HP CM3530 Service Manual - Page 458

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 7-42 Repetitive defects ruler 0 mm 27 mm 32 mm 44 mm 49 mm 50 mm 63 mm 66 mm 75.5 mm 76 mm 77 mm 78 mm 80 mm 92 mm 105 mm Distance between defects 27 mm 32 mm 44 mm 49 mm 50 mm 63 mm 66 mm 75.5 mm 76 mm 77 mm 78 mm 428 Chapter 7 Solve problems Product components that cause the defect Print cartridge: primary charge roller Print cartridge: developer roller Printer: primary transfer roller Print cartridge: RS roller Printer: secondary transfer roller ITB: secondary transfer backing roller Printer: distance from secondary transfer roller to fuser Print cartridge: OPC drum ITB: driven roller Fuser sleeve Fuser pressure roller ENWW