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MX-FN27, MX-PN14  OPERATIONAL DESCRIPTION  6 – 15

The paper retainer holds down the paper stack in the delivery tray to prevent the stack from moving when the leading edge of the next paper is deliv-
ered to the delivery tray.

The paper retainer's home position is detected by the Paper hold home position sensor (FNPS8).

The Paddle motor (FNM10) drives the paper retainer to hold down the paper stack.

The paper delivered from the processing tray by the assist guide is then stacked on the stack tray.

The stack tray is moved up and down by the Tray shift motor (FNM6).

Before start of printing, the Tray shift motor (FNM6) is driven to move the stack tray up/down to the position where the Stack tray paper height sensor
(FNPS9) detects the stack tray top surface.

After paper is delivered from the processing tray, the stack tray moves down by the specified amount. Next, the stack tray is moved up until the Stack
tray paper height sensor (FNPS9) detects the stack tray top surface (top surface of the stacked paper).

The lower limit of the stack tray is detected by the Stack tray lower limit sensor (FNPS10).

FNM10 

Paper Retainer 

Paper hold 

home position sensor (FNPS8)

FNM6 

Stack Tray 

Stack tray lower limit sensor 

(FNPS10)

Stack tray 

paper height sensor (FNPS9)

MX-FN27, MX-PN14  OPERATIONAL DESCRIPTION  6 – 16

The height of the paper stack on the stack tray is detected by the Stack tray paper height sensor (FNPS9). After paper has been delivered to the stack
tray, the stack tray moves down by the specified amount.

Next, the stack tray moves up until the Stack tray paper height sensor (FNPS9) turns on (the top surface of the paper on the stack tray is
detected).The tray is moved down once again and stopped where the stack tray paper height sensor (PS9) turns off.

The above operations are repeated each time paper is delivered to the stack tray to detect the paper height.

However, there are situations in which paper height detection is not performed depending on the print conditions.

The stack tray paper full state is detected by the Stack tray paper height sensor (FNPS9) and Stack tray lower limit sensor (FNPS10).

The stack tray paper full state is detected in the following conditions.

– At power ON, if both the Stack tray paper height sensor (FNPS9) and Stack tray lower limit sensor (FNPS10) are on.

– When the stack tray moves down by the specified amount after paper is delivered to the stack tray, the Stack tray lower limit sensor (FNPS10) turns

on.

– When a stack height higher than the height equivalent to 500 small-size sheets is detected.

– When the internal counter*1 detects that 30 or more copies of stapled or staple-free stapled paper stacks have been delivered.

– When the internal counter*1 detects that 250 or more large-size sheets have been delivered.

– When the internal counter*1 detects that 250 or more sheets that include a mixture of small-size and large-size sheets have been delivered.

– When the internal counter*1 detects that 10 envelops have been delivered continuously.

– When the internal counter*1 detects that 20 postcards have been delivered continuously.

– When the internal counter*1 detects that 20 Tab papers, OHPs or Labels  have been delivered continuously.

 *1 : The internal counter's sheet count and copy count are cleared in the following situations.*1

– When the paper stack on the stack tray is removed.

– When the power is turned off and then back on.

Stack tray paper height sensor (FNPS9)

  

Stack tray paper height sensor (FNPS9)

Stack tray lower limit sensor (FNPS10)

ON 

MX-FN27, MX-PN14  OPERATIONAL DESCRIPTION  6 – 17

The finisher is equipped with the following paper detection sensor to check whether paper is present and whether the stapler is operating normally.

Further, it is equipped with the following switch to detect the open or closed state of the front cover.

– Delivery sensor (FNPS1)

– Front cover switch (FNMSW1)

Occurrence of a jam is checked (at the check timing) according to the sensor and switch detection states stored in the CPU (IC1) on the finisher con-
troller PCB.

When the finisher controller PCB judges that a jam has occurred, it stops feeding/delivering paper and notifies occurrence of the jam to the host
machine.

