Porsche 996 TT, Repair Manual

Page: 1787 / 2099

amplifier.
8. Disconnect the lead on the
amplifier side.
9. Insert an interference
filter.
10. The negative terminal of
the interference filter
should be installed facing
towards the amplifier.
Interference noises remedied?
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Interference noises
Note
This procedure is designed to help you find out how the interference noise has entered the system.
•
In the following subchapters, the various interference noises are differentiated. •
The battery must be fully charged. •
No charging unit may be connected.
•
Work instruction Yes No
1 Does the interference noise
complained about by the
customer really exist? Disconnect all electrical connections to
retrofitted accessories, such as two−way radios,
mobile telephones, radar detectors, etc.
’ Step 2 ’ End
2 Can the interference noise be
heard in all the loudspeakers? Slowly pull the receiver component(s) out of
the holder and observe the noise. Does the
interference noise change or disappear in the
process?
Yes ’ Step 4
No ’ Step 3 => Interference
noises, checking
cable
connections
3 Disconnect the antenna from
the radio and observe the
interference noise.
Does the interference noise
change or disappear? => Interference noise due to antenna => Interference
noises due to all
looudspeakers
4 Does the interference noise
change? => Interference noises due to alternator
=> Interference noises due to engine
=> Interference noises due to power supply => Interference
noises due to all
looudspeakers
einordnung
Interference noises 1724