- Hewlett-Packard Laser Printer User's Guide

Troubleshooting
6 - 11
6
Gray background
Make sure that you use paper that meets the recommended specifications. See
What kind of paper can I use? on page 1-4
Check the printer’s environment - high temperatures and high humidity can
increase the amount of background shading. See Positioning the printer on page
1-3.
Use a new toner cartridge. See Replacing the toner cartridge on page 5-3
Use a new drum unit. See Replacing the drum unit on page 5-8.
Ghost
Make sure you use paper that meets our specifications. Rough-surfaced paper
or thick print media may cause this problem. See What kind of paper can I use?
on page 1-4.
Make sure that you choose the appropriate media type in the printer driver. See
What kind of paper can I use? on page 1-4.
Try using a new drum unit. See Replacing the drum unit on page 5-8.
Toner specks
Make sure that you use paper that meets our specifications. Rough-surfaced
paper may cause the problem. See What kind of paper can I use? on page 1-4.
The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 5-8.
Hollow print
Make sure that you use paper that meets our specifications. See What kind of
paper can I use? on page 1-4
Choose Thick paper mode in the printer driver, or use thinner paper than you
are currently using.
Check the printer’s environment because conditions such as high humidity can
cause hollow print. See Positioning the printer on page 1-3.
All black
Clean the primary corona wire inside the drum unit by sliding the blue tab. Make
sure you return the blue tab to the home position (). See Cleaning the corona
wire on page 5-14.
The drum unit may be damaged. Put in a new drum unit. See Replacing the drum
unit on page 5-8.
Examples of poor print
quality
Recommendation
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