Check radio aerial reception

Check 5570TB

Irrespective of the position of the key, switch on the radio by pressing the 'VOL PUSH ON/OFF knob (A) for more than a second.

Voltage reading for signal coming from the radio aerial

Press buttons '3' (B) and '6 RND (C) at the same time. The acoustic test at the speakers has started. Press button '3' (B) again to enter this mode.

An indication of the intensity of the radio tuner output signal, expressed as a voltage (e.g. 'SIGNAL STRENGTH 1.6 V) will appear on the display.

Diagnosis of short circuit (audio channels and radio aerial) and open circuits (radio aerial).

Press buttons '3' (B) and '6 RND (C) at the same time. The acoustic test at the speakers has started. Press button '6 RND (C) again and check that the words 'SHORT CIRCUIT - OK appear on the display.

If there is a short circuit at one or more of the speakers, a list of components will appear on the display with an X at the side indicating the faulty speaker. The presence of a mark indicates that the channel(s) is(are) not short circuited.

LF = left front audio channel

RF - right front audio channel

LR = left rear audio channel

RR = right rear audio channel

X = audio channel short circuited

Mark = audio channel not short circuited

If the words 'AERIAL: GND SHORT appear, this indicates a short cirtcuit to earth at the radio aerial intake;

If the words AERIAL: BATT. SHORT appear, this indicates a short circuit to the battery positive at the radio aerial intake;

If the words 'AERIAL: OPEN CCT appear, this indicates an open circuit to the radio aerial intake.

Where several faults are present at the same time, the respective signals will be shown on the displayed alternately (rolling) lasting around 2 seconds for each message.

To exit the diagnostic procedures, switch off the radio by pressing the 'VOL PUSH ON/OFF button (A) for more than a second and/or turn the ignition key OFF.