April 2017
8-44
Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
Launch Issue
Product Technical Overview
Registration Roll and Sensor
The registration sensor detects the paper just prior to the registration nip rolls. Its signal, in con-
junction with the registration clutch on signal, indicates media jams, i.e., if the registration
clutch on signal has occurred and the sensor fails to stay on a specified time, a jam down
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stream from the sensor or in the duplex path is indicated and the paper path transport system
will shut down. The control logic also uses the signal from the registration sensor (registration
sensor off) in the control of duplex transport operations, bypass feed start timing, and tray 1
feed start timing, Figure 9.
The idlers for the registration roll, PL 80.55 Item 8, are located in the LH cover assembly, PL
80.45 Item 1, and with the registration roll form the registration nip. The registration roll is
driven by the main motor via a gear train and registration clutch, PL 80.55 Item 11. As the reg
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istration roll receives the paper that has been fed from the paper trays a buckle is formed in
each sheet as it reaches the registration nip to remove any skew. At this point there is a small
delay for sheet scheduling. After this time has expired, the registration clutch is energized and
the main motor and registration roll are run to transport the sheet between the BTR roll and the
photoreceptor in the xerographic transfer area. As the sheet passes the drum of the photo
receptor the toner image is transferred to the paper, refer to Figure 8 and Figure 9.
Figure 9 Paper registration
Duplex Transport
The duplex paper path reverses the direction of travel, enabling side 2 printing. The duplex
rolls are driven by the drum motor via a gear train and clutch, Figure 8 and Fusing/Copy Trans
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portation.
High Capacity Feeder: Paper Feed
Refer to Figure 10.
• The HCF feed/lift motor switches on in a clockwise direction, rotating the nudger roll and
feed rolls.
• The top sheet feeds into the nip of the feed roll and retard roll, actuating the HCF pre feed
sensor; this turns on the takeaway motor.
• Paper continues to advance, actuating the HCF feed out sensor.
• The takeaway motor rotates the takeaway rolls, transporting the sheet to the takeaway
rolls in the IOT's takeaway (vertical) transport.
• When the trail edge of the paper clears the HCF feed out sensor, a timed interval begins
after which the takeaway motor switches off.
• As paper continues to feed from the paper stack, the HCF level sensor will de actuate,
causing a lift cycle. The HCF lift/feed motor will switch off to stop feeding, then begin rotat
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ing counter clockwise to lift the paper stack, then the feed cycle will then begin again.
Figure 10 Paper feed
HCF pre feed sensor
HCF feed ou
sensor
Takeaway motor
Feed roll
Retard roll Takeaway rolls
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