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? in Chapter 2.
 Check the printer’s environment - high temperatures and high humidity can 
increase the amount of background shading. See Positioning the printer on page 
2-4.
 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 2-5. 
 Make sure that you choose the appropriate media type in the print driver. See 
What kind of paper can I use? on page 2-5.
 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 2-5.
 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? in Chapter 2.
 Choose Heavyweight 1 mode in the print 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 2-4. 
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
ABCDEFGH
abcdefghijk
ABCD
abcde
01234
ABCDEFGH
abcdefghijk
ABCD
abcde
01234