Print-Quality Problems
Phaser® 5500 Laser Printer
4-55
Horizontal Dark Streaks
There are black lines that 
appear horizontally on the 
page.  
1. The drum cartridge may be 
defective or at the end of its 
life.
2. The paper path may be 
contaminated with toner.
3. The fuser may be defective.
1. Replace the drum cartridge.
2. Print several blank sheets of 
paper to remove the toner 
accumulations.
3. Replace the fuser (in the 
maintenance kit).
Repetitive Vertical Dark 
Streaks
There are black lines that 
appear vertically on the 
page. For more information, 
see "Repeating Defects" on 
page 4-57. 
1. The paper path may be 
contaminated with toner.
2. The drum cartridge may be 
defective or at the end of its 
life.
3. The fuser may be defective.
4. The transfer roller may be 
defective.
1. Print several blank sheets of 
paper to remove the toner 
accumulations.
2. Replace the drum cartridge.
3. Replace the fuser (in the 
maintenance kit).
4. Replace the transfer roller (in the 
maintenance kit).
Dark Spots or Marks
There are dark spots or 
marks that appear in a 
random pattern on the page.  
1. The paper path may be 
contaminated with toner.
2. The drum cartridge may be 
defective.
3. The fuser may be defective.
4. The transfer roller may be 
defective.
1. Print several blank sheets of 
paper to remove the toner 
accumulations.
2. Replace the drum cartridge.
3. Replace the fuser (in the 
maintenance kit).
4. Replace the transfer roller (in the 
maintenance kit).
Diagnosing Print-Quality Problems (Continued)
Problem Causes Solutions