Panasonic KX-TD500 Installation Manual page 250

Fan alarm
Error Code 1107 : Basic shelf fan alarm
1108 : Expansion shelf 1 fan alarm
1109 : Expansion shelf 2 fan alarm
1.
Possible cause of
the malfunction
Countermeasures
Yes
Yes
Yes
Yes
Note None
Troubleshooting
The fan of Basic shelf, Expansion shelf 1 or Expansion shelf 2 is out of order.
Is the fan operating?
Is Back Board CN25 3pin "0V"?
Is Q4 collector "5V"?
Is Q5 collector "0V"?
Check the CPU board. (Confirm
that 1, 2, 3, PIN of IC 8 is "0V".)
No
Replace the fan.
No
Replace the fan or "Q4."
No
Replace the "Q4."
No
Replace the "Q5."
5.2 Troubleshooting Guide
251