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12. Power Supply Unit (P.S.U)
Trouble in P.S.U
Is
power switch
on?
Yes
Is
fuse F001
O.K?
Yes
Is the
TH001 OK?
Is TR Q003
OK?
Yes
Is
voltage of T001
pin 1 130V
(370V)?
Yes
Is the
waveform of T001
pin 7 correct?
Yes
Is
voltage of C103
226Vdc?
Yes
Is
voltage of C105
185Vdc?
Yes
Is
voltage of C106
80Vdc?
Yes
A
30
No
Switch on
No
Check the power cord outlet
and diode bridge D001.
No
1. Replace Q003.
2. Replace TH001.
No
Trouble in bridge diode
D001 or peripheral
device.
No
Trouble in T001, IC001 and
check cold soldering of IC001.
No
Trouble in D102, D103.
No
Trouble in D114, D115.
No
Trouble in D104.
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