No audio output
Check the U915 power supply
Check the U6 power supply
(U6’4=-12V and U6’8=12V)
Check whether the audio
signal is right from the
U6’1,7
Check If the C511,C501
is on
Add the two set
Yes
No
Go
Check whether the audio signal
is right from the U915’9,10,11,12
No audio output
Yes
Trouble shooting chart
4-2
Replace the U915
Replace the U6
Yes
NO
NO
