NAD C542 Maintenance, Handling Compact Discs, Cleaning Discs, About the Optical Pickup

general, the quality of a CD-R, CD-RW are better when produced at a lower speed against a higher speed on the same recorder or re/writer.

MAINTENANCE

At periodic intervals, open the disc drawer and wipe with a damp cloth to remove any loose dust.

HANDLING COMPACT DISCS

Handle Compact Discs with care. The playback of a disc will not be impaired by small dust particles, a few light fingerprints, or slight scratches. But large scratches, or a thick layer of oily fingerprints, can pre-vent the player from tracking the disc. (Incidentally, although the tracking optical pickup “plays” the disc through its clear side, the actual data surface is embedded directly beneath the label, protected only by a very thin coating of lacquer. So a scratch that cuts through the label may damage the disc more than a similar scratch on the transparent “playing” surface. Thus you should treat both surfaces of the disc with care.) Severe scratches or fingerprints may cause the player to mis-track (skipping ahead, or repeating the same passage). Less severe damage may produce very brief bursts of high-frequency noise. The tracking and error-correction circuits of this NAD CD player are unusually sophisticated, providing secure tracking of flawed discs that are unplayable on some other players. Nevertheless, the discs should not be abused or handled carelessly. For best results, grasp the disc only by its edges.

CLEANING DISCS

Soiled discs may be cleaned by wiping with a soft cloth, either dry or moistened, with water. Do NOT use conventional LP record- cleaning products (cleaning solutions, sprays, treated cloths, or anti-static preparations), nor any kind of chemical solvent

(alcohol, benzene, et al). A severely soiled disc may be washed in a warm-water spray, possibly with a small amount of a mild kitchen detergent added, and then wiped dry with a clean, soft towel.

When cleaning the disc, use only RADIAL strokes (from centre to edge). Never use a circular wiping motion like that used for cleaning ordinary LP records, because in wiping the disc there is a risk of scratching it. A radial scratch will do the least harm because it affects only a small portion of each circular data track, which can be fully compensated by the player’ s error-correction circuits. But a circular scratch that follows a data track may damage such a long continuous segment of data that it cannot be corrected.

ABOUT THE OPTICAL PICKUP

The Compact Disc player uses a solid-state semi-conductor diode laser, mounted on a tracking servo-mechanism, to play the disc. The laser illuminates the track of microscopic pits representing the digital data bits, while photo-diodes detect the reflected illumination from the disc and convert it into an electronic signal which is then decoded to recover the musical waveform in each stereo channel.

You cannot see the laser operating, because it operates at wavelength of 7800 Angstroms, which is in the infrared and thus invisible to the human eye.

The Compact Disc player is completely safe for children to use. The laser operates at very low power and is concealed within the player mechanism. Even when the player is disassembled, the laser remains sealed within an optical system that causes its light to focus only 1 millimeter from the lens and then diverge rapidly, reducing its intensity to negligible levels.

		TROUBLESHOOTING
	SYMPTOM	POSSIBLE CAUSE	SOLUTION
	NO POWER WHEN THE POWER BUTTON	• Poor or no power plug connection at	• Insert the power plug firmly into the AC
	IS SET TO ON	the AC outlet	outlet.
GB		• Trigger switch is set to Auto	• Switch the trigger switch to off position
	DISC PLAY DOES NOT START	• The disc is loaded upside down	• Reload the disc with the label side UP
		• The disc is too dirty	• Clean the disc
	NO SOUND	• Incorrect audio cable connections	• Connect the CD player to the
			amplifier/receiver correctly
		• Incorrect amplifier/receiver operation	• Make sure that the input selector on
			your amplifier or receiver is set to CD
	SOUND SKIPS	• The CD player is subject to vibration or	• Change the installation location
		physical shock from external sources
	REMOTE CONTROL DOES NOT WORK	• Batteries in Remote Control handset	• Replace batteries
		have expired
		• Object obscuring remote sensor	• Remove any objects directly in front of
		on the player	the player
	A “HUMMING” SOUND CAN BE HEARD	• Loose cable connections	• Check the cable connections,
			particularly the phono connecting
			cables

,	HDCD ,		High Definition		Compatible Digitalnd		HDCD system manufactured	under license from	Microsoft
		®				®	Corporation. This product is	covered by one or	more of the
Microsoft™		are	either	registered		trademarks
							or
trademarks	of	Microsoft Corporation			in the	United States	following patents: In the USA: 5,479,168, 5,638,074, 5,640,161,
							and/or
other countries.							5,808,574, 5,838,274, 5,854,600, 5,864,311, 5,872,531, and in
							Australia: 669114. Other patents pending.

8