Black lines down ; Black spots ; Lines across the page- Page 193

6 - 25 TROUBLESHOOTING

HL7050_US_UG_FM5.5

Black lines down 

the page

Printed pages have toner 
stains stripes down the 
page.

■

The toner cartridge may be damaged.  Put in a new 
toner cartridge. See Replacing the toner cartridge in 
Chapter 5.

■

You may clear the problem by cleaning the primary 
corona wire inside the drum unit by sliding the blue 
tab.  Make sure to return the blue tab to the Home  
position (

). See Cleaning the corona wire in 

Chapter 5.

Black spots 

Black spots at 108 mm 
(4.25 in.) intervals.

■

Print the cleaning page.  To print these two sheets, 
use the control panel Menu buttons to go to the 
INFORMATION menu and then to the 
MAINTENANCE menu to select CLEANING PAGE. 
If the black spots still appear, print the cleaning page 
again. For more information, see Chapter 3.

All black

■

You may clear the problem by cleaning 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 in 

Chapter 5.

■

The drum unit may be damaged.  Put in a new drum 
unit. See Replacing the drum unit in Chapter 5.

Lines across the page

■

The drum unit may be damaged.  Put in a new drum 
unit. See Replacing the drum unit in Chapter 5.

Examples of poor 
print quality

Recommendation

ABCDEFGH
abcdefghijk

ABCD
abcde
01234

108 mm

(4.25 in.)

108 mm

(4.25 in.)

ABCDEFGH
abcdefghijk

A B C D
a b c d e
0 1 2 3 4