Lexmark C750 Service Manual page 441

4.
A color band is visible through the black bars. Locate the center of the color band and determine the value.
•
If all the color bands for Cyan, Magenta, and Yellow on all six groups A through F are centered
between -2 and +2, you are done.
•
If the center is located outside the area between -2 and +2, you need to calculate the appropriate
alignment adjustment for that color. Continue to the next step.
5.
Calculate the Alignment Group values.
Alignment Group
A
B or C
D
E
F
6.
After completing calculations for the colors that are beyond -2 and +2 range, return to the Alignment menu.
See "Electronic color alignment" on page
7.
Select the appropriate color.
8.
Change value of the respective setting by the calculated value.
For example, if T= -5 and dT= 2, the new T value is (T+dT= -5 + 2) -3.
9.
Once all values are changed, return to the Print Tests menu and select Prt Line Len Cal.
10.
Verify that the adjusted values and the color bands for Cyan, Magenta, and Yellow on all six groups, A
through F, are centered between -2 and +2. Repeat if necessary.
Note: The Line Length Calibration must be printed after making any changes to color alignment.
11.
Exit diagnostics.
Adjustment Calculation(s)
dT=(A+B+B-C+D)/3
dT=(A+B+B-C+D)/3
dT=(A+B+B-C+D)/3
dL=(E-F)*6
dL=(E-F)*6
-12.
---
dZ=(B-C)*2
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dR=F*6
Appendix A—Service tips
5060-00x
A-15