Electrical Component Defects
SM 4-51 D017/D018/D019/D020
Trouble-
shooting
4.6 ELECTRICAL COMPONENT DEFECTS
4.6.1 SENSORS
Component CN PCB State
Open
1st Bottom Fence
Sensor 1
309-1 BCU
Shorted
The CPU cannot detect the
paper size properly.
Open
1st Bottom Fence
Sensor 2
309-4 BCU
Shorted
The CPU cannot detect the
paper size properly.
Open
1st Bottom Fence
Sensor 3
309-7 BCU
Shorted
The CPU cannot detect the
paper size properly.
Open
The Paper End indicator
lights even if paper is placed
in the 1st paper tray.
1st Paper End Sensor 307-1 BCU
Shorted
The Paper End indicator
does not light even if there
is no paper in the 1st paper
tray.
Open
1st Paper Height
Sensor 1
310-1 BCU
Shorted
The CPU cannot determine
the paper near-end
condition properly.
Open
1st Paper Height
Sensor 2
310-4 BCU
Shorted
The CPU cannot determine
the paper near-end
condition properly.
Open SC501 displays.
1st Paper Lift Sensor 306-1 BCU
Shorted
Paper jam will occur during
copying.
Open
1st Side Fence Sensor 309-10 BCU
Shorted
The CPU cannot detect the
paper size properly.
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