Xerox 5400N - Phaser B/W Laser Printer, Service Quick Reference Manual

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176 Phaser 5400 Laser Printer Service Guide
Image-Quality Troubleshooting
Introduction
This section contains image-quality repair procedures to assist in correcting
image-quality defects. These procedures provide defect samples, definitions and
specifications to help identify the type of defect that exists, the test pattern to use, and
actions required to correct the defects.
Throughout these procedures, the term “vertical” refers to the process direction (the
direction paper travels through the printer); the term “horizontal” refers to the
scanning direction (the direction the laser beam scans across the page).
Be sure to check the paper tray to determine whether paper is being fed long edge or
short edge first. This determines “vertical” and “horizontal” for paper fed from that
particular tray.
Cleaning procedures should always be performed before beginning any Print-Quality
Repair procedure.
Be sure that the paper meets printer specifications. Changing the paper, or using paper
from a previously unopened ream, will resolve many print-quality issues.
After resolving an image-quality problem, return to Image-Quality Checkout to verify
that no other image-quality defects exist.
Sample reproductions of the various image-quality patterns are included under
Image-Quality Specifications.
Use the Image-Quality RAPS to further diagnose machine problems.
In the Y/N (Yes/No) steps of the RAPs, a “Yes” response will lead you to the next
step. A “No” response will indicate a corrective action, or will direct you to another
step. When the indicated corrective action has been completed, go to Section 1 and
restart the Initial Actions to verify that the problem has been corrected.