Lenovo ThinkCentre A57e C&L 1 Switzerland - English, French,German,Ita - Page 27
Cleaning, maintenance, Using, headphones, earphones
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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. Chapter 1. Important safety information 23