Read JBL SB 100 Service Manual online
5-1 Trouble shooting Chart
No power supply on power board
No power supply
Go
Yes
Fix or replace CN503
No
Check BD1, whether more than 85V AC or
not
No
Replace BD1
No
Check U531, T5311 and their network, then
fix them
No
Yes
Yes
Yes
Fix or replace F501
No
Check U531, U533 and
their network and fix
them
Check CN503
Input AC 90V and check the output of DC
18V
Check CE502, whether more than 120V DC
or not
or not
Check CE532, about 10V DC
JBL
SB 100 Service Manual
Page 19 of 49
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