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PA02: Feeder Marks
PA02 displays as tracks on the paper that correspond to the measurements of the
sheet feeder’s wheels (2 x 1/2'” wide, roughly 5 in apart).
Cause
This defect results from a dirty feeder assembly, possibly from aerosol or an ink spill
that contacts media.
Solution
The media feeders should be cleaned periodically by vacuuming the dust. Also use a
soft lintfree cloth and some dionized water to clean the rollers of the feeder.
PA03: Starwheel Marks
PA03 presents as small track marks that are visible in printed media. The printer has
little pointy wheels in the upper clamshell that hold the paper down in the paper path.
Starwheel marks are usually only visible on glossy media.
Cause
This defect results when starwheels are exerting too much pressure on paper, are
dirty, or are not moving properly.
Solution
1. Print a solid area fill plot (insert plot here) and look for track marks.
2. Check that all starwheels are present and free to move both rotationally as well
as vertically.
3. Vertical force should be the same on all the starwheels ~10g per.
4. Starwheel points should be sharp and not rounded.
5. Clean the starwheels with water and a soft lint-free cloth to get rid of any ink
debris on the wheels. Continue process until marks on media have stopped.
Paper Feed Inconsistency
In general this relates to periodic or random horizontal bands in the printed image.
PA04: High Frequency Horizontal Banding
PA04 displays as horizontal banding at a frequency higher than one cycle per 1/2
inch, typically about 1mm spacing. The banding occurs all the way down the page, with a
period of 1cm or less and appears as dark or light horizontal bands across the media.
Usually spans the entire width of the media but can vary in degrees of severity across the
page.
Cause
Causes may include: debris on paper path rollers, shafts, pullies, idlers or belt; belt
damage, location and tension; loose pullies and or idlers; loose motor; any interference
or touching of the drive system. It also can be due to non-round or non-centered paper
drive components. Causes can be identified by the location and spacing between
banding. A single defect on the encoder wheel would lead to a horizontal bar about every
inch, and can happen as a result of paper fibers landing on the encoder wheel. Higher
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