BDS 580S (serv.man2) - Harman Kardon Audio Service Manual (repair manual). Page 13

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5-1                             Trouble shooting Chart 
Power on led doesn't work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                                     
                                                                                                                 
 
                                                                                                               
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
Power on led doesn't 
work  
GO 
Switch performance 
check 
OK 
Check the cable XP504 is 
connect well to Main board 
XP6
 
Change switch
 
NG
Reconnect the cable
 
NG
Refer to Power supply board part
 
NG
Check+5V,+12V,VCC_D  
voltage on the power and 
Main board
 
OK 
OK 
Replace the LED25---LED31
 
 
Check the power on led 
control circuit is OK
 
 
Replace the FB
 
NG
OK 
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