HP LaserJet Pro M1130 Service Manual - Page 139
Print-quality troubleshooting tools, Repetitive defect ruler
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Print-quality troubleshooting tools Repetitive defect ruler If the product output has a consistent, repetitive defect, and 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 Primary charging roller Photosensitive drum Developing roller Transfer roller Fuser film Distance between defects (mm) About 27 About 75 About 34 About 39 About 57 Pressure roller About 56 Type of defects Dirt on page Dropouts Dirt on page Dropouts Dirt on page Dropouts Dropouts Dirt on the back of page Dirt on page Dropouts Loose toner Dirt on the back of page Loose toner ENWW Tools for troubleshooting 119
Print-quality troubleshooting tools
Repetitive defect ruler
If the product output has a consistent, repetitive defect, and 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
ENWW
Tools for troubleshooting
119