Mitsubishi Electric PD-5010 Service Manual page 26

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.
Is the audio signal present at the speaker OUT?
Are the voltages specified below available at the
PA connector of the AUDIO unit?
(Power source check)
Pin Signal name
1 S+24
2 S+24
3 S.GND
4 S.GND
5 A+13
6 A.GND
Are the following waveforms observed at the AU
connector of the AUDIO unit?
Pin 6
Pin 7
Pin 5
Pin 1, 2 : Audio signal waveforms
The AUDIO unit is out of order.
NO
Voltage
+23.5~33Vdc
+23.5~33Vdc
GND
GND
+13Vdc
GND
YES
5Vp-p
5Vp-p
4.8Vdc
YES
YES
Speaker or cable is defective.
YES
The POWER unit or the cable 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.
NO
The MAIN PWB or the cable is out
of order.
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