Print-quality troubleshooting tools
Repetitive defect ruler
If the product output has a consistent, repetitive defect, then use the table in this section to determine
which part needs to be replaced based on the measured distance between the repetitions of the defect.
Component Distance between defects (mm) Type of defects
Primary charging roller About 27 Dirt on page
Dropouts
Photosensitive drum About 75 Dirt on page
Dropouts
Developing roller About 34 Dirt on page
Dropouts
Transfer roller About 39 Dropouts
Dirt on the back of page
Fuser film About 57 Dirt on page
Dropouts
Loose toner
Pressure roller About 56 Dirt on the back of page
Loose toner
Interpret control-panel light patterns
Table 3-2 Status-light legend
Symbol for “light off”
Symbol for “light on”
Symbol for “light blinking”
128 Chapter 3 Solve problems ENWW
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