MX-FN27. Service Manual for N Version - Sharp Copying Equipment Service Manual (repair manual). Page 43

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MX-FN27 N, MX-PN14  OPERATIONAL DESCRIPTION  6 – 17
6. Jam Detection
A. Outline
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.
Jam type
Sensor
A jam is detected when
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
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