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11. Power Supply Unit (P.S.U)
Trouble in P.S.U
Is
power switch
on?
Yes
Is
fuse F001
O.K?
Yes
Is the
IC001
O.K?
Yes
Is
voltage of D002
130V (270V)?
Yes
Is the
waveform of T001
pin5 correct?
Yes
Is
voltage of C102
100Vdc?
Yes
Is
voltage of C104
50Vdc?
A
No
Switch on
No
Check the power cord outlet
and diode D001,D002,D003,D004
No
Replace IC001
Trouble in diode
No
D001,D002,D003,D004
or peripheral device
Trouble in switching
No
power transformer T001
or IC001 and its ambient
circuit
No
Trouble in T001
or D101
No
Trouble in T001 or D102
27
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