BDS 580S (serv.man2) - Harman Kardon Audio Service Manual (repair manual). Page 22

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5-10                             Trouble shooting Chart 
COAX/OPTICAL does not work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
COAX/OPTICAL 
does not work 
Go 
Check the DVD mode is 
OK,audio output is ok 
No 
Replace the Main board
 
Check the coax/optical 
 
connector is ok 
Yes 
Replace the connector 
No 
Yes 
Replace U23 CS8422
 
Check U23 CS8422  
is broken. 
 
Check the U28 
 
No 
Yes 
Check U23 
PIN3,PIN22 +3.3V
 
Yes 
Check the main board U23 
power supply circuit 
No 
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