Panasonic KX-T336 System Reference Manual page 1455

3.03 TSW clock down (Internal/External)
(1) Internal clock down
Error Code
Possible cause of
the malfunction
Countermeasures
Note
0300
1) TSW card connection error
2) TSW card clock link failure (Internal)
After confirming the TSW card
connection, press the RESET
button
Is the trouble registered in the Error
Log ?
Yes
Is an Extension/CO call possible ?
No change in
condition
If the TSW clock malfunction occurs:
1) The attendant console does not function.
(Communication to the LPR becomes impossible)
2) Calling becomes impossible
3) Power Failure Transfer will be activated
14-E-6
(70695)
No
Replace the TSW card
Replace the Shelf
End
Yes
OK