Sharp MX-RB15 (serv.man11) 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 Finisher Buffer paper pass
detector (FBPPD), the buffer roller stops and waits for the third sheet.
First sheet
Second sheet
Third sheet
Finisher Buffer paper pass
detector (FBPPD)
detector (FBPPD)
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 Finisher paper enter detector
(FPED), the buffer roller starts to operate once again.
First sheet
Second sheet
Third sheet
Finisher paper enter
detector (FPED)
detector (FPED)
Figure 2-253
8) When the leading edge of the third sheet reaches the Finisher paper enter detector (FPED), the
Finisher Buffer Solenoid 2 (FBS2) 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.)
delivery. (The actual switch-over will occur after the trailing edge of the first sheet has moved
past the flapper.)
OFF
FBS2
Finisher Buffer
Solenoid 2
Solenoid 2
First sheet
Second sheet
Third sheet
Finisher paper enter
detector (FPED)
detector (FPED)
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:
●
Finisher paper enter detector (FPED)
●
Finisher paper pass detector (FPPD)
●
Finisher Paper Alignment Tray Paper Detector (FATPD)
●
Finisher Buffer paper pass detector (FBPPD)
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 Finisher
Buffer paper enter detector (FBPED) checks whether or not copies are being detected in addition to
the above four sensors (Finisher paper enter detector, Finisher paper pass detector, Finisher Paper
Alignment Tray Paper Detector and Finisher Buffer paper pass detector). 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.
Buffer paper enter detector (FBPED) checks whether or not copies are being detected in addition to
the above four sensors (Finisher paper enter detector, Finisher paper pass detector, Finisher Paper
Alignment Tray Paper Detector and Finisher Buffer paper pass detector). 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 Finisher Paper Delivery Upper Tray Paper Detector (FDTPD1) and the Finisher Paper
Delivery Lower Tray Paper Detector (FDTPD2) are not used to detect jams.
FPED
FBPPD
FATPD
FPPD
No.
Sensor names
FPED Finisher paper enter detector
FPPD
Finisher paper pass detector
FATPD Finisher Paper Alignment Tray Paper Detector
FBPPD Finisher Buffer paper pass detector
Figure 2-256
Table 2-205
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