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Do NOT attach paper or tape etc. to a disc. . Do NOT expose the discs to direct sunlight or excessive heat. Clean the discs before inserting them into the disc magazine. Always clean a disc from the center outward with a cleaning cloth. There may be burrs left on the inner and outer edges of a brand-new disc. The burr may cause the malfunction of the unit or sound dropout. To prevent these problems, if the burr is left on the disc, be sure to remove them with a ball-point pen, etc. as illustrate