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SB 100 - JBL Audio Service Manual (repair manual). Page 24

Read JBL SB 100 Service Manual online

5-6                             Trouble shooting Chart 
AUX in does not work 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
 
AUX in does not 
work 
Go 
No 
Check the power supply
 
 
Yes 
Check AUX IN connector   
No 
Yes 
Check the voltage, clock and 
data of U101 and U714
 
Replace U12 and U13 
No 
Yes 
Check voltage at U12 and U13 PIN7:3.3V 
on Main Board whether normal or not 
 
Check Main Board U12 and U13 Pin1, 
signal input whether right or not 
 
Check the input signal of U714 
whether normal 
or not
 
Check the Aux connector 
whether normal or 
not
 
Fix the connector 
Yes
No 
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