Read JBL SB 100 Service Manual online
5-5 Trouble shooting Chart
No sub output
No
No sub output
Go
Check power supply
Yes
No
Yes
Check the voltage, clock and
data of U101 and U714
Check U11 and its network
Check U11
PIN9:3.3V
Check PIN26 and PIN 27 of U714
whether normal or not
JBL
SB 100 Service Manual
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