12 - 20; Black toner marks across ; White lines across the page- Page 181

TROUBLESHOOTING AND ROUTINE MAINTENANCE   

12 - 20

Black toner marks across 

the page

The drum unit may be damaged. Put in a new drum unit. (See 

Replacing 

the drum unit

 on page 12-34.)

Make sure that you use paper that meets our specifications. (See 

About 

paper

 on page 2-1.)

If you use label sheets for laser printers, the glue from the sheets may 
sometimes stick to the OPC drum surface. Clean the drum unit. 
(See 

Cleaning the drum unit

 on page 12-27.)

Do not use paper that has clips or staples because they will scratch the 
surface of the drum.
If the unpacked drum unit is in direct sunlight or room light, the unit may 
be damaged.

White lines across the page

Make sure that you use paper that meets our specifications. A rough 
surfaced paper or thick print media can cause the problem.
Make sure that you select the appropriate media type in the printer 
driver. 
The problem may disappear by itself. Try printing multiple pages to clear 
this problem, especially if the printer has not been used for a long time.
The drum unit may be damaged. Put in a new drum unit. (See 

Replacing 

the drum unit

 on page 12-34.)

Lines across the page

Clean the inside of the printer and the primary corona wire in the drum 
unit. (See 

Cleaning the drum unit

 on page 12-27.)

The drum unit may be damaged. Put in a new drum unit. (See 

Replacing 

the drum unit

 on page 12-34.)

Black lines down the page

Printed pages have toner 
stains down the page.

Clean the primary corona wire of the drum unit.
Make sure the primary corona wire cleaner is at the home position (

▲

). 

The drum unit may be damaged. Install a new drum unit. (See 

Replacing 

the drum unit

 on page 12-34.)

The toner cartridge may be damaged. Put in a new toner cartridge. 
(See 

Replacing the toner cartridge

 on page 12-28.) Make sure that a 

torn piece of paper is not inside the printer covering the scanner window.
The fixing unit may be smudged. Call Customer Service.

White lines down the page

You may clear the problem by wiping the scanner window with a soft 
cloth. (See 

Cleaning the printer

 on page 12-26.)

The toner cartridge may be damaged. Put in a new toner cartridge. 
(See 

Replacing the toner cartridge

 on page 12-28.)

Page skewed

Make sure the paper or other print media is loaded properly in the paper 
tray and that the guides are not too tight or too loose against the paper 
stack.
Set the paper guides correctly.
If you are using the manual feed tray (or the multi-purpose tray). 
(See 

How to load paper

 on page 2-5.)

The paper tray may be too full.
Check the paper type and quality. (See 

About paper

 on page 2-1.)

Curl or wave

Check the paper type and quality. High temperatures and high humidity 
will cause paper to curl.
If you don’t use the printer very often, the paper may have been in the 
paper tray too long. Turn over the stack of paper in the paper tray. Also, 
try fanning the paper stack and then rotating the paper 180° in the paper 
tray.
Try printing using the straight-through output path. (See 

How to load 

paper

 on page 2-5.)

Examples of poor print 
quality

Recommendation

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