Panasonic KX-T336 System Reference Manual page 1579

C.Troubleshooting
1. If the following troubles should occur during
backup operation, stop the operation and
return to the initial screen.
• When the communication cable connection
has disconnected.
• When the backup device has lost power.
In above case stop the loading and boot the
system with default values compulsorily.
Error Message List
Error Message
Device error (VT220)
DATA ERROR 027(Dumb)
Version* error (VT220)
DATA ERROR 029(Dumb)
Checksum error (VT220)
DATA ERROR 030(Dumb)
Illegal code detected (VT220)
DATA ERROR 031(Dumb)
* Version=System Data Version
The system firmware (ROM) needs to be changed only in case of a software update
involving an alteration in the data format of the system area. The backup function does
not allow compatibility between different system data versions. Data saved using the old
version of the firmware can be used as is even if the firmware is updated, as long as the
system programming data (RAM) is not changed.
Contents
Backup device is not connected
(only when maintenance device
is attendant console)
Different version* at the time of
backup
A checksum error has been
detected.
Incorrect data has been
received.
16-C-1
2. Checksum error detection
If checksum error is detected during loading
the system programming data, an error
message appears on the screen and loading
is terminated.
Then the system is reset and started with
default values automatically.
Countermeasures
Connect the backup device to SIO # 1 Port.
Match the backup version.
Communication line is defective or backup
data is destroyed.
Communication line is defective or backup
data is destroyed.