Electrical Component Defects
SM 4-57 D017/D018/D019/D020
Trouble-
shooting
light whenever a copy is
made.
Shorted
The Paper Jam indicator
lights even if there is no
paper.
Open
The Paper Jam indicator will
light whenever a copy is
made.
Relay Sensor 702-1 CKB
Shorted
The Paper Jam indicator
lights even if there is no
paper.
Open SC120 is displayed.
Scanner HP Sensor 228-1 SIO
Shorted
The CPU does not detect
the scanner home position
and the scanner motor does
not stop.
Open
Shift Sensor 903-1 STB
Shorted
SC770 is displayed.
Open
TD Sensor 327-1 BCU
Shorted
SC390 is displayed.
Open
The Paper Jam indicator will
light whenever a copy is
made.
Upper Relay Sensor 307-4 BCU
Shorted
The Paper Jam indicator
lights even if there is no
paper.
 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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