BBK DK1410SI - 3.3.2 Troubleshooting flow chart

3.3.2Troubleshooting flow chart
1. Troubleshooting process for voltage too high or too low is shown as the following figure 3.3.2.1:
OK
N
Y
N N N
Change
D505 and
check whether it is
normal
Change
U5021 (2501)
and check whether it
is normal
Change
U503 (TL431)
and check whether it
is normal
Check
whether C509,
TC508 and TC509 have
electric leakage or
short circuit
Y
Y
Y
Figure 3.3.2.1 Troubleshooting flow chart for voltage too high or too low
Check relevant element of
feedback loop
N
OK
Y
Check whether filter
capacitor has electric
leakage or short circuit
Change
rectifier diode
of this circuit and check
whether it is
normal
Only one output too high or too low
Voltage too high or too low
Y
Change
corresponding element
Check
whether R513,
C513, R509 and R508
are normal
Multiple outputs too high or too low
N
OK
OK
OK
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