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Repetitive Defects Ruler - HP LaserJet M601, M602, M603

The repetitive defects ruler can help pinpoint the cause of repeating defects. Measurement is taken from the first occurrence of the defect to the second occurrence.

Special note: Bad toner cartridges are the most frequent cause of print defects. As you examine the defect ruler, please note that the following components are internal to the toner cartridge: Primary Charging Roller, Developing cylinder or roller, Toner cartridge photosensitive drum. If these parts are identified as the problem, you will need to replace the toner cartridge.

Ruler for HP LaserJet M601, M602, M603

Component Distance between defects
Primary charging roller 37.7 mm (1.5 inches)
Transfer roller 47 mm (1.85 inches)
Developer roller 63 mm (2.5 inches)
Tray 1 pickup roller 63 mm (2.5 inches)
Tray 1 feed roller
Tray 1 separation roller
79 mm (3.1 inches)
Tray 2 feed roller
Tray 2 pickup roller
Tray 2 separation roller
79 mm (3.1 inches)
Fuser sleeve unit or pressure roller 94 mm (3.75 inches)
Photosensitive drum 94 mm (3.75 inches)