For Your Reference:
Disc handling and maintenance
Handling precautions
Hold the disc by the edges so the surface will not be soiled with fingerprints. A
Fingerprints, dirt and scratches can cause skipping and distortion. 
Do not write on the label side with a ballpoint pen or other writ-
ing utensils.
Do not use record cleaning sprays, benzine, thinner, static elec- tricity prevention liquids or any other solvent.
Be careful not to drop or bend the disc.
Do not install more than 1 disc on the disc tray.
Do not try to close the disc tray when the disc is not installed properly. B
Be sure to store the disc in its exclusive case when not in use.
If the surface is soiled C
Wipe gently with a soft, damp (water only) cloth.
When wiping discs, always move the cloth from the center hole toward the outer edge.
(If you wipe the discs using a circular motion, circular scratches are likely to occur, which will cause noise.)
If the disc is brought from a cold to a warm environment, moisture may form on the disc.
Wipe this moisture off with a soft, dry,
Improper disc storage
You can damage discs if you store them in the following places:
Areas exposed to direct sunlight
Humid or dusty areas
Areas directly exposed to a heat outlet or heating appliance
Maintenance
Be sure to turn the unit off and disconnect the AC power cord before maintaining the unit.
Wipe this unit with a dry soft cloth.
If the surfaces are extremely dirty, wipe clean with a cloth, which has been dipped in a weak
Never use alcohol, benzine, thinner, cleaning fluid or other chemicals. Do not use compressed air to remove dust.
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