Fingerprint Reader Problems; Battery And Power - Lenovo ThinkPad L420 User Manual

Fingerprint reader problems

• Problem: The surface of the reader is dirty, stained, or wet.
Solution: Gently clean the surface of the reader with a dry, soft, lint-free cloth.
• Problem: The reader often fails to enroll or authenticate your fingerprint.
Solution: If the surface of the reader is dirty, stained, or wet, gently clean the surface of the reader
with a dry, soft, lint-free cloth.
If your finger has any of the following conditions, you may not be able to register or authenticate it:
– Your finger is wrinkled.
– Your finger is rough, dry, or injured.
– Your finger is very dry.
– Your finger is stained with dirt, mud, or oil.
– The surface of your finger is very different from when you enrolled your fingerprint.
– Your finger is wet.
– A finger is used that has not been enrolled.
To improve the situation, try the following:
– Clean or wipe your hands to remove any excess dirt or moisture from the fingers.
– Enroll and use a different finger for authentication.
– If your hands are too dry, apply lotion to them.

Battery and power

This section tells what to do if you have a battery and power problem.
Battery problems
• Problem: The battery pack cannot be fully charged by the power-off method in the standard charge
time for your computer.
Solution: The battery pack might be over-discharged. Do the following:
1. Turn off the computer.
2. Make sure that the over-discharged battery pack is in the computer.
3. Connect the ac power adapter to the computer and let it charge.
If the optional Quick Charger is available, use it to charge the over-discharged battery pack.
If the battery pack cannot be fully charged in 24 hours, use a new battery pack.
• Problem: Your computer shuts down before the battery status indicator shows empty.
OR
Your computer operates after the battery status indicator shows empty.
Solution: Discharge and recharge the battery pack.
• Problem: The operating time for a fully charged battery pack is short.
Solution: Discharge and recharge the battery pack. If your battery's operating time is still short, use a
new battery pack.
• Problem: The computer does not operate with a fully charged battery pack.
Solution: The surge protector in the battery pack might be active. Turn off the computer for one minute to
reset the protector, then turn on the computer again.
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User Guide