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Are the power cord and harness in the
unit
If F1 normal
Does DB1 output 155V when AC
input 110V?
Is the voltage of +12V applied to pin
4,8,9,14 of CN201?
Is PFC output 370V as for power on/off
switch when is on?
Is VLED output 27V as for power on/off
switch when is on?
Power unit operation check for E60-C3
YES
YES
?
YES
YES
NO
YES
NO
YES
NO
NO
Power cord and harness in the unit
connected
NO
Line filter unit? L1 ,L2,L3 or RT1,RT2 is
out of order?
NO
Change a new full-wave rectifier diode to
check the output voltage.
Does the standby circuit normal?. (Q1, T1,
D201 , D2 , Q201,Q202,Q204,Q205 & the
circuit around the U1 and protection circuit
ect. is checked)
Does the U101 , Q103 ,T101,D105 and the
circuit around IC U101?or Q104,U102?
Check them.
Does the U301,T301, Q301, Q302,
D303,D304 and the circuit around IC
U301?or Q104,U102? Check them.
37
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