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3. Audio errors
(Caution)
In regard to the method of audio input setting, refer to the specifications and the instruction manual
to confirm that all the setting is free from errors. Since then, troubleshooting can be carried out. It
must be noted that the protector functions and no audio output is available if the opposing
electrodes of the speaker output or the speaker output and the ground (GND) are short-circuited.
In such a case, turn off the main power supply and make the connections correctly. The protector
is reset when the main power supply is turned on after that
Audio errors
In the state that the speaker cable is
disconnected, is the audio signal output
available at the speaker terminal?
NO
Is the voltage output specified below
available at each pin of the PA connector
in the AUDIO PWB?
Pin_NO
Name
1
S + 12
2
S + 12
3
S + 12
4
GND
5
GND
6
GND
YES
Is the waveform specified below output to
the AU connector of the AUDIO PWB?
Pin6
Pin7
Pin5
Pin 1,3 • • • Audio signal waveform
YES
The AUDIO PWB is fault.
52
YES
NO
Voltage
12Vdc
12Vdc
12Vdc
GND
GND
GND
NO
5Vpp
5Vpp
3.5Vdc
The speaker or the speaker
cable is fault.
The power unit or the PA
connector is fault.
The MAIN PWB or the AU
connector is fault.
8-16

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