26 July 2002 ELECTRICAL COMPONENT DEFECTS
4-21
Trouble-
shooting
4.4 ELECTRICAL COMPONENT DEFECTS
4.4.1 SENSORS
Component
(Symbol)
CN Condition Symptom
Open
A paper jam is detected when paper is fed; and
the paper jam is cleared when the paper is
removed
Fusing exit
sensor
324
(I/O board)
Shorted A paper jam is detected when paper is not fed.
Open No immediate symptom is seen. (☛ NOTE) ID sensor
258
(BICU)
Shorted
• The machine does not respond.
• No immediate symptom is seen. (☛ NOTE)
Open SC481 is displayed. Image transfer
belt mark
sensor
307
(I/O board)
Shorted
SC481 is displayed.
Open Bottle full is not detected when the bottle is full. O/B waste
toner bottle full
sensor
307
(I/O board)
Shorted
No symptom is seen.
Open No immediate symptom is seen. Oil end sensor
259
(BICU)
Shorted
The oil pump turns on to pump oil up when there
is enough oil.
Open SC571 is displayed. Oil overflow
sensor
259
(BICU)
Shorted SC571 is displayed.
Open
The original size is not correctly detected. Output
images are blurred.
Original length
sensor 1
104
(SBU)
Shorted
The original size is not correctly detected. Output
images are blurred.
Open
The original size is not correctly detected. Output
images are blurred.
Original length
sensor 2
104
(SBU)
Shorted
The original size is not correctly detected. Output
images are blurred.
Open
The original size is not correctly detected. Output
images are blurred.
Original width
sensor
104
(SBU)
Shorted
The original size is not correctly detected. Output
images are blurred.
Open
Paper end is not detected when the tray is
empty.
Paper end
sensor 1
406 (High
voltage
supply)
Shorted
Paper end is detected when the tray is not
empty.
Open
Paper end is not detected when the tray is
empty.
Paper end
sensor 2
340
(I/O board)
Shorted
Paper end is detected when the tray is not
empty.
Open A paper jam is detected when paper is fed. Paper exit
sensor
324
(I/O board)
Shorted A paper jam is detected when no paper is fed.
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 1
324
(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.
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