Delivery sensor delay jam

FNPS1

The Delivery sensor (FNPS1) does not detect paper even when the specified time has elapsed after receiving a 
paper reception notification signal from the host machine.

Delivery sensor stationary jam

FNPS1

The delivery sensor does not turn off even when the specified time has elapsed after the Delivery sensor 
(FNPS1) detects paper.

Early timing jam

 -

The next paper reception notification signal is detected earlier than the specified time after the previous paper 
reception notification signal is received from the host machine.

Power-on jam

FNPS1

The Delivery sensor (FNPS1) detects paper during power-on or after recovering from sleep mode.

Door open jam

FNMSW1

The Front cover switch (FNMSW1) detects that the front cover has been opened during operation.

Stapler staple jam

 -

The ECO Staple HP Sensor cannot detect the stapler even after the specified time has lapsed since the stapler 
passed through the ECO Staple HP Sensor when stapling is executed.

Warm-up rotation jam

FNPS1

The Delivery sensor (FNPS1) detects paper during warm-up rotation.

Staple-free staple jam

 -

ECO Staple Motor Detection Sensor error:
The Clinch motor drive detection sensor (FNPS13) cannot detect clock pulses even after the Clinch motor 
(FNM9) is driven for a given time.
Clinch HP sensor error:
The Clinch home position sensor (FNPS15) does not turn on even after the Clinch motor (FNM9) is driven for 
0.25 seconds.
Clinch motor error:
The Clinch motor drive detection sensor (FNPS13) cannot detect clock pulses even after the clinch motor (M9) is 
driven for 0.24 to 0.25 seconds.And, the Clinch home position sensor (FNPS15) does not turn on even after the 
clinch motor (M9) is driven for 0.25 seconds.
Staple operation timeout error:
The Clinch motor drive detection sensor (FNPS13) cannot detect the reduction in revolution within 2 seconds of 
starting the Clinch motor (FNM9) operation.
Post-staple-processing operation timeout error:
The clinch HP sensor (PS15) does not turn off even when
4 seconds have elapsed after the Clinch motor (FNM9) starts running.

Error avoidance jam

 -

Any of the following errors is detected during feeding operation.
Assist motor error (E514) Paddle motor error (E516)
Rear alignment motor error (E530) Stapler shift motor error (E532) Return belt motor error (E535) Front 
alignment motor error (E537) Tray shift motor error (E540) Paddle motor error (E577)

Paper feed cancellation jam

 -

The finisher receives a paper feed cancellation instruction from the host machine for paper delivered according to 
a paper reception notification signal.

Manual stack insertion jam

 -

A paper stack is inserted in the manual staple slit while the stapler unit is moving. This is not detected when the 
stapler unit is moving to the staple replacement position.

Operation preparation/ completion 
response timeout jam

 -

A start response cannot be returned within 60 seconds of receiving a start request signal.
An operation completion response cannot be returned within 60 seconds of receiving an operation completion 
request signal.

FNPS1 

FNMSW1

MX-FN27, MX-PN14  OPERATIONAL DESCRIPTION  6 – 18

When the host machine is turned on, it supplies the finisher controller PWB with 24 VDC and 5 VDC. The 24 VDC power is used to drive the motors
and the switches, while the 5 VDC power is for the sensors and the like.

The finisher controller PWB is provided with fuses (FU1 through 4) which blow in response to overcurrent.

FNM 

Stapler motor

Stack Tray  

Paper Height Sensor 

Sensors 

FNPS1 to FNPS8,  

FNPS10 to FNPS16 

Finisher controller PWB (PWB1)

CPU(IC1) 

Host 

machine 

Front Cover Switch

F1 

5VDC 

+3.3VDC 

24VDC 

+3.3V 

generation 

circuit 

Motors 

FNM1 to FNM7,  

FNM9 to FNM10 

F3 

F2 

SW1

FNSTPLIF

FNPS9 

FU4

Rear paper 

flap solenoid

FNSL