Toyota Celica 2005 Repair Manual page 2267

BE−92
Glass Printed Antenna
Noise
Noise
Noise
Noise
Noise
2005 CELICA (RM1131U)
BODY ELECTRICAL
Signal
Radio
N21545
− AUDIO SYSTEM
(b) Matters that require attention when checking:
Noise coming into the radio usually has no harm for
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practical use as the noise protection is taken which
prevent an extremely loud noise to come in. When
extremely loud noise comes into the radio, check if
the grounding is normal where the antenna is
installed.
Check if all the regular noise prevention parts are
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properly installed and if there is any installation of
non−authorized parts and non−authorized wiring.
If you leave the radio out of tune (not tuning), it is
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easy to diagnose the phenomenon as noise occurs
frequently.
(c) Antenna and noise:
Electronic signal received by the antenna will reach to the
radio transmitted through the core wire of the coaxial
cable. Any noise wave other than radio wave is mixed into
this core wire, that causes noise in the radio and poor
sound quality. In order to prevent these noises from mix-
ing into the radio, the core wire inside the coaxial cable is
covered with a mesh wire called shield wire. This shield
wire shelters the noise and transmits it to the ground and
thus preventing noise from mixing in. If this shield wire has
grounding failure, that causes noise.
5. COMPACT DISC PLAYER
Compact Disc Players use a laser beam pick−up to read the dig-
ital signals recorded on the CD and reproduce analog signals
of the music, etc.
HINT:
Never attempt to disassemble or oil any part of the player unit.
Do not insert any object other than a disc into the magazine.
NOTICE:
CD players use an invisible laser beam which could cause
hazardous radiation exposure. Be sure to operate the play-
er correctly as instructed.
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