Xerox 8830 Service Manual page 416

ADJ 4.4.6 Front to Back Stitch Alignment
P u r p o s e
The purpose of this adjustment is to compensate for the variations in the Front-to-Back 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 > Front to Back.
4. Press the ENTER key. The Front To Back Stitch Alignment screen appears (Figure 1).
Figura 1. Front to Back 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 button has been pressed the system software begins measuring the
Front To Back Camera Alignment at the rate of once per second. The word RUNNING will
appear in the lower left corner of the display. The cameras are correctly aligned when the
last numbers in the above expressions are set to zero. For example:
if the readings from the 8830 DOS Control Panel do not match the ratios Indicated above,
the Front to Back Stitch Alignment will have to be adjusted.
repairs/adjustments
ADJ 4.4.6
Camera 1 - 2:0
Camera 2 - 3:0
NOTE: The Gap value may vary slightly with each scan, but the average reading should
be zero.
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 teat 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. If a test reports TAILED: 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
1, (Figure 2): Remove the Access Covers and adjust the alignment of the cameras.
B
Twist the Camera Adjustment Screws (located behind the cover plates)
while reading the respective camera alignment ratios displayed on the
Control Panel. When the correct ratio has been reached for both cameras,
replace the Access Covers.
060001JA.WHO
Figure 2 Removal of Access Covers for Camera Alignment
3/80
4-12
Loosen the captive
screws and remove the
Access Covers.
0700005A-WHG
8030 DOS