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BD 300 (serv.man2) - JBL Audio Service Manual (repair manual). Page 10

Read JBL BD 300 (serv.man2) Service Manual online

 
 
 
No audio output 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
                                                                                 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
refer to <
NO +32V 
output
> 
Check 32v(BD100 is 20V) 
voltage on AMP board is 
normal 
Check the signals of I2S 
(XP11 Pin 1,2,3,4,5,7)
 
Check the connect line is OK 
Yes 
No audio output 
Trouble shooting chart
Yes 
NO 
NO 
Check  U801’s output(U801 
pin4,8,12,) is right,    check the 
signal of Valid    (R774 )is high
Yes 
Check U7 is output 
is,C12,A12,B12,C11,D11,D12, 
 
NO
Yes 
Check AMP IC 
U710/U711/U712 is right
 
Replace U710/U711/U712 
NO
Replace the speaker
 
5- 2
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SB 300 Service Manual
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