HP LaserJet Enterprise MFP M430, M431 User Guide

Table 9-12 Streak defects (continued)
Sample Description Possible solutions
Dark vertical lines which occur down the
length of the page. The defect might occur
anywhere on the page, in areas of ll or in
sections with no printed content.
1. Reprint the document.
2. Remove the cartridge, and then shake
it to redistribute the toner. Reinsert
the toner cartridges into the printer
and close the cover. For a graphical
representation of this procedure, see
Replace the toner cartridges.
3. Print a cleaning page.
4. Check the toner level in the cartridge.
5. If the issue persists, go to
support.hp.com.
Improve copy image quality
If the printer is having copy quality problems, try the following solutions in the order presented to resolve the
issue.
Try these few simple steps rst:
● Use the atbed scanner rather than the document feeder.
● Use high-quality originals.
● When using the document feeder, load the original document into the feeder correctly, using the paper
guides, to avoid unclear or skewed images.
If the problem still exists, try these additional solutions. If they do not x the problem, see “Improve print quality”
for further solutions.
Check the scanner glass for dirt and smudges
Learn about solving copy-quality debris problems.
Over time, specks of debris might collect on the scanner glass and document feeder white plastic backing, which
might cause print defects. Use the following procedure to clean the scanner if the printed pages have streaks,
unwanted lines, black dots, poor print quality, or unclear text.
1. Press the power button to turn the printer o, and then disconnect the power cable from the electrical
outlet.
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Chapter 9 Solve problems