Xerox 8830 Service Manual page 417

ADJ 4.4.7 Left to Right Stitch Alignment
Purpose
The 7356 Scanner contains three cameras, each of which captures 1/3 of the full width of the
36 inch (91.4mm) scanned image. The purpose of this procedure is to compensate (or the vari-
ations in the left-to-rlght position of Camera 1 and Camera 3 with respect to Camera 2.
Check
Perform the following:
1. From the Ready to Copy Screen, press the Copy (contrast) Up/Down buttons and the
MENU button simultaneously. The scanner Main Menu will appear.
2. From the Main Menu select Diagnostics > Password and then enter the numeric CSE
password (6789). Return to the Main Menu screen.
3. Select Diagnostics > Scanner Diagnostics > Stitch Alignment > Left To flight.
4. Press the ENTER key. The Left To Right Stitch Alignment screen appears (Figure 1).
Figure 1. Left to Right Stitch Alignment Screen
5. Insert the test target 082E11490 face down on the scanner platen, and allow the test tar-
get to be transported to the starting position. Press the START key to begin the test.
6. Once the START key has been pressed the system software checks the timing of the
sensor actuation end stores new correction values automatically. The word RUNNING will
appear in the tower left corner of the display while this check is in progress. The system
displays PASSED if the adjustment was successful; otherwise, FAILED is displayed. If
FAILED is displayed, refer to the 7366 Scanner Service Manual, Section 2, Repair Analy-
sis Procedures.
8830 DDS
7. When this test has been completed, press the EXIT key during one of the one-second
intervals when the motor stops between measurements, then remove the test target man-
ually by pulling the test target toward the front of the scanner until It has cleared the Drive
Rollers.
NOTE: Do not use the rocker switch to position or remove the test target at any time dur-
ing this procedure.
NOTE: Do not exit back to the Ready Screen with the test target still inserted in the scan-
ner.
8. It a test reports "FAILED: BAD TARGET' the scanner will be reset after the EXIT key has
been pressed. It will be necessary to wait for the scanner to finish the Power On Self Test
before the test can be executed again.
Adjustment
Adjustment occurs automatically.
NOTE: The left-right stitch adjustment is made by changing the range of active elements in the
camera Charge-Coupled Device (CCD) arrays until there is no overlap or gap in the three
Images. If the available range of elements is not sufficient to achieve a correct alignment, the
message 'Camera X could not be aligned' Is displayed. Mechanical alignment of the camera
cannot be done in the field. Contact technical operations to arrange tor an exchange of the
Scanner.
0800011A-WHO
3/98
4-13
Repairs/Adjustments
ADJ 4.4.7