installation Manual page 249

5.2 Troubleshooting Guide
Heat Alarm
Error Code 1104 : Basic shelf heat alarm.
1105 : Expansion shelf 1 heat alarm
1106 : Expansion shelf 2 heat alarm
1.
Possible cause of
the malfunction
Countermeasures
Yes
Note None
250
The heat of the power supply of Basic shelf, Expansion shelf 1 or Expansion
shelf 2 exceeds the limit.
Is CN17 A8pin on the Back Board
"0V"?
Check the CPU board.
(Confirm that 1, 2, 3, PIN of IC40
is "0V.")
No
Isn't CN8 on the Power unit dis-
connected?
Troubleshooting