16OperationHow to operate the CD/MP3/WMA/AAC playerOperationAbout compact discs• The signal recorded on a compact disc is read by a laser beam, so nothing touches the disc surface.A scratch on the recorded surface or a badly warped disc may cause deteriorated sound quality orintermittent playback. Observe the following precautions to ensure high quality sound performance:About brand new CDs• Do not leave an ejected disc in the disc slot for very long; the disc maywarp. Discs should be stored in their cases and kept away from hightemperature and humidity.• Do not adhere of paper or tape. Do not write on or scratch either sideof a disc.• Discs spin at a high speed inside the main unit. Keep cracked orwarped discs out of the player to avoid damaging the main unit.• Avoid touching the recorded surface when handling a disc; handlediscs by their edges.• You may notice that some brand new discs are rough around thecenter hole or outside edge. Remove the rough edges with the side ofa ballpoint pen, etc. Rough edges may prevent proper loading in themain unit. Flakes from the rough edges may also stick to the recordedsurface and interfere with playback.Rough EdgesBallpoint penRough EdgesFlakesRecorded surface