Lenovo 20JD, User Manual, Page: 104 / 150

Solution : You still can hear some sound even though you have set the Master volume control at minimum.
To turn off the sound completely, go to the Master volume control and select Mute speakers .
• Problem : When I connect headphones to my computer while playing sound, a speaker does not
produce sound.
Solution : When the headphones are attached, the streaming is automatically redirected to it. If you want
to listen to sound from the speakers again, ensure that you set those speakers as the default device. For
more information, see the help information system for Realtek HD Audio Manager.
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.
For tips on how to maintain the fingerprint reader, see “Using the fingerprint reader” on page 56.
Battery problems
• Problem : The battery cannot be fully charged in the standard charge time when the computer is powered
off.
Solution : The battery might be over-discharged. Connect the ac power adapter to the computer and let it
charge. If the battery cannot be fully charged in 24 hours, contact Lenovo to replace the battery.
• Problem : The computer shuts down before the battery status icon shows that the battery is empty.
Solution : Discharge and recharge the battery.
• Problem : The computer operates after the battery status icon shows that the battery is empty.
Solution : Discharge and recharge the battery.
• Problem : The operating time for a fully charged battery is short.
Solution : Discharge and recharge the battery. If your battery operating time is still short, contact Lenovo
to replace the battery.
• Problem : The computer does not operate with a fully charged battery.
Solution : The surge protector in the battery might be active. Turn off the computer for one minute to reset
the protector; then turn on the computer again.
• Problem : The battery cannot get charged.
Solution : You cannot charge the battery when it is too hot. Turn off the computer and wait for a while to
let the battery cool to room temperature. After it cools, recharge the battery. If it still cannot be charged,
have it serviced.
Power adapter problem
Problem : The ac power adapter is connected to the computer and the working electrical outlet, but the
power adapter (power plug) icon is not displayed in the Windows notification area. The ac power indicator
also does not light up.
Solution : Do the following:
1. Ensure that the connection of the ac power adapter is correct.
2. If the connection of the ac power adapter is correct, turn off the computer, and then disconnect the ac
power adapter.
88
User Guide