Mitsubishi Electric PD-5010, Руководство по обслуживанию

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3. No audio output generated
Note) This model is enabled to set up an audio input terminal for each video input terminal. No audio output is
available unless the input terminal of the displayed pictures (example: VIDEO 1) coincides with that of
audio (example: RGB 3). Therefore, analysis for troubleshooting should be carried out after the displayed
video input terminal (example: VIDEO 1) has been made to coincide with the audio input terminal accord-
ing to the instruction manual.
Enter a signal input in AUDIO IN.
YES
Is the audio signal present at the speaker OUT? Speaker or cable is defective.
NO
YES
Are the voltages specified below available at the The POWER unit or the cable is out
PA connector of the AUDIO unit? of order.
(Power source check)
Pin Signal name Voltage
1 S+24 +23.5~33Vdc
2 S+24 +23.5~33Vdc
3 S.GND GND
4 S.GND GND
5 A+13 +13Vdc
6 A.GND GND
YES
NO
Are the following waveforms observed at the AU The MAIN PWB or the cable is out
connector of the AUDIO unit? of order.
YES
The AUDIO unit is out of order.
(Note) When confirming the source volt-
age by disconnecting the PA con-
nector, short-circuit the section be-
tween Pins
3 4
of the PA con-
nector and Pin
6
(like short-circuit-
ing between S.GND of the POWER
unit), and then turn on the POWER
unit.
Pin 6
Pin 7
Pin 5
Pin 1, 2 : Audio signal waveforms
5Vp-p
5Vp-p
4.8Vdc