Panasonic KX-TD500 Installation Manual page 294

Troubleshooting
(10) Expansion shelf AC power down
Error Code
Possible cause of
the malfunction
Countermeasures
Note
294
1201: Expansion shelf 1 AC power down
1202: Expansion shelf 2 AC power down
1.
Power failure
2.
Power Supply Unit malfunction of the Expansion Shelf n (n=1 or 2),
or trouble with the Power Supply System (Backboard, CPU card) of
the shelf
Did the above item 1) occur at the
recorded time of the Error Log?
No
Is there a new error message in
the Error Log, when the RESET
button is pressed?
Yes
Does the trouble occur frequently?
Replace the Power Supply Unit.
No change in
condition
Replace the CPU card.*
No change in
condition
*It is recommended to have a current copy of the program on disk to
facilitate accurate and rapid recovery.
No
Yes
Replace the Shelf.
End
Yes
No
OK
OK
Installation Manual