Xerox Phaser 8560MFP Service Documentation page 277

Scanner Assembly Functions
Scanner Assembly Components
Document Glass The scanner platen is used for copying or scanning original documents
or Platen and images. The platen functions well for media outside the operating
range of the DADF (16 lb.-32 lb.), fragile or damaged originals, photo-
graphs, or large (or bound) items such as books or periodicals.
Scanhead and The Flatbed portion of the IIT contains a moveable scanhead that
Lamp includes the CCD imaging board, main control board, drive motor, and
lamp assembly. The lamps are Cold Cathode Fluorescent Lamps (same
as the lamps in the DADF).
CVT Window This portion of the platen is a part of the DADF media path. The principal
function of this window is to allow the lower scanhead to image the first
side of an original being fed through the DADF.
IIT Connector An electrical connection on the rear of the Flatbed portion of the IIT con-
nects to a receptacle on the IOT completing the signal path for image
data from the IIT, power to the IIT, and system communications between
the three components.
Control Panel The Control Panel is the user interface with the system.
Scanner and Document Feeder Calibration
Automatic Calibration
The automatic calibration performed by the system is a "white balance" calibration performed
during startup and at pre-programmed intervals of operation. This calibration ensures that the
system detects the response to a given calibration spot and determines the effects of lamp
temperature and age on the image quality of the system.
Automatic calibration uses built in targets. The target for the flatbed is on the back of the
diverter strip; the target for the DADF is located on the back of a moveable flap, internal to the
DADF. The calibration is automatic at power-up, when coming out of energy star mode, and at
a predetermined schedule based on the length of time the lamps have been on continuously.
Automatic DADF Calibration
Calibration for the DADF is performed at initial power-up and "as required" with normal usage
of the DADF. The steps are the same for both conditions.
1. The lamps turn on.
2. The calibration strip moves back slightly from the home position, to confirm the home
position, then extends into the image path.
3. The calibration strip holds this position until the Charge Coupled Device (CCD) image
reaches a specified luminescence value and is stable.This time varies depending on the
starting conditions of the lamp.
4. Once the color stabilizes, the strip retracts back to its home position.
Initial Issue
Phaser 8510/8560MFP Multifunction Product
Figure 2 DADF Calibration Strip
Automatic Scanner Calibration
1. Lamps turn on.
2. The scanhead drives toward the automatic calibration target to ensure that the head lock
is released.
3. Scanhead moves back to the home position flag, out, and back in to confirm operation.
4. Scanhead moves under the calibration target until the CCD achieves a predetermined
image quality and stability.
5. Scanhead moves toward platen glass to confirm motion control.
6. Scanhead moves back to the home position under the CVT window.
Manual Calibration
Manual calibration is a maintenance procedure accessed through the Control Panel. Scanner
calibration requires the calibration sheet provided with a replacement Scanner Assembly. It is
designed to ensure the DADF and scan heads are aligned to the system (motion control), the
scan heads are aligned to one another (duplex scanning alignment), and that certain white,
black and gray scale calibrations are performed. This calibration is performed:
• At the factory during initial system setup.
• Whenever the document feeder or scanner assembly, or both, are replaced.
• If troubleshooting determines that the calibration has drifted or that the calibration data
has been erased from the system (ESD event).
NOTE: The manual calibration procedure is detailed in ADJ 1.15.1.
10/2006
8-5
Theory of Operation
Image Input Terminal