Panasonic KX-TD500 Installation Manual page 284

5.2 Troubleshooting Guide
(5) Heat alarm
Error Code
Possible cause of
the malfunction
Countermeasures
Note
284
1104 : Basic shelf heat alarm
1105 : Expansion shelf 1 heat alarm
1106 : Expansion shelf 2 heat alarm
1.
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"?
Yes
Check the CPU board.
(Confirm that 8, 11, 13 PIN of IC40
is "0V.")
None
No
Isn't CN8 on the Power unit dis-
connected?
Troubleshooting