Handling Compact Discs; Cleaning Discs - NAD C 542 Manuel D'installation

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
NO POWER WHEN THE POWER BUTTON
IS SET TO ON
GB
DISC PLAY DOES NOT START
NO SOUND
SOUND SKIPS
REMOTE CONTROL DOES NOT WORK
A "HUMMING" SOUND CAN BE HEARD
Microsoft™
trademarks of Microsoft Corporation in the United States and/or
other countries.
8
SYMPTOM
, HDCD , High Definition Compatible Digital
®
are either registered
(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
POSSIBLE CAUSE
• Poor or no power plug connection at
the AC outlet
• Trigger switch is set to Auto
• The disc is loaded upside down
• The disc is too dirty
• Incorrect audio cable connections
• Incorrect amplifier/receiver operation
• The CD player is subject to vibration or
physical shock from external sources
• Batteries in Remote Control handset
have expired
• Object obscuring remote sensor
on the player
• Loose cable connections
HDCD system manufactured under license from Microsoft
and
®
Corporation. This product is covered by one or more of the
trademarks or
following patents: In the USA: 5,479,168, 5,638,074, 5,640,161,
5,808,574, 5,838,274, 5,854,600, 5,864,311, 5,872,531, and in
Australia: 669114. Other patents pending.
SOLUTION
• Insert the power plug firmly into the AC
outlet.
• Switch the trigger switch to off position
• Reload the disc with the label side UP
• Clean the disc
• Connect the CD player to the
amplifier/receiver correctly
• Make sure that the input selector on
your amplifier or receiver is set to CD
• Change the installation location
• Replace batteries
• Remove any objects directly in front of
the player
• Check the cable connections,
particularly the phono connecting
cables