Mitsubishi PD-5030, Руководство по обслуживанию

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3-15
In the state that the speaker cable is discon-
nected, is the audio signal output available at
the speaker terminal?
Is the voltage output specified below available
at each pin of the PA connector in the AUDIO
PWB?
The speaker or the speaker
cable is fault.
NO
Audio errors
YES
YES
Is the waveform specified below output to the
AU connector of the AUDIO PWB?
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.
The AUDIO PWB is fault.
YES
The power unit or the PA con-
nector is fault.
NO
The MAIN PWB or the AU con-
nector is fault.
NO
Pin No. Name Voltage
1 S+12 12Vdc
2 S+12 12Vdc
3 S+12 12Vdc
4 GND GND
5 GND GND
6 GND GND
Pin 6
Pin 7
Pin 5
Pin 1,3 • • • Audio signal waveform
5Vpp
5Vpp
3.5Vdc