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Xerox 490/980 Color Continuous Feed Printing System Maintenance
Printer Operator Guide 3-17
Adjusting Print Quality
This section describes print quality problems and how to solve them. If the print quality is not
good, follow the steps described below.
If the problem persists after the steps are performed, please contact the customer support
center.
For information about calibration in the Color mode, refer to the Color Management Guide.
Scumming
Scumming is the phenomenon in which toner dust remains entirely or partially on the printed
surface. If scumming occurs in black and white mode, perform the procedure below to solve the
problem.
1. Make sure all doors and covers on the machine are closed.
2. Select [Printer Management] on the touch screen, then select the [Dens/Pos Adjust] tab.
3. Select the [B/W] tab.
4. Select the [(-)] button to lower the print density level.
5. Print about 30 or 40 test pages.
6. Lower the density level until there occurs no scumming.
a. For more information on covers and doors on the machine, refer to Chapter 1.
b. For more information on changing the density level, refer to the section on Adjusting
Print Density.
Print Image Partially Missing
If the print image is partially missing (curved or straight white stripes appear), perform the
procedure below to solve the problem.
1. Make sure the paper is correctly loaded.
2. If the paper is damp, replace with new paper.
Uneven print density
If print density is uneven in black and white mode, perform the procedure below to solve the
problem.
1. Make sure the paper is correctly loaded.
2. Select [Printer Management] on the touch screen, then select the [Dens/Pos Adjust] tab.
3. Select the [B/W] tab.
4. Select the [(+)] button to raise the print density level.
5. Print about 30 or 40 test pages.
6. Raise the density level until the print quality is improved.
a. For more information on loading paper, refer to Chapter 2.
b. For more information on changing the density level, refer to the section on adjusting
print density in this chapter.