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MX-FNX4 OPERATIONAL DESCRIPTION 5 – 25
7. Detecting jams
A. Detecting jams in finisher
The following sensors are used to detect the presence/absence of paper and to make sure that sheets are moved properly:
• Inlet sensor (FED)
• Feed path sensor (FPDD)
A jam is identified with reference to the presence/absence of paper at each specific sensor at the times programmed in the memory of the
microprocessor (CPU) on the finisher controller PCB.
When the CPU identifies a jam, it suspends the finisher's delivery operation and informs the host machine DC controller of the presence of a
jam. After the paper jam is removed, and all the doors are closed, the finisher checks whether or not paper is being detected by the above two
sensors (inlet sensor, No.1 delivery sensor). If the sensors detect a copy, the finisher unit judges that paper jams have not completely been
removed, and sends the paper jam removal signal to the host machine again.
• Inlet sensor (FED)
• Feed path sensor (FPDD)
A jam is identified with reference to the presence/absence of paper at each specific sensor at the times programmed in the memory of the
microprocessor (CPU) on the finisher controller PCB.
When the CPU identifies a jam, it suspends the finisher's delivery operation and informs the host machine DC controller of the presence of a
jam. After the paper jam is removed, and all the doors are closed, the finisher checks whether or not paper is being detected by the above two
sensors (inlet sensor, No.1 delivery sensor). If the sensors detect a copy, the finisher unit judges that paper jams have not completely been
removed, and sends the paper jam removal signal to the host machine again.
Jam type
Sensor
Jam condition
Code
Inlet sensor delay
FED
The inlet sensor (FED) does not detect paper sheet even if predetermined time
(distance) has passed after receiving delivery signal from the host machine.
(distance) has passed after receiving delivery signal from the host machine.
1001
Inlet sensor stationary
FPDD
The sheet does not move past from the inlet sensor (FED) even if predetermined
time (distance) has passed after the inlet sensor (FED) detects the sheet.
time (distance) has passed after the inlet sensor (FED) detects the sheet.
1101
Feed path sensor delay
FPDD
The delivery path sensor (FPDD) does not detect paper sheet even if
predetermined time (distance) has passed after the inlet sensor (FED) detects the
sheet.
predetermined time (distance) has passed after the inlet sensor (FED) detects the
sheet.
1004
Feed path sensor stationary
FPDD
The sheet does not move past from the feeder path sensor (FPDD) even if
predetermined time (distance) has passed after the feed path sensor (FPDD)
detects the sheet.
predetermined time (distance) has passed after the feed path sensor (FPDD)
detects the sheet.
1104
Premature arrival
FED
The inlet sensor (FED) detects paper before receiving delivery signal from the host
machine.
machine.
1200
Staple
FSHPD
When the staple motor (FFSM) is rotating clockwise, the staple home position
sensor (FSHPD) does not turn on within the predetermined period after it has
turned off. However, the sensor turns on within the predetermined period after the
motor (FFSM) has been rotated counterclockwise.
*Since the staple home position sensor (FSHPD) is incorporated in the stapler, the
stapler must be replaced if the sensor is malfunctioned.
sensor (FSHPD) does not turn on within the predetermined period after it has
turned off. However, the sensor turns on within the predetermined period after the
motor (FFSM) has been rotated counterclockwise.
*Since the staple home position sensor (FSHPD) is incorporated in the stapler, the
stapler must be replaced if the sensor is malfunctioned.
1500
Power ON
FED, FPDD
When power is supplied, either of the inlet sensor (FED) or delivery path sensor
(FPDD) detects a sheet.
(FPDD) detects a sheet.
1300
Door open
FCD, FFDD, FFDD
One of the upper cover open/close sensor (FCD), front cover open/close sensor
(FFDD), front cover close detector switch (FFDD) detects the open of the cover.
(FFDD), front cover close detector switch (FFDD) detects the open of the cover.
1400
FPDD
FED
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