Technical data

7.12 Black Spots
3. The distance between repeating spots indicates which roller
caused the defect. Measure the distance between the spots
and see if it compares to the distances below. Inspect the
indicated rollers or inspect all paper path rollers for damage or
contamination.
Component Millimeters Inches
Registration rollers 44.0 1.73
Fusing pressure roller 79.0 3.11
Fusing heat roller 95.0 3.74
Print drum 125.0 4.92
Developer 56.0 2.2
4. Swap the print drum cartridge.
5. Remove the developer unit and inspect the developer roller. Turn
the developer roller clockwise to check for sticking or binding.
Make sure toner is distributed evenly around the circumference
of the roller.
6. Swap the developer unit.
7.13 Fusing Failure
Description: Fusing failure is indicated when you can brush or rub the toner
off the sheet.
Troubleshooting: Print several copies of the grid test pattern, as shown in
Section 3.3. Use the following procedure if fuser failure is evident:
1. Make sure the paper or any special stock meets specifications listed in
Appendix B. Fusing problems occur when printing on extremely rough,
heavily textured, or high rag content papers.
2. The paper might be damp. Try some dry paper from the center of a fresh
package.
3. Make sure the rear cooling fan is operational, as shown in Section 4.3.
4. Inspect the following fuser components:
• Paper might be wrapped around one of the fusing rollers.
• Heat or pressure roller might be damaged or swollen.
Image Defects FIPs 7–17