Cleaning And Maintenance; Using Headphones Or Earphones - Lenovo ThinkCentre A57e Safety And Warranty Manual

Cleaning and maintenance

Keep your computer and workspace clean. Shut down the computer and then
disconnect the power cord before cleaning the computer. Do not spray any
liquid detergent directly on the computer or use any detergent containing
flammable material to clean the computer. Spray the detergent on a soft cloth
and then wipe the computer surfaces.

Using headphones or earphones

If your computer has both a headphone connector and an audio-out connector,
always use the headphone connector for headphones (also called a headset) or
earphones.
CAUTION:
Excessive sound pressure from earphones and headphones can cause hearing
loss. Adjustment of the volume control as well as the equalizer to other
settings than the center position may increase the earphones and
headphones output voltage and therefore the sound pressure level.
Excessive use of headphones or earphones for a long period of time at high
volume can be dangerous if the output of the headphone or earphone
connectors do not comply with specifications of EN 50332-2. The headphone
output connector of your computer complies with EN 50332-2 Sub clause 7.
This specification limits the computer's maximum wide band true RMS output
voltage to 150 mV. To help protect against hearing loss, ensure that the
headphones or earphones you use also comply with EN 50332-2 (Clause 7
Limits) for a wide band characteristic voltage of 75 mV. Using headphones that
do not comply with EN 50332-2 can be dangerous due to excessive sound
pressure levels.
The use of factors influencing the earphones and headphones output other
than those specified by Lenovo (e.g. operating system, equalizer software,
firmware, and driver) may increase the earphones and headphones output
voltage and therefore the sound pressure level.
If your Lenovo computer came with headphones or earphones in the package,
as a set, the combination of the headphones or earphones and the computer
already complies with the specifications of EN 50332-1. The use of earphones
and headphones other than those specified by Lenovo may lead to heightened
sound pressure level. If different headphones or earphones are used, ensure
that they comply with EN 50332-1 (Clause 6.5 Limitation Values). Using
headphones that do not comply with EN 50332-1 can be dangerous due to
excessive sound pressure levels.
25
Chapter 1. Important safety information