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Pioneer PDP-42A3HD Service Manual page 98

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1
A/V Inspection
No Audio Output
A
Preliminary Checkpoints
If no audio is output through JP800 while the system is normal, first check the
CPU AUDIO output and clock. [I2S interface ].
If no problems were found, check the U671 for Audio DAC.
B
Waveform 10
Ch1:SCLK,
Ch2:LRCLK,
Ch3:ADATA0
C
Waveform 11
D
Useful Tips
1. The Audio problem largely from the defect of CPU, Audio DAC or incomplete soldering of the parts located along
the audio output path.
2. Audio DAC pins represent serial data, LR clock, Bit clock and system clock, respectively.
E
F
T21
< Waveform 10 >
98
1
2
No Audio Output
OK
Check the CPU
12S output
OK
Check the Audio clock
Pin 9 of U261
OK
Check the Audio DAC for
U761
OK
Check for other
defective modes
PDP-42A3HD
2
3
NG
Check the path between
CPU and Clock
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)
Check the X-TAL and U261
NG
(Incorrect insertion, poor soldering,
short circuits, damage, etc)
Check the path between
NG
Audio DAC and CPU
(Incorrect insertion, poor solding,
short circuits, damage, etc)
< Waveform 11 >
3
4
T21
4

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