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MX-FNX4  OPERATIONAL DESCRIPTION  5 – 25

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.

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.

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.

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.

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.

1104

Premature arrival

FED

The inlet sensor (FED) detects paper before receiving delivery signal from the host 
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.

1500

Power ON

FED, FPDD

When power is supplied, either of the inlet sensor (FED) or delivery path sensor 
(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.

1400

FPDD

FED

MX-FNX4  OPERATIONAL DESCRIPTION  5 – 26

The saddle stitch unit identifies any of the following conditions as a jam, and sends the jam signal to the host machine. In response, the host
machine may stop copying operation and indicate the presence of a jam on its control panel.
When all the doors are closed after the user has removed the jam, the saddle stitch unit checks whether the vertical path paper sensor
(FSVPPD) has detected the presence of paper. If the sensor has detected paper, the unit will identify the condition as being faulty jam removal
and send the jam signal to the host machine once again.

FSPIND

FS1PD

FS2PD

FS3PD

FSVPPD

FSPDD

FSPPPD

FSLGTD

FSLGHPD

No.

Name of sensor

FSPDD

Delivery sensor

FSVPPD

Vertical path paper sensor

FS1PD

No.1 paper sensor

FS2PD

No.2 paper sensor

FS3PD

No.3 paper sensor

FSPIND

Saddle inlet sensor

Jam type

Sensor

Jam condition

Code

Inlet delay

FSPIND

The saddle inlet sensor (FSPIND) does not detect paper sheet even if 
predetermined time (distance) has passed after receiving saddle delivery request 
signal from the finisher.

1793

Inlet stationary

FSPIND

The sheet does not move past from the saddle inlet sensor (FSPIND) even if 
predetermined number of sheets have been delivered by the feeder motor (FSFM) 
after the saddle inlet sensor (FSPIND) detects the top edge of sheet.

17A3

Feed delay

FS1PD

The NO.1 paper sensor (FS1PD) does not detect paper sheet even if 
predetermined time (distance) has passed after the saddle inlet sensor (FSPIND) 
detects the top edge of sheet.

1791

Feed stationary

FS1PD, FS2PD, FS3PD

The sheet does not move past from the No.1 paper sensor (FS1PD), No.2 paper 
sensor (FS2PD), and the No.3 paper sensor (FS3PD) even if predetermined 
number of sheets have been delivered by the feed motor (FSFM) after the 
No.1paper sensor (FS1PD) detects the top edge of sheet.

17A1

Delivery delay

FSPDD

The paper sensor (FSPDD) does not detect paper even if predetermined number of 
sheet stacks have been delivered by the paper folding motor (FSFOM) after paper 
is pushed by the paper pushing plate.

1792

Delivery stationary

FSPDD, FSVPPD

The paper stack does not move past from the delivery sensor (FSPDD) even if 
predetermined number of stacks have been delivered by the paper folding motor 
(FSFOM) after the delivery sensor (FSPDD) detects the top edge of sheet. The 
paper stack does not move past from the vertical path paper sensor (FSVPPD) 
even if predetermined number of stacks have been delivered by the paper folding 
motor (FSFOM) after the delivery sensor (FSPDD) detects the stacks.

17A2

Stitcher stapler

FSSHP2, FSSHP1

When the stitcher motor (FSFSTM/FSRSTM) is rotating clockwise, the stitcher 
home position sensor (FSSHP2/FSSHP1) does not turn ON within 0.4 secs after it 
has turned OFF. In addition, the sensor turns ON within 0.4 secs after the motor has 
been rotated counterclockwise.

1786

Power-On

FSPPPD, FSPDD, 
FSVPPD, FS1PD, 
FS2PD, FS3PD, FSPIND

One of the sensors on the paper sensor PCB (No.1 paper sensor (FS1PD), No.2 
paper sensor (FS2PD), No.3 paper sensor (FS3PD), vertical path paper sensor 
(FSVPPD), delivery sensor (FSPDD), paper positioning plate paper sensor 
(FSPPPD), saddle inlet sensor (FSPIND) detects a sheet when power is supplied.

1787

Door open

FSINDD, FFDD

The inlet cover sensor (FSINDD) detects opening of the cover during operation. 
The front cover open/close sensor (FFDD) detects opening of the cover while paper 
is on the stapling tray.

1788

MX-FNX4  OPERATIONAL DESCRIPTION  5 – 27

The finisher judges to be jammed, and sends the jam signal to the host machine when the conditions shown below occur. Then, the host
machine may stop copy operation, as well as displays paper jam sign.

Jam type

Sensor

Jam condition

Code

iRC3100/3170/

2570

iR4570/

3570,2570/

2270

Feed delay

LED5, PTR5

The trailing edge sensor (LED5, PTR5) does not detect paper even if the specified time 
(distance) has passed after delivery signal is received from the host machine.

1002

1012

Feed residence

LED5, PTR5

The sheet does not come through the trailing edge sensor (LED5, PTR5) even if the 
specified time (distance) has passed after the trailing edge sensor (LED, PTR5) 
detects paper.

1102

1122

Punch

FPHPD

The sensor does not turn ON again even if the specified time has passed after the 
punch home position sensor (FPHPD) turns off.

1644

1644

Power ON

LED5, PTR5

The sheet is detected by the trailing edge sensor (LED, 5, PTR5) after power is 
supplied.

1645

1645

MX-FNX4  OPERATIONAL DESCRIPTION  5 – 28

The 24 VDC power line used to drive motors and solenoids is
equipped with a fuse or motor driver having overcurrent protector.

The 24 VDC power supply used for motors and solenoids is
equipped with a circuit breaker (CB1). The 24V power supply used
to drive the guide motor (FSGM), alignment motor (FSJM), and the
paper positioning plate motor (FPPM) is equipped with a fuse
designed to blow when an overcurrent flows.

Front cover close

detection switch (FFDD)

Saddle stitcher

controller PCB

Finisher controller PCB

Host

machine

Motor

Motor

Solenoids

Sensor

Logic

Regulator IC

Regulator IC

(IC28)

(IC7)

Punch controller PCB

(Punch module (optional))

Front cover close

detection switch (FFDD)

Finisher

controller

PCB

Circuit

breaker

(FU3)

Regulator IC

Regulator IC

Logic

Saddle stitcher controller PCB

Inlet door

switch (FSINDSW)

Finisher

control

PCB

Upper door

switch

(FPUDSW)

Front door

switch

(FPFDD)

Punch control PCB

LED PCB