Xerox VersaLink B7025 Service Manual page 1286

Overview: Paper Path Sensors
The control logic uses the signals from the paper path sensors to control the on and off timing
of the drive components and to detect jams and misfeeds.
Misfeeds typically indicate that a feed out sensor or a pre feed sensor fails to turn on within the
specified time.
Misfeed Examples
• Fault 073-101 tray 3 miss-feed occurs when the tray 3 feed out sensor does not turn on a
specified time after the tray 3 feed start signal.
• Fault 072-100 tray 2 pre miss-feed occurs when the tray 2 pre-feed sensor fails to turn
ON within a specified time from tray 2 feed start.
Jams typically indicate that a sensor's signal remains on too long or fails to turn on at all.
Jam Examples
• Fault 072-105 registration sensor jam (tray 2) indicates that registration sensor failed to
turn ON in a specified amount of time after the registration clutch initialized during paper
feeding from tray 2.
• Fault 077-902 exit 2 sensor jam indicates that paper remains at exit 2 sensor while the
machine is powered on and stopped and has its interlocks closed.
NOTE: The following describes typical functions performed by various paper path sensors; it is
not an exhaustive list.
Refer to Figure 1.
• Tray 1 pre feed sensor - provide misfeed and jam detection for trays 1.
• Tray 2 feed out sensor- this sensor detects the lead and trail edges of sheets fed from tray
2 as they pass the takeaway roll; also used for tray 2 misfeed and jam detection.
• Bypass no paper sensor - The bypass no paper sensor detects paper presence in the
bypass tray.
• Registration sensor - monitors the registration unit for the presence of paper. Its signal, in
conjunction with the registration clutch on signal, indicates media jams, i.e., if the registra-
tion clutch on signal has occurred and the sensor fails to stay on a specified time, a jam
downstream from the sensor or in the duplex path is indicated. 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.
• Duplex sensor - The duplex sensor monitors the duplex path. A duplex path sensor on
jam occurs when the sensor fails to turn on a specified time after the exit 2 motor reverses
rotation to feed the sheet into the duplex area. A jam in the duplex area may be indicated
by the sensor remaining on.
Product Technical Overview
Takeaway Rolls and Drive
Each individual paper tray with the exception of tray 4 on the TTM has an associated takeaway
roll that takes over transportation of media fed via the paper feeder and then drives that media
along the paper path towards the registration nip rolls. The transportation of paper feed from
tray 4 on the TTM is continued via the tray 4 transport assembly,
The drive for the takeaway rolls is provided by the take away motor of the associated paper
tray, with the exception of paper tray 1. The drive for the tray 1 takeaway roll is provided by the
main drive motor, Figure 2.
Figure 2 Tray 1 Takeaway and registration roll drive
The gear train linkage from each of the takeaway motors to the takeaway rolls varies for each
paper supply modules. Refer to the following section for details on post feed paper transporta-
tion to registration nip rolls:
• Paper Transport from Tray 1
• Paper Transport from Tray 2, Tray 3 and Tray 4 of the 3TM
• Paper Transport from the TTM
April 2017
8-40 Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
PL 80.70 Item 11.
Launch Issue