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11. Power Supply Unit (P.S.U)
Is the
IC001
O.K?
Replace IC001
No
Is
voltage of C104
50Vdc?
No
Is
voltage of D002
130V (270V)?
Trouble in switching
power transformer T001
or IC001 and its ambient
circuit
Trouble in diode
D001,D002,D003,D004
or peripheral device
No
Is the
waveform of T001
pin5 correct?
Trouble in T001
or D101
No
Trouble in P.S.U
Is
power switch
on?
Switch on
No
Yes
Yes
Yes
Yes
Yes
Yes
Is
voltage of C102
100Vdc?
Trouble in T001 or D102
No
Is
fuse F001
O.K?
Check the power cord outlet
and diode D001,D002,D003,D004
No
A