Panasonic KX-TD500 System Reference Manual page 1434

3.13 System memory error (Minor)
Error Code
Possible cause of
the malfunction
Countermeasures
Note
0Axx
xx= 01 : RAM IC 1
08 : RAM IC 8
1) Intermittent defect of RAM IC on the CPU card.
(Including Input/Output bus)
2) Introduced noise.
None
Reset the CPU
Enter the system data
End
15-E-16