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E.3-2 POWER ERROR
E3-2.1 POWER DOES NOT TURN ON
CHECK THE POWER JACK1
IS DAMAGED¡ H
NO
CHECK THE CONNECTORS
AND WIRE (P/B TO D/B),
NO
CHECK THE POWER SWITCH
(D/B SW1) is damaged
NO
CHECK POWER BOARD
Q12,Q13,D13,L5 ARE DAMAGED?
NO
CHECK THE PIN2 OF U2 (P/B)
VOLTAGE IS 3.3V?
NO
CHECK THE PIN4 OF U9, U11,
U12, U13, U23 ARE NOT "H"
CHECK D/B OSC
Y1(PIN 3):12.1875MHZ
Y2(PIN 3):12.2725MHZ
NO
REPLACE Y1 ,Y2
YES
YES
NO
REPLACE POWER JACK1
YES
RESOLDER CONNECTORS
YES
REPLACE SW1(D/B)
YES
REPLACE Q12,Q13, D13,L5
REPLACE P/B U2
REPLACE U9, U11
YES
U12, 13, U23
38
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