Xerox 3450B Service Manual - Page 89

Image Defect Possible Cause Solution Dark Image: All areas of ■ Verify Remote Control ■ Verify Remote Control Panel the print are too dark. Panel settings. ■ Print Cartridge. setting for the Toner Density menu is not set to "dark." ■ Incorrect high-voltage outputs (Developer Bias voltage). ■ Laser assembly ■ Verify that the high-voltage contacts are operational and make good contact with the print cartridge. ■ Replace the following in order: ■ Print Cartridge ■ Power Supply Board ■ Laser assembly s3450-169 Background: Uniform toner contamination in non-image area ■ Media (paper). ■ Verify that paper meets printer ■ Operating specifications. Print 20 to 30 environment. pages using recommended ■ Print Cartridge. paper. If using recycled paper, try non-recycled paper. ■ Transfer Roller. ■ Printer is installed in specified ■ Incorrect High Voltage environment? outputs. ■ Replace Print Cartridge. ■ Inspect Transfer Roller for contamination and good electrical contact, replace if required. ■ Clean PTL ■ Replace Power Supply Board Ghosting: Image from ■ Operating environment ■ Printer is installed in specified the previous page prints ■ Media (paper) environment? on consecutive pages. ■ Print Cartridge ■ Transfer Roller ■ Fuser assembly ■ Verify that paper meets printer specifications. Print 20 to 30 pages using recommended paper. ■ Incorrect high voltage ■ Determine ghosting pitch and outputs. replace the corresponding assembly. NOTE: Refer to "Defects Associated with Specific Printer Components" on page 5-2 for defect pitch. S6200-284 ■ Replace Power Supply Board. Non-Uniform Image: ■ Print Cartridge ■ Ensure that Cartridge is not out of The Line darkness and ■ Print Cartridge solid-area density image grounding vary across the print. ■ Unstable high voltage output. toner. Inspect Drum for deterioration or contamination. ■ If defective, replace the Print Cartridge. ■ Transfer Roller ■ Verify Print Cartridge ground. contamination. Check continuity between ■ Laser Window or optic contamination. cartridge ground contact and frame ground. Ensure that drum contact is clean and undamaged. ■ Inspect the Transfer Roller spring tension and bearing contacts. ■ Remove Laser assembly, clean window or replace assembly as necessary . ■ Replace Power Supply Board. 5-8 Phaser 3450 Laser Printer Service Manual