Xerox 7700DX - Phaser Color Laser Printer, Service Manual, Page: 142 / 406

3-112 Phaser 7700 Color Laser Printer Service Manual
Streaks Parallel with the Leading Edge
There are dark lines running
parallel with the leading edge of the
print, perpendicular to direction of
paper travel (B-size print shown).
The printer displays no error code.
Note A-size prints are processed
through the printer with the
short edge of the print
parallel to the direction of the
paper path -- making print
artifacts parallel to the long
edge of the print.
B-size prints are processed
through the printer with the
long edge of the print parallel
to the paper path -- making
artifacts parallel to the short
axis of the print.
1. Inspect the paper that is loaded in the paper tray. Is the paper wrinkled,
dimpled, or show any signs of having a high moisture content?
2. Does the band repeat at a specific interval? If so, troubleshoot using the
Repeating Defects topic.
3. Run the Remove Print Smears routine. From the front panel’s Support
Menu, select Improve Print-Quality?, then select Remove Print Smears.
4. If the test prints are all okay, but prints from an application are not, replace
the Image Processor Board (RRP 39, on page 7-202).
Banding
1. Print the Repeating Defects pages.
From the front panel’s Printable Pages
Menu, select Service Pages, then select Print Repeating Defects Pages.
2. Swap the Print Cartridges. If the defect still appears in the same color, the
problem is the developer. If the banding traveled, it is the print cartridge. All
colors is a problem with the Accumulator Belt.
3. Replace the Accumulator Belt Assembly (RRP 35, on page 7-196).
4. If the banding frequency is high (.5 mm), replace the Laser Unit (RRP 38,
on page 7-200).
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Leading Edge
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