Print-Quality Problems Overview - Xerox ColorQube 8570 Service Manual

Print-Quality Problems Overview

Print-quality defects can be attributed to printer components, consumables, media, internal
software, external software applications, and environmental conditions. To successfully trou-
bleshoot print-quality problems, as many variables as possible must be eliminated. The first
step to generate prints using printable pages embedded in the printer on paper from the Rec-
ommended Media List (RML). Print the Paper Tips Page for a list of supported media. The
paper should be from an unopened ream that has been acclimated to room temperature.
Print-Quality Defect Definitions and Procedure
After determining the source of the image quality problem, examine the image and select the
relevant corrective procedure from Table
Table 1 Print-Quality Definitions
RAP Defect
IQ1 Image Quality Entry RAP
IQ2 Random Light Stripes
IQ3 Predominant Light Stripes,
Scratches or Marks Down the
Print or Parallel to the Long Axis
of Printing
IQ4 Streaks, Smudges, or Smears
Down the Print
IQ5 Partial Image/ Color Missing
IQ6 The Printed Image is too Light or
Dark
IQ7 No Image is Printed
IQ8 Color is Uneven or Wrong (Uni-
formity)
IQ9 Skew
IQ10 Ink on White Portion of the
Printed Page
IQ11 Fuzzy or Blurry Printing
IQ12 Vertical Lines Appear Wavy
IQ13 Ghosting
IQ14 Oil on Print
IQ15 Incomplete Image Transfer,
Drop Out, Loss of Image Pixels
IQ16 Repeating Print Defects
IQ17 White Stripes (Pinstripes)
IQ18 Media Wrinkling or Damage
Xerox Internal Use Only - Revised, 3rd Revision
ColorQube 8570/8870 Service Manual
1.
Description
General RAP information.
There is one or more color bars are missing on
the page.
Color bars of all 4 colors are missing on the page.
Ink displaced in the process direction. Variation in
gloss seen as a line in the process direction.
All of the image does not transfer to the paper.
The overall image density is too light or too dark.
The entire image area is blank.
How dark or light a single color appears in multiple
areas.
The printed image is not parallel with both sides of
the paper.
Color on a print where no color should be printed is
often called a latent image.
The image or text appears blurry on the page.
The printed image has wavy column line in the
direction of the paper travel.
Latent image
Oil stains the edge of the print.
Portion of image is not transferred from the Drum to
page.
Image defect occurring at regular intervals.
This print-quality problem has a series of regularly
spaced white stripes approximately 0.7 mm (0.03
in.) apart.
Areas of prints have distinctive "worm track" pat-
terns, and/or wrinkles in the paper itself
RAP Defect
IQ19 Image is Offset or Cutoff
IQ20 Poor Ink Adhesion, Poor Image
Durability
IQ21 Gloss Irregularities
IQ22 Grainy
Table 2 provides definitions of various defects that are not referenced in IQ1 - IQ22 RAPs.
Table 2 General Print-Quality Definitions
Defect
Banding
Blocking
Cohesion
Contamination
Damage
Freckles
Ink Discoloration
Intensity
Offset
Pixel
Process Defect
Roller Mark
Spot
Stripper Blade Marks
Void
October 2012
3-3
Table 1 Print-Quality Definitions
Description
Image is not centered on the page.
The overall image density is too light in all colors.
Variations in the glossiness of the printed image.
Speckled or sand-like appearance in what is meant
to be a smooth area.
Description
Image irregularities in the cross process direction.
Ink transfer from an adjacent print in the stack.
Image transfer to media (transfix quality).
Ink or other debris easily wiped from image or component.
The media is cut, wrinkled, or folded.
Pixels not removed from the drum deposited on later prints.
Color shift due to the ink remaining molten but unused in the
delivery path for long periods of time or different ink colors
mixing.
How dark or light a color appears (saturation).
Ink deposited on incorrect area of print.
Single image pixel of ink.
Media or image irregularity from media transport.
Variation in gloss seen as a line in the process direction.
One or more random spots transfixed to the media.
Line in the cross process direction from the stripper blade.
Area of image without ink.
Print-Quality Problems Overview
Image Quality