Lenovo ThinkPad L450, User Manual

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Solution : The control is designed to compensate for minor differences in balance and does not
completely mute either channel.
• Problem : There is no volume control for MIDI sound in the Volume Mixer window.
Solution : Use the hardware volume control. This is because the built-in synthesizer software does
not support the control.
• Problem : The sound cannot be turned off even if you set the Master volume control at minimum.
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 you connect a headphones to your computer while playing sound, a speaker does not
produce sound.
Solution : Once the headphone is attached, the streaming is automatically redirected to it. If you want
to listen to sound from the speakers again, be sure to set those speakers as the default device. The
procedure is as follows:
1. Open Control Panel .
2. Click All Control Panel Items .
3. Click the SmartAudio icon. The SmartAudio window opens.
4. Look at the playback devices. If you have attached a headphones, the headphones will be
automatically set as the default device, and the icon for that headphones will be checked.
5. To set a different device as the default, double-click the icon for those speakers. That icon will
now have a check mark.
6. Play any sound by use of a music program such as Windows Media Player. Make sure that sound
comes from the speakers.
For details, refer to the help information system for SmartAudio.
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, refer to Maintaining the fingerprint reader.
Battery and power problems
This topic contains instructions on troubleshooting battery and power problems.
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. Do the following:
1. Turn off the computer.
2. Connect the ac power adapter to the computer and let it charge.
If a quick charger is available, use it to charge the over-discharged battery.
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User Guide