White lines down ; Black toner marks ; across the page- Page 194

TROUBLESHOOTING 6 - 26

HL7050_US_UG_FM5.5

White lines down 

the page

■

You may clear the problem by wiping the scanner 
window with a soft cloth. See Cleaning the inside of 
the printer or the Maintenance Tutorial video on the 
supplied CD-ROM.

Black toner marks 

across the page

■

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

White Spots on black 
text and graphics at 
94mm (3.7 in.) intervals

■

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

Black spots at 94 mm 

(3.7 in.) intervals.

■

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

A B C D
a b c d e
0 1 2 3 4

ABCDEFGH
abcdefghijk

ABCD
abcde
01234

94 mm
(3.7 in.)

94 mm
(3.7 in.)

94 mm
(3.7 in.)

94 mm
(3.7 in.)