Lenovo THINKPAD T500 Hardware Maintenance Manual page 49

Table 1. Numeric error codes (continued)
Symptom or error
0250
System battery error—System battery is
dead.
0251
System CMOS checksum bad— Default
configuration used.
0252
Password checksum bad—The password is
cleared.
0260
System timer error.
0270
Real-time clock error.
0271
Date and time error—Neither the date nor
the time is set in the computer.
0280
Previous boot incomplete— Default
configuration used.
02F0
CPU ID:xx Failed.
02F4
EISA CMOS not writable.
02F5
DMA test failed.
02F6
Software NMI failed
02F7
Fail-safe timer NMI failed
1802
Unauthorized network card is plugged
in—Turn off and remove the miniPCI
network card.
1803
Unauthorized daughter card is plugged
in—Turn off and remove the daughter card.
FRU or action, in sequence
1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
Reset the password by running BIOS Setup
Utility.
1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
3. System board.
1. Charge the backup battery for more
than 8 hours by connecting the ac
adapter.
2. Replace the backup battery and run BIOS
Setup Utility to reset the time and date.
3. System board.
Run BIOS Setup Utility to reset the time
and date.
1. Load "Setup Default" in BIOS Setup
Utility.
2. DIMM.
3. System board.
1. CPU.
2. System board.
1. Load Setup Defaults in BIOS Setup
Utility.
2. Replace the backup battery.
3. System board.
1. DIMM.
2. System board.
1. DIMM.
2. System board.
1. DIMM.
2. System board.
1. Remove Mini PCI network card.
2. System board.
1. Remove the daughter card that you
installed.
2. System board.
Related service information
41