IBM A21P, A21M, A22P, A22M, A20M, MT 2631 manual Run IBM Bios Setup Utility to

		Symptom-to-FRU index
Symptom or error	FRU or action, in sequence
0270	1.	Replace the backup
Real-time clock error.		battery and run IBM BIOS
		Setup Utility to reset the
		time and date.
	2.	System board.
0271	Run IBM BIOS Setup Utility to
Date and time error — Neither	reset the time and date.
the date nor the time is set in
the computer.
02B2	1.	Diskette drive.
Incorrect drive A type.	2.	External FDD cable.
	3.	I/O card.
02F4	1.	Load Setup Defaults in
EISA CMOS not writable.		IBM BIOS Setup Utility.
	2.	Replace the backup battery.
	3.	System board.
02F5	1.	DIMM.
DIMM test failure.	2.	System board.
02F6	1.	DIMM.
Software NMI failure.	2.	System board.
02F7	1.	DIMM.
Fail-safe timer NMI failure.	2.	System board.

ThinkPad A20m/p, A21m/p and A22m/p 51