Lenovo ThinkPad X300 6477 Supplementary Manual page 20

Message
021x: Keyboard error Make sure that there are no objects placed on the keyboard, or
0230: Shadow RAM
error
0231: System RAM
error
0232: Extended RAM
error
0250: System battery
error
0251: System CMOS
checksum bad
0271: Date and time
error
12
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ThinkPad X300 Service and Troubleshooting Guide
Solution
if you have one, the external keyboard. Turn off the computer,
and turn off all attached devices. Turn on the computer first;
then turn on the attached devices.
If you still see the same error code, do the following:
If an external keyboard is connected, do the following:
v Turn off the computer and disconnect the external keyboard;
then turn on the computer. Make sure that the built-in
keyboard operates correctly. If it does, have the external
keyboard serviced.
v Make sure that the external keyboard is connected to the
correct connector.
Test the computer by using PC-Doctor.
v If the computer stops during the test, have the computer
serviced.
The shadow RAM failed. Test your computer's memory with
PC-Doctor. If you added a memory module just before turning
the computer on, reinstall it. Then test the memory with
PC-Doctor.
The system RAM failed. Test your computer's memory with
PC-Doctor. If you added a memory module just before turning
the computer on, reinstall it. Then test the memory with
PC-Doctor.
The extended RAM failed. Test your computer's memory with
PC-Doctor. If you have increased memory just before turning
the computer on, reinstall it. Then test the memory with
PC-Doctor.
The backup battery, which is used to preserve the
configuration information, such as the date and time, while the
computer is turned off, is depleted. Replace the battery and
run the BIOS Setup Utility to verify the configuration. If you
still have a problem, have the computer serviced.
The system CMOS might have been corrupted by an
application program. The computer uses the default settings.
Run the BIOS Setup Utility to reconfigure the settings. If you
still see the same error code, have the computer serviced.
Neither the date nor the time is set in the computer. Set the
date and time, using the BIOS Setup Utility.