| STEP | CHECK TO BE PERFORMED | REMEDIAL ACTION IF THE CHECK IS NOT OK |
|---|
| 1 | Amplifier input signals check Turn on the radio and tune into a station with a steady signal that can be heard properly using the Examiner in voltmeter mode and connect the probes to pins 1 and 4 of the subwoofer (left audio input)Select a 20V end of scale and 5 seconds on the Examiner and press the start buttonAll the figures that appear should be evaluated with a tolerance of about 20%; the image should be similar to the one below.Repeat the test connecting to pins 2 and 5 (right audio input) | Restore the continuity/insulation of the wiring between the radio and subwoofer audio signals.If the previous check has not detected faults and the audio signal was interrupted at the radio output, replace the radio Op. 5570T80 CAR RADIO EQUIPMENT - R+R |
| 2 | Earth checkDisconnect the subwoofer connectorConnect an ohmmeter between pin 7 and earth, and check that the resistance is less than 1 ohm | Restore earth connection |
| 3 | Check the subwoofer amplifier enablement power supplyTurn the key to the ON positionSwitch the radio onConnect between pin 8 of the subwoofer connector and earth and check that the voltage is around 12 Volt | Restore the continuity of the wiring between pin A5 of the radio and pin 8 of the subwoofer.If the previous checks have not revealed any faults replace the subwooferOp. 5580T40 |
