ELECTRICAL COMPONENT DEFECTS 10 February 2005
4-24
Component
(Symbol)
CN Condition Symptom
Open
A paper jam is detected when paper is fed; and
the paper jam is not cleared when the paper is
removed.
Paper feed
sensor 2
340
(I/O board)
Shorted
A paper jam is detected when paper is fed; and
the paper jam is not cleared when the paper is
removed. Or, a paper jam is detected before
paper is fed.
Open Paper near end is detected when the tray is full. Paper near-end
sensor 1
406
(High voltage
supply)
Shorted
Paper full is detected when the tray is almost
emptily.
Open
Paper end is detected when the tray is not
empty.
Paper near-end
sensor 2
308
(I/O board)
Shorted
• Paper full is detected when the tray is almost
empty.
• Paper near-end is detected when the tray is
full.
Open
Paper overflow is not detected when the paper
exit tray is full.
Paper overflow
sensor
324
(I/O board)
Shorted
Paper overflow is detected when the paper exit
tray is not full.
Open The original size is not correctly detected. Platen cover
sensor
219
(Scanner I/O
board)
Shorted
No symptom
Open
A paper jam is detected when paper is fed; and
the paper jam is not cleared when the paper is
removed.
Registration
sensor
405
(High voltage
supply)
Shorted
• A paper jam is detected when paper is fed;
and the paper jam is not cleared when the
paper is removed.
• A paper jam is detected before paper is fed.
Open SC120 is displayed. Scanner HP
sensor
240
(SBU)
Shorted
The scanner motor tries to operate for about 40
seconds before SC122 is displayed.
Open SC220 is displayed. Synchronization
detector
503
(LDB)
Shorted
The machine does not respond.
SC220 is displayed.
Open Bottle full is not detected when the bottle is full. T/B waste toner
bottle full
sensor
307
(I/O board)
Shorted
Bottle full is detected when the bottle is not full.
Open SC460 is displayed. Temperature/hu
midity sensor
259
(BICU)
Shorted
SC460 is displayed.
Open
A paper jam is not detected when paper is fed.
Fusing
entrance
sensor
307
(I/O board)
Shorted
A paper jam is detected when paper is not fed.
Open
A paper jam is not detected when paper is fed.
Transfer belt
sensor
307
(I/O board)
Shorted
A paper jam is detected when paper is not fed.
NOTE: An SC condition occurs only when a new PCU is being installed in the
machine. During copying, if the ID sensor fails, the image density will be
changed.
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