Electrical Component Defects
Sensor/Switch
Sensor Connector Message Remarks
Registration Sensor
CN127
Paper jam -
SN
Paper End Sensor
CN129
Load paper -
SN
Bypass Paper End
Sensor
CN130
(None)
The machine cannot detect paper
on the bypass tray.
SN
Paper Path Sensor
CN128
Paper jam -
SN
Exit Sensor
CN128
Paper jam -
SN
Image Density (ID)
Sensor
CN132
(None) Print quality may become worse.
SN
Toner Density (TD)
Sensor
CN123 SC901
The connector is shared with the
mechanical total counter.
PCU Reset PCU correctly -
Scanner HP Sensor
CN404 SC120 -
SN SC120 -
Platen Cover Sensor
CN404 SC120 -
SN (None)
The copier does not warm up when
you open the platen cover.
DF Guide Open
Sensor
DF CN04 Paper jam -
SN (None) -
6. Troubleshooting
190
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