Imaging - Xerox VersaLink B7025 Service Manual

Document Size Sensing - Same Size Set
Document Width - Cross Process Direction
The document set width (cross process direction) is detected by the DADF tray set guide sen-
sors 1 - 3 (tray APS sensors, Figure 4) that are activated by the rack gear that moves with the
document edge guides.
Document Length - Process Direction
The document length (in the process direction) is detected by the document tray size sensors 1
and 2, Figure 4.
Refer to Tray APS Sensors and Size Sensors.
Document Size Sensing - Mixed Set
Initial Document Sensing
When a stack of documents of different sizes is set the initial document set size is detected
according to the combination of the maximum width and length of the set, refer to
Sensors and Size Sensors.
Mixed Document Length - Process Direction
Individual document length (process direction) is determined by counting pulses from the feed
motor. The counting begins when the lead edge of the document arrives at the registration sen-
sor. The counting ends when the trail edge of the document leaves the DADF feed out sensor.
A calculation is then made to determine the document length.
Mixed Document Width - Cross Process Direction
Individual page size checking (cross process direction) occurs as the documents feed using
the APS sensors located in the paper path, refer to
monitor the document as it feeds to the pre-registration rolls. The control logic uses the input
from the APS sensors to calculate document width.
Launch Issue
Xerox® VersaLink® B7025/B7030/B7035 Multifunction Printer
Tray APS
APS Sensors. APS sensors 1, 2 and 3
April 2017

Imaging

Image Input Terminal Overview
The scanner in the Image Input Terminal (IIT) uses an LED exposure lamp to illuminate and
scan the document.
NOTE: . The LED exposure lamp is referred to as the lamp assembly in the Parts List, refer to
PL 60.20 Item 9.
The LED exposure lamp is mounted on the full rate carriage and illuminates the document. in
response to signals from the ESS PWB via the FFC LED cable.
The image of the document is reflected by the mirrors on the full and half rate carriages to the
lens assembly. The image is focused by the lens onto the charge-coupled device (CCD). The
CCD array converts the optical information to electrical analog levels that represent the red,
green, and blue components of the original image. The CCD array uses a series of red, green
and blue filters to separate the reflected image data into its R, G, and B components. Refer to
Figure 1.
NOTE: Figure 1 shows the IIT after removal of the lens cover assembly,
Full rate carriage
Half rate carriage
8-19
PL 60.10 Item
Lens assembly
LED exposure lamp
CCD PWB
Figure 1 IIT
Product Technical Overview
12.