Solve image quality problems

This section helps you define print-quality problems and what to do to correct them. Often print-quality problems can be handled easily by making sure that the product is maintained, using paper that meets HP specifications, or running a cleaning page.

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.

Table 3-49

Image defects table

 

 

 

 

 

 

 

 

Problem

Sample

 

Cause

Solution

 

 

 

 

 

 

 

 

 

Print is light or faded on entire

 

 

 

 

 

 

Poor contacts exist on the ITB

Clean the grounding contacts. If the

 

 

 

 

 

page.

 

 

 

 

 

 

 

unit and the product

problem remains after cleaning,

 

 

 

 

 

 

 

 

grounding unit.

check the contacts for damage.

 

 

 

 

 

 

 

 

 

Replace any deformed or damaged

 

 

 

 

 

 

 

 

 

parts.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Poor secondary transfer

Clean the contacts. If the problem

 

 

 

 

 

 

 

 

contacts exist on the

remains after cleaning, check the

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

secondary transfer roller and

contacts for damage. Replace any

 

 

 

 

 

 

 

 

the ITB.

deformed or damaged parts.

 

 

 

 

 

 

 

 

 

Print is light or faded in a

 

 

 

 

 

 

Poor primary transfer bias

Clean the contacts of the color that

 

 

 

 

 

particular color.

 

 

 

 

 

 

contacts on the ITB unit and

produces the light print. If the

 

 

 

 

 

 

 

 

product.

problem remains after cleaning,

 

 

 

 

 

 

 

 

 

check the contacts for damage.

 

 

 

 

 

 

 

 

Poor primary charging bias

 

 

 

 

 

 

 

 

Replace any deformed or damaged

 

 

 

 

 

 

 

 

contacts with the print

parts.

 

 

 

 

 

 

 

 

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.

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Page is blank.

 

The high-voltage power-supply

Replace the high-voltage power-

 

 

 

lower is defective (no

supply lower.

 

 

developing bias output).

 

 

 

 

 

 

 

 

 

ENWW

Solve image quality problems 497