HP LaserJet Enterprise 500 Service Manual - Page 535

Table 3-49 Image defects table (continued) Problem Sample Vertical white lines appear in a particular color. Vertical white lines appear in all colors. Horizontal lines appear on the page. A horizontal white line appears on the page. Cause Solution The laser beam window is dirty. Clean the window and remove any foreign substances. Scratches are present on the circumference of the developing cylinder or photosensitive drum. White scratch down the page could mean the scanner glass needs to be cleaned. Remove the affected print cartridge and re-install. The PGCs will clean the glass. If the problem persists, replace the affected print cartridge. The laser/scanner-unit mirror is dirty. Replace the laser/scanner assembly. Horizontal scratches on the fuser roller. Replace the fuser. Scratches are present on the circumference of the ITB. White scratch down the page could mean the scanner glass needs to be cleaned. Remove the affected print cartridge and re-install. The PGCs will clean the glass. Replace the ITB. Repetitive horizontal lines appear. Use the repetitive defects ruler to identify the dirty roller. Clean the roller. If the roller cannot be cleaned, replace the fuser. Horizontal scratches are present on the photosensitive drum. Replace the print cartridge of the color that matches the defect. Horizontal scratches are present on the fuser roller. Replace the fuser. Repetitive horizontal white lines appear. Use the repetitive defects ruler to identify the dirty roller. Clean the roller. If the roller cannot be cleaned, replace the roller. Horizontal scratches are present on the photosensitive drum. Replace the print cartridge of the color that matches the defect. Scratches are present on the circumference of the ITB. Replace the ITB. ENWW Solve image quality problems 499