HP LaserJet Pro M402d

Solve image quality problems
You can prevent most print-quality problems by following these guidelines.
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Print quality examples
Print quality examples
The following examples depict Letter-size paper that has passed through the product short-edge rst. These
examples illustrate problems that would aect all the pages that you print, whether you print in color or in
black only. The topics that follow list the typical cause and solution for each of these examples.
Table 2-12 Print quality examples
Problem Cause Solution
Print is light or faded. The media might not meet
HP specications.
Use media that meets HP specications.
The toner cartridge might be defective. Print the supplies status page to check the
remaining toner cartridge life.
Replace the toner cartridge.
The product is set to override the Replace
black cartridge message and to continue
printing.
Replace the toner cartridge.
The print density setting might have been
changed.
Set the print density setting to 0.
Poor contact exists between the transfer
roller contact and the transfer roller shaft.
Clean the contacts. If the problem remains
after cleaning, check the contacts for
deformation or damage. Replace any
defective parts.
Page has dark print. Poor contact exists between the drum
grounding contact and the toner cartridge.
Clean the grounding contacts. If the
problem remains after cleaning, check the
contacts for deformation or damage.
Replace any defective parts.
Poor contact exists between the primary
charging bias contact and the toner
cartridge.
Clean the contacts. If the problem remains
after cleaning, check the contacts for
deformation or damage. Replace any
defective parts.
The page is blank. The high-voltage power supply is defective
(no developing bias output).
Replace the high-voltage power supply
PCA.
ENWW Solve image quality problems 143