HP Color LaserJet 5500 Service Manual - Page 402

Repetitive defects troubleshooting NOTE CAUTION Defects on printer rollers can cause image defects to appear at regular intervals on the page. Use the repetitive defects ruler on the next page to measure the distance between defects that recur on a page. Use Table 7-38. Repetitive defect spacing to determine which roller is causing the defect. To resolve the problem, try cleaning the roller first. If the roller is still dirty after cleaning or if it is damaged, replace the indicated part. Letter codes before the roller names in Table 7-38. Repetitive defect spacing correspond to the letters at the top of the repetitive defects ruler. Not all rollers are shown in the ruler. Do not use solvents or oils to clean rollers. Instead, rub the roller with lint-free paper. If dirt is difficult to remove, rub the roller with lint-free paper dampened with rubbing alcohol. Table 7-38. Repetitive defect spacing Roller Distance A toner charging roller 14 mm (.55 inch) B developing cylinder C primary charging roller D toner feed roller 50 mm (1.97 inches) 38 mm (1.5 inches) 43 mm (1.7 inches) E transfer/ media 38 mm (1.5 inches) attaching roller (MAR) F fuser pressure roller 63 mm (2.5 inches) G transfer roller (center to center distance between cartridges) 82 mm (3.2 inches) H photosensitive drum 94 mm (3.7 inches) J fuser sleeve (fuserheated roller) 107 mm (4.2 inches) fuser delivery roller 38 mm (1.5 inches) output bin delivery roller 41 mm (1.6 inches) registration roller 53 mm (2.1 inches) sub registration roller 63 mm (2.5 inches) cassette feed roller 94 mm (3.7 inches) cassette separation roller 94 mm (3.7 inches) cassette pickup roller see note below Type of defect Replacement part defect on front of paper print cartridge blank spots print cartridge defect on front of paper ETB defect on back of paper fuser poor fusing defect on front of paper cartridge blank spots defect on front of paper fuser poor fusing defect on back of paper fuser defect on back of paper fuser defect on front of paper paper pickup unit blank spots paper pickup unit defect on front of paper paper pickup roller kit defect on back of paper paper pickup roller kit defect on front of paper paper pickup roller kit 380 Chapter 7 Troubleshooting ENWW