SB 35 Sabre (serv.man5) - Harman Kardon Audio Service Manual (repair manual). Page 11

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5-7                             Trouble shooting Chart 
Optical in does not work 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
   
 
Optical in does 
not work 
Go 
No 
Check and replace Q207/Q209
 
No 
Replace U721
 
Check STBY_3V3 of R784 in Aux-in Board 
whether normal or not 
Check the output signal of U721 in Aux-in 
board whether normal 
or  not
 
Yes 
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SB35 SABRE Service Manual
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