Solve image-quality problems
Occasionally, you might encounter problems with print quality. The information in the following sections
helps you identify and resolve these issues.
Image defects table
The following examples depict letter-size paper that has passed through the product short-edge first.
These examples illustrate problems that would affect 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.
Problem Sample Cause Solution
Print is light or faded on entire
page.
Poor contacts exist on the ITB
unit and the product grounding
unit.
Clean the grounding contacts. If the
problem remains after cleaning,
check the contacts for damage.
Replace any deformed or damaged
parts.
Poor secondary transfer
contacts exist on the
secondary transfer roller and
the ITB.
Clean the contacts. If the problem
remains after cleaning, check the
contacts for damage. Replace any
deformed or damaged parts.
Print is light or faded in a
particular color.
Poor primary transfer bias
contacts on the ITB unit and
product.
Clean the contacts of the color that
produces the light print. If the
problem remains after cleaning,
check the contacts for damage.
Replace any deformed or damaged
parts.
Poor primary charging bias
contacts with the print
cartridge and product.
Poor developing bias contacts
with the print cartridge and
product.
Image is too dark. The RD sensor is defective. Replace the RD sensor. See
Registration sensor assembly
on page 112.
Page is blank. The high-voltage power-
supply lower is defective (no
developing bias output).
Replace the high-voltage power-
supply lower. See
Imaging
(developing) high-voltage power
supply on page 152.
One color is missing. The print cartridge for the
missing color has not released
the charge-roller alienation
mechanism.
Remove and reinstall the print
cartridge to release the alienation
mechanism.
240 Chapter 3 Solve problems ENWW
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