Xerox Phaser 790, Service Manual

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Phaser 790/DocuColor 2006
ADJ 5.1
Initial Issue Repairs and Adjustments
ADJ 5.1 ADF Side Registration
Purpose
The purpose is to adjust the front/rear positioning of documents fed from the ADF onto the
Platen Glass and to check the positioning of images relative to paper.
NOTE: Verify that the Printer Registration Adjustment (ADJ 8.1) on the IOT is within specifica-
tion before performing this adjustment.
Check
1. Using the Copier Setup Test Pattern 82E8220, make two 11x17 (A3) copies with the
machine Color Mode set to Black, magnification set to 100%, and in Platen Mode.
2. Using the second sample copy from step 1 as the document, make a copy from the ADF.
3. Check the copy. Verify that the distance from the side edge to the top of Step 3 on the
SE2 and SE3 scales is 10.0mm
±
3. (Figure 1)
Figure 1 ADF Side Registration Check
Adjustment
1. Adjust by moving the Entrance Tray Assembly to either the front or the rear, as needed.
(Figure 2)
a. If the results are less than nominal, move the tray toward the front.
b. If the results are greater than nominal, move the tray toward the rear.
Figure 2 Adjusting Side Registration
2. Perform the check again, and repeat the adjustment as required.
3. Perform a fine adjustment as follows:
a. Enter Diagnostic Mode (IIT) (GP 19).
b. Enter Systemdata R/W and press the Select button.
c. Enter Chain 715 and Link 7 and confirm the present values.
4. Change the values as required, based on the measurement results. When the measure-
ment is greater than nominal, reduce the value; when the measurement is less than nom-
inal, increase the value. Change the values as follows:
NOTE: To enter a letter hexadecimal value, press the asterisk key prior to entering each letter
value, then press the appropriate numerical key as follows: A=1, B=2, C=3, D=4, E=5,
F=6
a. Enter the new value and press Start.
b. Press the Select button to verify the value has changed.
5. Perform the check again.
10.0mm
±
3
Edge of copy
Paper Feed
Direction
Table 1
Minimum Initial Maximum Remarks
Settings Range 0 47h FFh 0.04mm/Step
1
Loosen the
screws (2)
2
Move the tray
3
Tighten the
screws (2)