Lenovo ThinkPad T23 T20, T21, T22, T23 - Hardware Maintenance Manual (April 20 - Page 57
Run IBM BIOS Setup Utility to, and run IBM BIOS Setup - cmos battery
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Symptom-to-FRU index Symptom or error 0232 Extended RAM error-Extended RAM fails at offset nnnn. 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. 02B2 Incorrect drive A type 02F4 EISA CMOS not writable 02F5 DMA test failed 02F6 Software NMI failed 02F7 Fail-safe timer NMI failed FRU or action, in sequence 1. DIMM. 2. System board. Replace the backup battery and run IBM BIOS Setup Utility to reset the time and date. Replace the backup battery and run IBM BIOS Setup Utility to reset the time and date. Reset the password by running IBM BIOS Setup Utility. 1. Replace the backup battery and run IBM BIOS Setup Utility to reset the time and date. 2. System board. 1. Replace the backup battery and run IBM BIOS Setup Utility to reset the time and date. 2. System board. Run IBM BIOS Setup Utility to reset the time and date. 1. Diskette drive. 2. External FDD cable. 3. I/O card. 1. Load Setup Defaults in IBM 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. ThinkPad T20, T21, T22 and T23 series 51