Pioneer PDP-507CMX Service Manual page 111

5
Flowchart of Failure Analysis for The Audio System (AUDIO Assy)
Note: Before performing a failure diagnosis, be sure to check that the settings of the unit are properly made by referring to its
specifications and instruction manual.
If speaker outputs with different polarities or a speaker output and ground are short-circuited, the protection circuit is activated,
and audio will not be output. In this case, turn the power off at the Main Power Switch, make connections properly, then turn the
power back on again. The protection circuit will then be released.
Failure analysis for the
audio system ⇒AU1
No sound from the speaker
With the speaker cables
disconnected, are audio signals
Yes
output from the speaker terminals?
Waveform 41
No
Is an audio signal input of the
Yes Is the video slot card properly
video slot to the main unit NOT
output although an audio signal
input to AUDIO 1 or 2 is output?
No
Is either of the audio signals input Yes Failure in the IC5308 or the poor
to AUDIO INPUT 1 or 2 of the
monitor output when selected?
No
Yes
Is the green POWER indicator
repeating a burst of 5 flashes?
No
Is the voltage at Pin 9 of IC3002
4 V or higher?
Yes
A
5
6
Failure in the speakers or
speaker cables
installed?
Yes
Are audio signals inputted to
IC5308 pin5?
Waveform 42
Yes
Failure in the IC5308
connection of the AUDIO input
terminal
Does the green POWER indicator
repeat a burst of 5 flashes even
after the CN3004 (AU connector)
cable is disconnected?
Yes
Failure in the MAIN Assy or the
CN3004 (AU connector) cable
Is the voltage at Pin 9 of IC3002
No
4 V or higher after the CN3004
(AU connector) cable is
disconnected?
Yes
Failure in the MAIN Assy or the
CN3004 (AU connector) cable
6
7
No
Install the video slot card properly.
Failure in the VSIF Assy, PCB
No
connectors, or video slot card.
If the audio signal is output after
the video slot card is replaced by
a normally operating one, the
removed video slot card was
defective.
No
Failure in the AUDIO Assy
No
Failure in the IC3002
PDP-507CMX
7
8
A
B
C
D
E
F
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