Xerox DocuColor 12/DCCS50, Service Manual

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1/05
3-8 DocuColor 12/DCCS50
Reissue
Image Quality
Specification - Highlight : Color Test Pattern; the 10% patches should be visible and the 5%
patches should be barely visible or not visible on the test pattern copy (except for the bottom
row).
Description - Line : The inability to adequately reproduce a text that has low line density.
Specification - Line : Using Test Pattern 82E8220, the copier should reproduce all of the text in
the block.
Description - Low Density : A condition that results when too little toner of a single color or
combination of colors is developed on the copy or print. This results in lighter copies or prints
for the single-color toner or the color that results from the combination of color toners.
Description - High Density : A condition that results when too much toner of a single color or
combination of colors is developed on the copy or print. This results in darker copies or prints
for the single color toner or the color that results from the combination of colors.
Description - Uneven Density : The uneven development of toner on the copy or print from one
area to another. Typically, this results in change in density from front to rear and sometimes
from lead edge to trail edge.
Specification - Uneven Density : The density of both the low density and high density bands
(located near the lead edge of the Color Test Pattern) should be uniform from front to rear.
Fuser Oil Streaks
Description - Process direction streaks that show up first on transparencies or coated paper
as low gloss streaks in solid areas. In severe cases, Oil Streaks can show up on paper as low
density streaks in large half tone areas.
Graininess
Description - An image defect that causes solid areas to have a sandy appearance. Graini-
ness is most noticeable in middle density solid areas.
Hollow Characters
Description - Small circular-shaped deletions within a character that can occur when the
image density is low or a transparency is used.
Line, Single White (Process Direction)
Description - A narrow white line that runs from lead edge to trail edge across the entire copy.
Low Contrast Reproduction
Description - The inability to adequately reproduce a low contrast image.
Specification - Using Test Pattern 82E8220, the copier should reproduce all of the text in the
0.2 G paragraphs.
Misregistration (Color-to-Color)
Description - Multi-colored images that are not superimposed and should be. This can occur
in the process direction or perpendicular to process direction.
Misregistration (System)
Description - The alignment of the image to the edges of the copy paper. It is defined by lead
and side edge registration, and lead and side edge skew.
Specification
• Lead Edge Registration: +1.6 mm (Trays 1 - 4), +2.2 mm (Tray 5)
• Side Edge Registration: +2.1 mm (Trays 1 - 4), +3.0 mm (Tray 5)
• Lead Edge Skew: +1.6 mm (Trays 1 - 4), +2.0 mm (Tray 5)
• Side Edge Skew: +2.4 mm (Trays 1 - 4), +3.0 mm (Tray 5)
Missing Color(s)
Description - The loss of one or more of the color toners from the output copy or print.
Depending on the original, this can result in missing areas of the image, or changes in the color
balance of the copy or print.
Moire
Description - Patterns on the image areas of the output copy or print that have the appear-
ance of a screen or grid overlaying the image. It may be uniform or nonuniform in area or
shape.
Mottle
Description - Solid area, high density image areas that are reproduced with a surface that
resembles marble.
Newton Rings
Description - Repetitive, irregular-shaped marks that occur when making copies of glossy
photographs. These marks are most noticeable in large low-density or highlight areas.
Offsetting, Fuser
Description - The removal of toner from the copy by the fuser and the subsequent redeposi-
tion of that toner on another area of the same or other another copy. Removing toner from the
image leaves the image rough and without gloss. The redeposited toner may appear as a
duplicate image, partially shifted image, or lines and streaks.
Residual Image
Description - A toner image that remains on the photoreceptor or IBT after cleaning. The next
image is place on top of the residual image and both images are transferred to the next copy.
ROS Borders
Description - Intentional lead edge, side edges, and trail edge deletions that make a border on
the copy paper.
Specification
• Lead Edge: 5 mm +1.0 mm (All Trays)
• Side Edges: 3 mm +1.0 mm (All Trays)
• Trail Edge: 3 mm +1.0 mm (All Trays)
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