HT-DV40H (serv.man3) - Sharp Audio User Guide / Operation Manual. Page 77

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HT-DV40H
HT-DV50H

When  you  load  an  unplayable  disc  or  fail  to  perform  operations
properly, the following messages are displayed on the unit and the
TV screen.

(*): Set the main unit to the stand-by mode and turn the power on
again, or  unplug  and  plug  it  back  in. Should  the  same  message
appear, contact your authorised SHARP dealer or service centre.

Compact discs are fairly resistant to damage, however mistracking
can occur due to an accumulation of dirt on the disc surface. Follow
the guidelines below for maximum enjoyment from your CD
collection and player.

Do not write on either side of the disc, particularly the non-label
side from which signals are read. Do not mark this surface.
Keep your discs away from direct sunlight, heat, and excessive
moisture.
Always hold the CDs by the edges. Fingerprints, dirt, or water on
the CDs can cause noise or mistracking. If a CD is dirty or does
not play properly, clean it with a soft, dry cloth, wiping straight out
from the centre, along the radius.

Periodically wipe the cabinet with a soft cloth and a diluted soap
solution, then with a dry cloth.

Do not use chemicals for cleaning (petrol, paint thinner, etc.). It
may damage the cabinet finish.
Do not apply oil to the inside of the unit. It may cause
malfunctions.

Malfunction of surround circuit.
Place the unit away from noise source and
plug the AC power lead into another wall
socket. (*)

The unit considers the DVD mechanism is
defective. (*)

The cooling fan on the rear of the unit does
not run. Unplug the AC power lead and
check if foreign object get caught around the
cooling fan.

The disc is not loaded.

The digital audio input socket is not 
connected properly.
Unspecified signal is received and cannot
be recognised.

When copyright protected WMA file is
played back.