Xerox 3450B Service Manual - Page 84

Fuser ■ Hot or Cold Offsetting ■ Repeating Defects ■ Voids Repeating Defects Assembly Component Distance between Defects Typical Defect Print Cartridge Developer Roller Drum 49 mm (1.93 in.) 95 mm (3.74 in.) Drum Charge Rollers 38 mm (1.50 in.) Supply Roller 45 mm (1.77 in.) Transfer Roller Transfer Roller Fuser Assembly Heat Roller 57 mm (2.24 in.) 82 mm (3.23 in.) Pressure Roller 92 mm (3.62 in.) Horizontal image band White spots on black image or black spots on white Black spots Light or dark horizontal image bands Image ghost Black spots and image ghost Black spots on back Front Panel Test Print A test print is available to aid in determining the quality of output from the printer and to assist in troubleshooting problems. Each area of the test print is used for a printquality parameter. The following pages explain each of the areas and the print-quality parameters. From the printers front panel menus select Troubleshooting --> Service Tools --> Test Prints. Use supported paper from a fresh, unopened ream (whenever possible), to check the image quality of prints. Make five copies of the test print. Discard the first two prints and retain the remaining prints for image-quality analysis. Print-Quality Troubleshooting 5-3