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Print Quality Troubleshooting Tool for HP Color LaserJet 3600

Lines or spots repeating at various intervals

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If your issue is listed here,

Interval	Roller	Description	Replacement Part
1.1 inch (27 mm)	Primary charging roller	Dirt on front of paper, blank spots	Print cartridge
1.1 inch (27 mm)	Developing cylinder	Dirt on front of paper, blank spots	Print cartridge
1.4 inch (35 mm)	Registration roller (inside)	Dirt on front of paper	Paper pickup unit
1.4 inch (36 mm)	Registration roller (outside)	Dirt on back of paper	paper pickup unit
1.7 inch (44 mm)	Transfer roller	Blank spots, Dirt on back of paper	N/A
3.0 inch (75 mm)	Fuser sleeve	Dirt on front of paper, blank spots, poor fuser	Fuser
3.1 inch (79 mm)	Fuser prssure roller	Dirt on front of paper, dirt on front of paper, poor fuser	Fuser
*Note: Defects on paper tray or the multipurpose tray pickup roller cause defects only on the leading edge of the image.