HP 3390 Service Manual - Page 283

Troubleshooting diagrams ● Repetitive image defects ● Interface connectors ● Formatter connectors ● Line interface unit (LIU) ● Solenoids ● Switches and sensors ● Rollers and pads ● PCAs (base unit) ● Major components (base unit) ● Scanner and ADF ● Circuit diagram Repetitive image defects If the all-in-one output has a consistent, repetitive defect, then use Table 7-6 Repetitive image defects on page 261 to determine which part needs to be replaced based on the measured distance between the repetitions of the defect. NOTE The following table replaces the graphical repetitive defect ruler. You can make your own ruler by using these measurements. Table 7-6 Repetitive image defects Distance between identical Dirty or damaged roller defects 37.7 mm (1.48 inches) Primary charging roller 43.0 mm (1.69 inches) Registration roller 44.0 mm (1.73 inches) 46.2 mm (1.82 inches) 56.5 mm (2.22 inches) 69.0 mm (2.72 inches) 75.4 mm (2.97 inches) Developing cylinder Transfer roller Fuser film Pressure roller Photosensitive drum Solution Replace the print cartridge. Replace the registration assembly (see Registration-roller assembly on page 168). Replace the print cartridge. Replace the transfer roller. Replace the fuser (see Fuser on page 148). Replace the fuser (see Fuser on page 148). Replace the print cartridge. ENWW Troubleshooting diagrams 261