Pioneer PDP-42A3HD Training & Troubleshooting Manual page 69

A/V Inspection
No digital audio output
Preliminary Checkpoints
If the SPDIF output is not working while the system is normal (Including MPEG
play and A/V output), check for any problems with the SPDIF output of CPU.
Waveform 13
< Waveform 13 >
No IEC958 Digital Output
Check the IEC958 output
signal J5 of U2
OK
Check for other
defective modes
69
NG
Check the path between
CPU and IEC958 line
(Incorrect insertion, poor soldering,
short circuits, damage, etc.)