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Brother HL-1850 User Manual

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CHAPTER 6 TROUBLESHOOTING 
 
 
6-27 
 
Image Defect Examples 
Recommendation 
 
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Black Horizontal Repetitive Defects 
Toner scatters and stains the printed 
page. 
 
• 
The drum unit may be damaged. Put in a new drum unit.  
• 
Make sure you use paper that meets our specifications.  
 
Note  
• 
If you use label sheets for laser printers, the glue from the sheets 
may sometimes stick to the drum surface.  Clean the drum unit.  
See the previous page.   
• 
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, it may 
be damaged. 
 
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White Horizontal Stripes  
 
• 
Make sure you use paper that meets our specifications. Rough 
or thick paper can cause the problem. 
• 
Make sure you chose the appropriate media type in the printer 
driver.   
• 
The problem may disappear by itself.  Try printing a few pages to 
clear this problem especially if you have not used the printer for a 
long time. 
• 
The drum unit may be damaged. Put in  a new drum unit.  
 
ABCDEFGH
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Horizontal Lines 
 
• 
The Drum Unit may be damaged. Put in a new Drum Unit.  
 
ABCDEFGH
abcdefghijk
A B C D
a b c d e
0 1 2 3 4
 
Black Vertical Lines 
Printed pages are stained with toner 
or have vertical stripes. 
 
• 
The Toner Cartridge may be damaged. Put in a new Toner 
Cartridge.  
• 
The fixing unit may be smudged.  Call Customer Support. 
• 
Clean the Corona Wire.  See 
• 
Return the tab on the drum unit to the Home position.