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TROUBLESHOOTING GUIDE
1. NO POWER
TROUBLE IN
BULT-IN POWER
CHECK J801
5VST VOLTAGE
(5V) ?
NO
NO POWER
(POWER INDICATOR OFF)
TROUBLE
SOMEWHERE ELSE
TROUBLE IN
BULT-IN POWER
CHECK J801
INPUT VOLTAGE
(12V) ?
NO
TROUBLE IN
U501 or X501
NO
YES
YES
YES
CHECK
U501’s PIN 6.
IS THIS PIN
OSCILLATED?