Xerox 7700DX Service Manual - Page 142
Streaks Parallel with the Leading Edge, Banding
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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. Leading Edge 3041-43 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 3041-44 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). 3-112 Phaser 7700 Color Laser Printer Service Manual
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