HP LaserJet 4000 Service Manual - Page 68

VERIFYING PRINTER MAINTENANCE Before servicing the LaserJet IIISi/4Si, check that the 200,000 page maintenance was done on schedule. It is the customer's responsibility to replace defective parts if printer maintenance is not done at the 200,000 page interval. Use the guidelines below when inspecting printer maintenance parts (see Figure 4-2). 1. Pickup & Separation Rollers 2. Transfer Roller 3. Fusing Assembly 4. Duplex D-Roller Check for glazing. Replace these rollers if the printer has paper input jam problems. Replace the Trarsfer Roller if the printer exhibits poor print quality and repetitive defects associated with the Transfer Roller. Replace the Fusing Assembly if paper jams in the Fusing Assembly or if print quality problems related to poor fusing occur. Replace as indicated by glazing and Duplex Unit failures. -887--- - -O----Th t ....__ Figure 4-2. Location of Printer Maintenance Parts Printer Maintenance: VERIFYING 4-3