IBM ThinkPad Z61 Supplementary Manual page 20

Solving computer problems
Message
021x: Keyboard error
0230: Shadow RAM error The shadow RAM failed. Test your computer's memory with PC-Doctor. If
0231: System RAM error
0232: Extended RAM
error
0250: System battery
error
0251: System CMOS
checksum bad
0260: System timer error
0270: Real time clock
error
0271: Date and time
error
0280: Previous boot
incomplete
12
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ThinkPad Z61 Series Service and Troubleshooting Guide
Solution
Make sure that there are no objects placed on the keyboard, or 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.
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 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 BIOS Setup Utility to
reconfigure the settings. If you still see the same error code, have the
computer serviced.
Have the computer serviced.
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.
Your computer was previously unable to complete the boot process.
Turn the computer off; then turn it on to start the BIOS Setup Utility. Verify
the configuration and then restart the computer either by choosing the Exit
Saving Changes option under the Restart item or by pressing F10. If you
still see the same error code, have the computer serviced.