JBL SB 100 Service Manual ▷ View online
5-3 Trouble shooting Chart
Remote control does not work
Remote control
does not work
Go
No
Replace the battery for remote
control
Yes
Check the +3.3V net on IR Board to
Main Board XP062
No
Yes
Replace IR1
Check battery of remote control whether
exhausted or not.
Check power supply of IR1 on IR Board
whether normal or not
XS4 Pin5 :+3.3V
JBL
SB 100 Service Manual
Page 21 of 49
5-4 Trouble shooting Chart
No audio output
No audio output
Go
No
Yes
Yes
No
Replace the AMP IC
NO
Fix or replace the
power board
Check voltage +18V (18V for TPA3116)
whether normal or not at on the main board
Check the voltage of AMP output whether
normal or not (about 9V)
Check the voltage, clock and Data of
U101 and U714
Check the 18V network and the power
board
JBL
SB 100 Service Manual
Page 22 of 49
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
Page 23 of 49
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
on Main Board whether normal or not
Check Main Board U12 and U13 Pin1,
signal input whether right or not
signal input whether right or not
Check the input signal of U714
whether normal
whether normal
or not
Check the Aux connector
whether normal or
not
Fix the connector
Yes
No
JBL
SB 100 Service Manual
Page 24 of 49
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