Sharp AR-F11 (serv.man3) Service Manual ▷ View online
2-48
CHAPTER 2 FINISHER UNIT BASIC OPERATION
5) The buffer roller continues to rotate, and the second sheet overlaps the first sheet.
First sheet
Second sheet
Figure 2-251
6) When the trailing edge of the second sheet has moved past the buffer path paper sensor (PI14),
the buffer roller stops and waits for the third sheet.
First sheet
Second sheet
Third sheet
Buffer path paper
sensor (PI14)
sensor (PI14)
Figure 2-252
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CHAPTER 2 FINISHER UNIT BASIC OPERATION
7) When the third sheet arrives and its leading edge reaches the inlet sensor (PI1), the buffer roller
starts to operate once again.
First sheet
Second sheet
Third sheet
Inlet sensor (PI1)
Figure 2-253
8) When the leading edge of the third sheet reaches the inlet sensor (PI1), the buffer outlet solenoid
(SL3) turns off so that the path is directed in the direction of delivery. (The actual switch-over
will occur after the trailing edge of the first sheet has moved past the flapper.)
will occur after the trailing edge of the first sheet has moved past the flapper.)
OFF
SL3
Buffer outlet
solenoid
solenoid
First sheet
Second sheet
Third sheet
Inlet sensor (PI1)
Figure 2-254
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CHAPTER 2 FINISHER UNIT BASIC OPERATION
9) The buffer roller continues to rotate, the third sheet overlaps the first and second sheets, and the
three sheets are fed together towards the delivery roller.
Figure 2-255
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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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