Lenovo 3000 Q100 Desktop - Manual (Page 20)

15
Safety and warranty guide
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.
Excessive sound pressure from earphones and headphones can cause hearing
loss. Adjustment of the equalizer to maximum increases 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 headphones 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.
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. 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.
31046909 Safety and warranty guide V1.0.0(EN)(R).indd 15 2010-9-27 14:21:04