Lenovo ThinkPad X220 Tablet Hardware Maintenance Manual page 53

Table 2. Numeric error codes (continued)
Symptom or 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.
02B2
Incorrect drive A type.
02D0
System cache error.
02F0
CPU ID:xx Failed.
02F4
EISA CMOS not writable.
02F5
DMA test failed.
02F6
Software NMI failed
02F7
Fail-safe timer NMI failed
1801
Attached docking station is not supported
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.
1804
Unauthorized WAN card is plugged in - Power off and
remove the WAN card.
1805
Unauthorized Wireless USB card is plugged in - Power off
and remove the Wireless USB card.
FRU or action, in sequence
1. Charge the backup battery for more than 8 hours
by connecting the ac power adapter.
2. Replace the backup battery and run the ThinkPad
Setup program to reset the time and date.
3. System board.
Run the ThinkPad Setup program to reset the time
and date.
1. Load "Setup Default" in the ThinkPad Setup
program.
2. DIMM.
3. System board.
1. Diskette drive.
2. External FDD cable.
3. I/O card.
1. CPU.
2. System board.
1. Load Setup Defaults in the ThinkPad Setup
program.
2. Replace the backup battery.
3. System board.
1. DIMM.
2. System board.
1. DIMM.
2. System board.
1. DIMM.
2. System board.
Shut down the computer and remove it from the
docking station.
1. Remove Mini PCI network card.
2. System board.
1. Remove the daughter card that you installed.
2. System board.
1. Remove the WAN card that you installed.
2. System board.
1. Remove the Wireless USB card that you installed.
2. System board.
Chapter 4
.
Related service information
47