Electromagnetic Compatibility (Emc) − Troubleshooting - Porsche 996 TT Repair Manual

and connect.
4. Check the ground connection with an
ohmmeter at the negative terminal of the
battery.
Noise still present?
3
5. Check all connections of the amplifier.
6. As an experiment, insert a functional
amplifier in place of the suspected
defective one.
Noise still present?
4 Disconnect the audio inputs from the amplifier,
whereby the connections for terminals 30, 15 and
ground must be maintained.
Noise still present?
5 If the amplifier is switched on via a relay, remove
the relay and connect the amplifier directly to the
power supply.
Noise still present?
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Electromagnetic compatibility (EMC) − Troubleshooting
Note
• Check the complaint to make sure that the symptoms really exist.
Work instruction
1 Is the vehicle equipped with retrofitted
accessories (radar detector, two−way radio,
mobile telephone)?
Electromagnetic compatibility (EMC) − Troubleshooting
einordnung
' Step 4
' Step 5
7. Localise the battery
connecting cable of the
amplifier.
8. Cut this cable.
9. Install an
interference filter at
the cut point.
' End
Yes
Remove the accessories /
take them out of operation
' Step 2
Replace
amplifier
' End
Repair the
audio
connecting
cable, lay it
again or replace
' End
Replace the
closing relay of
the amplifier
' End
No
Collect information
about the complaint:
Which reception
ranges are affected?
With engine
switched on or off?
1731