Panasonic KX-TD500 Installation Manual page 278

5.2 Troubleshooting Guide
(9) Basic shelf AC power down
Error Code
Possible cause of
the malfunction
Countermeasures
Note
278
1200 : Basic shelf AC power down
1.
AC power cord is unplugged.
2.
Power Failure
3.
Malfunction of the Power Supply Unit of the Basic Shelf or Power
Supply System (Backboard, CPU card) failure of the Shelf
Did the above item 1) or 2) occur
at the recorded time of the Error
Log?
No
Does the trouble occur frequently?
Yes
Replace the Power Supply Unit.
No change in
condition
No change in
condition
*It is desirable to store the system programming data on a floppy disk
to facilitate accurate and rapid recovery, considering the limited
running time (about 3 years) of the backup battery in case the Power
Failure continues for a long time.
Replace the CPU card.*
Replace the Shelf.
End
Yes
No
OK
OK
Troubleshooting