No.
Sensor Name/
Sensor Board Name
Active
CN No./
Pin No.
Condition Symptom
Shorted
26 Fusing Set Sensor
L
L
CN209/3
CN209/4
Open
“Reset Fusing Unit
correctly” is displayed.
Shorted
27 Top Cover Sensor H CN208/2
Open
“Close Top Cover” is
displayed.
Shorted
Top cover open cannot
be detected.
28 LDU Shutter Sensor H CN207/17
Open
SC270
Shorted
29 Registration Sensor L CN207/14
Open
Paper Jam A
Shorted
30 Paper Width Sensor H CN207/11
Open
Always, small paper is
detected, causing slow
printing.
Shorted
Small paper size is not
detected.
31
Paper Height Sensor
1/2
H
CN207/5
CN207/8
Open Remaining paper volume
is wrong on Web Image
Monitor.
Shorted
32 Paper End Sensor H CN2072
Open
Paper end is detected
even if paper is placed in
the paper tray.
Shorted
Paper end is not detected
even if there is no paper
in the paper tray, causing
a paper jam.
4. Troubleshooting
134
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