Sharp AR-F12 (serv.man6) Service Manual ▷ View online
2-51
CHAPTER 2 FINISHER UNIT BASIC OPERATION
K. Detecting Jams
The following sensors are used to detect the presence/absence of paper and to make sure that
sheets are moved properly:
●
Inlet sensor (PI1)
●
Delivery sensor (PI3)
●
Stapling tray sensor (PI4)
●
Buffer path paper sensor (PI14)
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, the buffer path inlet
paper sensor (PI17) checks whether or not copies are being detected in addition to the above four
sensors (inlet sensor, delivery sensor, stapling tray sensor and buffer path paper sensor). If the sensors
detect a copy when all doors are closed, the finisher unit judges that paper jams have not completely
been removed, and sends the paper jam removal signal to the host machine again.
paper sensor (PI17) checks whether or not copies are being detected in addition to the above four
sensors (inlet sensor, delivery sensor, stapling tray sensor and buffer path paper sensor). If the sensors
detect a copy when all doors are closed, the finisher unit judges that paper jams have not completely
been removed, and sends the paper jam removal signal to the host machine again.
The tray 1 paper sensor (PI11) and tray 2 paper sensor (PI12) are not used to detect jams.
PI1
PI14
PI4
PI3
Figure 2-256
Table 2-205
No.
Sensor names
PI1
Inlet sensor
PI3
Delivery sensor
PI4
Stapling tray sensor
PI14
Buffer path paper sensor
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CHAPTER 2 FINISHER UNIT BASIC OPERATION
1.
Inlet Sensor Delay Jam
The inlet sensor does not detect paper when feeding an equivalent of 400 mm from when the host
machine delivery signal has been issued.
Host machine delivery signal
Host machine delivery signal
Jam check
Equivalent of 400 mm
Inlet sensor (PI1)
Normal
Inlet feed motor (M9)
Jam check
Inlet sensor (PI1)
Inlet feed motor (M9)
Jam
Equivalent of 400 mm
Figure 2-257
2.
Inlet Sensor Stationary Jam
The sheet does not move past the inlet sensor when an equivalent of twice the feeding length of
the sheet has been fed after the sensor turned on.
Jam check
Equivalent of size x 2
Inlet sensor (PI1)
Normal
Inlet feed motor (M9)
Jam check
Equivalent of size x 2
Inlet sensor (PI1)
Jam
Inlet feed motor (M9)
Figure 2-258
3.
Buffer Path Paper Sensor Delay Jam
The buffer inlet sensor does not detect paper when an equivalent of 550 mm has been fed after
the inlet sensor turned on.
Jam check
Equivalent of 550 mm
Equivalent of 550 mm
Inlet sensor (PI1)
Buffer path paper
sensor (PI14)
sensor (PI14)
Normal
First feed motor (M1)
Jam check
Inlet sensor (PI1)
Buffer path paper
sensor (PI14)
sensor (PI14)
First feed motor (M1)
Jam
Figure 2-259
2-53
CHAPTER 2 FINISHER UNIT BASIC OPERATION
4.
Buffer Path Paper Sensor Stationary Jam
The sheet does not move past the buffer inlet sensor when an equivalent of twice the feeding
length of the sheet has been fed after the sensor turned on.
Jam check
Equivalent of size x 2
Buffer path paper
sensor (PI14)
sensor (PI14)
Normal
First feed motor (M1)
Jam check
Equivalent of size x 2
Buffer path paper
sensor (PI14)
sensor (PI14)
Jam
First feed motor (M1)
Figure 2-260
5.
Delivery Sensor Delay Jam
a.
Straight Path
The delivery sensor does not detect paper when an equivalent of 476 mm has been fed after the
inlet sensor turned on.
Jam check
Equivalent of 476 mm
Inlet sensor (PI1)
Normal
Delivery sensor (PI3)
First feed motor (M1)
Second feed motor
(M8)
(M8)
Jam check
Inlet sensor (PI1)
Delivery sensor (PI3)
First feed motor (M1)
Second feed motor
(M8)
(M8)
Equivalent of 476 mm
Jam
Figure 2-261
2-54
CHAPTER 2 FINISHER UNIT BASIC OPERATION
b.
Buffer Path
The delivery sensor does not detect paper when an equivalent of 772 mm has been fed after the
inlet sensor turned on.
Jam check
Equivalent of 772 mm
Equivalent of 772 mm
Inlet sensor (PI1)
Normal
Delivery sensor (PI3)
First feed motor (M1)
Second feed motor
(M8)
(M8)
Jam check
Inlet sensor (PI1)
Delivery sensor (PI3)
First feed motor (M1)
Second feed motor
(M8)
(M8)
Jam
Figure 2-262
6.
Delivery Sensor Stationary Jam
The sheet does not move past the delivery sensor when an equivalent of twice the feeding length
of the sheet has been fed after the delivery sensor turned on.
Jam check
Equivalent of size x 2
Equivalent of size x 2
Delivery sensor (PI3)
Normal
Second feed motor
(M8)
(M8)
Delivery motor (M2)
Jam check
Delivery sensor (PI3)
Second feed motor
(M8)
(M8)
Delivery motor (M2)
Jam
Figure 2-263
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