9 March 2004 ELECTRICAL COMPONENT DEFECTS
4-11
Trouble-
shooting
4.2 ELECTRICAL COMPONENT DEFECTS
4.2.1 SENSOR/SWITCH OPEN ERRORS
Sensor Connector Message Remarks
CN127 Registration
Sensor
SN
Paper jam
CN129 Paper End Sensor
SN
Load paper
CN130 Bypass Paper End
Sensor
SN
Load paper The red LED in the fax key lights
when the application program
tries to print out a document.
CN137 Paper Path
Sensor
SN
Paper jam
CN128 Exit Sensor
SN
Paper jam
CN132 Image Density (ID)
Sensor
SN
(None) Print quality may become worse.
CN123 SC901 The connector is shared with the
mechanical total counter.
Toner Density
(TD) Sensor
PCU Reset PCU correctly
CN126 SC120 Scanner HP
Sensor
Sensor SC120
CN126 SC120 Platen Cover
Sensor
SN (None) The copier does not warm up
when you open the platen cover.
DF CN305 Cover open ADF Guide Open
Sensor
SN Cover open
DF CN305 Cover open ADF Original Set
Sensor
Sensor (None) Originals are not detected.
DF CN305 Cover Open ADF Registration
Sensor
SN Paper jam Originals are correctly
transported.
CN114 Right door open Front Door Switch
SW Front/Right door open The message depends on which
circuit is open (white
→
front;
blue → right).
CN114 Right door open Right Door Switch
SW Right door open
CNxxx: The connector on the BICU board.
DF CNxxx: The connector on the ADF connection board.
SN: The connector on the sensor.
SW: The connector on the switch.
PCU: The connector on the PCU.
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