HP Color LaserJet Enterprise CM4540 Service Manual - Page 519

3. Touch the Print Quality Pages button. 4. Touch the Color Band Test button. 5. Touch the Print Test Page button. 6. Touch the Print button. Print-quality troubleshooting tools Repetitive defects ruler If defects repeat at regular intervals on the page, use this ruler to identify the cause of the defect. Place the top of the ruler at the first defect. The marking that is beside the next occurrence of the defect indicates which component needs to be replaced. Figure 3-85 Repetitive defects ruler 0 mm 27 mm 32 mm 44 mm 48 mm 51 mm 55 mm 63 mm 76 mm 80 mm 96 mm 101 mm Distance between defects 27 mm 32 mm 44 mm 48 mm 51 mm Product components that cause the defect Print cartridge Print cartridge Transfer unit Print cartridge Transfer roller ENWW Tools for troubleshooting 467