Mazda RX-8 Workshop Manual page 3330

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2011 - RX-8 - Body and Accessories
CONFIRMATION STEP 1: RECEPTION CONDITION SYMPTOM (EXAMPLE)
[RADIO]
Symptom
Only a buzzing sound
from the speakers
A buzzing or crunching
sound and normal
sound produced at the
same time from the
speakers
A thumping sound and
normal sound produced
at the same time from
the speakers (FM only)
Antenna signal condition
There is no broadcasting wave.
Signals from antenna to audio
unit/car-navigation unit are not
transmitted.
Though signals are transmitted
from antenna to audio
unit/car-navigation unit,
electric noise from other
sources is larger.
Noise occurs due to radio
wave environment at specific
places (e.g. in valleys between
buildings). Noise varies when
own vehicle or surrounding
vehicles moves. (FM only)
Source
Electric noise
caused by the
operation of
internal circuit
from audio
unit/car-
navigation unit
itself
Atmosphere noise
Electrical noise
caused by
operation of
electrical
component on
vehicle
Electrical noise
from high tension
wire, transformer
substation
(factory),
electrical feeder
line (street car),
or motorcycle.
Interference
between direct
and reflected
waves of FM
signals causes
noise (Multipass
noise).