Oki MC-860 / CX2633MFP, Руководство по обслуживанию и устранению неисправностей

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Chapter 3 Troubleshooting Print Quality
3.1 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 troubleshoot print-quality problems, eliminate as many variables as possible.
The first step is to generate prints using printable pages embedded in the printer on paper
from the Supported Media List. Use paper from a fresh, unopened ream that is acclimated
to room temperature and humidity. If the print-quality defect is still present when printing
on approved media, then investigate software applications and environmental conditions.
The printers use separate Imaging Units to develop a latent image for each color where
the colors are combined on the Transfer Unit to form the final image. In most cases,
print-quality defects are the result of one particular component in the print engine,
See
the Repeating Defects chart
. When a single component of the Imaging Unit is causing a
print quality defect, replace the Imaging Unit.
When analyzing a print-quality defect, first determine if the defect occurs in all colors or
only one color and if it is repeating or random. Continuous defects in the
process
direction
, such as voids and lines, are the most difficult to diagnose. Inspect the visible
surfaces of all rollers for obvious defects. If no defects are observed, replace the Imaging
Units, Transfer Unit, and Fuser one at a time until the defect is eliminated.
Defects Associated with Specific Printer Components
Some print-quality problems can be associated with specific assemblies, the most
common problems and the associated assemblies are listed below. Also, refer to the
printer’s Troubleshooting Print-Quality Problems pages or a specific print-quality
troubleshooting procedure for more information.
Imaging Unit
•
Streaks in Process Direction (in the direction of feed, parallel with paper travel)
•
Banding in Scan Direction (across the page, perpendicular to paper travel)
•
Uneven Density
•
Voids
•
Repeating Defects
•
Mis-registration
Transfer Unit
•
Toner on the back side of the printed page (simplex mode)
•
Light Prints
•
Repeating Defects
•
Mis-registration - only when there is obvious damage to the belt.
Fuser
•
Hot or Cold Offsetting
•
Repeating Defects
•
Dark Streaks in Process Direction
LED Head
•
Streaks in the Process Direction
•
Uneven Density in the Scan Direction
Test Prints
A variety of test prints are available to aid in determining the quality of output from the
printer and to assist in troubleshooting. See sections 2.7.3 and 2.7.5 for details.