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Troubleshooting for the POWER circuit
Failure in POWER ON
Is the POWER LED lit?
YES
Flash in greenTo 1
(Fan error detected)
Flash in red
To 2
(Thermal error detected)
Flash in green and red
To 3
(Panel cracks detected)
Lit in green
To 4
NO
Is the outlet correctly connected?
Is 100V AC available behind the
F1 and F2 fuses?
Are there outputs of M+14V and
M+7V at Pins
PM connector?
2
Is there an output of M+5V at Pin
(MAIN) of IC9504?
5
Is there an output of M+5V at Pin
of the LD connector, Pin
the PW connector, and Pin
the RS connector?
Fault in IC9501 and its peripheral
circuits
NO
YES
YES
NO
1
3
and
of the
YES
NO
YES
NO
4
5
of
of
YES
TROUBLESHOOTING
Connect the outlet correctly.
Fuses F1 and F2 have
blown out.
Replace the fuses. If they
blow out again, the POWER
unit is out of order.
Try to disconnect the PW,
PQ, and RS connectors from
one after another. If the out-
puts of M+14V and M+7V
are found available, the cir-
cuits beyond these connec-
tors are out of order. If no
outputs are found, the
POWER unit is out of order.
Fault in S2601 (PWR) and
the related circuits
Fault in the +5V lines to
the respective LED PWB,
PWR PWB, and 232C PWB
4-12
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