Electrical Component Defects
SM 4-55 D017/D018/D019/D020
Trouble-
shooting
lights even if there is no
paper.
Open
The Paper Jam indicator will
light whenever a copy is
made.
Lower Relay Sensor 308-4 BCU
Shorted
The Paper Jam indicator
lights even if there is no
paper.
Open
The TD sensor initial setting
procedure is not performed
when a new PCU is
installed.
New PCU Detect
Sensor
327-6 BCU
Shorted
The TD sensor initial setting
procedure is performed
whenever the front cover is
closed.
Open
The Paper End indicator
lights even if paper is placed
in the 1st paper tray.
Paper End Sensor
(Bypass)
860-3 BCU
Shorted
The Paper End indicator
does not light even if there
is no paper in the 1st paper
tray.
Open
The Paper End indicator
lights even if paper is placed
in the 1st paper tray.
Paper End Sensor
(Duplex)
860-3 BCU
Shorted
The Paper End indicator
does not light even if there
is no paper in the 1st paper
tray.
Paper Exit Sensor 324-1 BCU
Open The Paper Jam indicator will
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