HP LaserJet 4250 Service Manual - Page 403

Table 7-25 Grey background (continued) Possible cause Recommended action(s) The customer is printing on the envelope seams. (Printing on an envelope seam can cause a background-scatter problem.) Move the text to an area that has no seams. The toner-density setting is wrong. Open the print-quality menu at the control panel and adjust the tonerdensity setting. See Print-quality submenu. Make sure that EconoMode is off. The high-transfer setting is turned off. Open the print-quality menu at the control panel (see Print-quality submenu). Select OPTIMIZE and set HIGH TRANSFER=ON. The print cartridge is defective. Replace the print cartridge. The high-voltage connector springs are dirty or damaged. The high-voltage connector springs protrude into the print cartridge cavity. Clean the springs if they are dirty. Replace the springs if they are damaged or missing. The power supply is defective. Replace the power-supply assembly. See Power supply. Table 7-26 Loose toner or toner smear Possible cause The interior of the printer is dirty. Recommended action(s) 1 Print a few more pages and see if the problem corrects itself. 2 Clean the inside of the printer (see chapter 4) 3 Process a printer cleaning page. See Running the cleaning page manually. The fuser roller is dirty. Process a cleaning page (see Running the cleaning page manually). Several pages might be required if the fuser is very dirty. The media surface is too smooth or too rough for toner adhesion. Use media that meets HP specifications (see the HP LaserJet Printer Family Paper Specification Guide). The static-eliminator teeth (just beyond the transfer roller) are contaminated or are not grounded, which allows a static charge to remain on the page. Clean the static-eliminator teeth by using a small brush or compressed air. Replace the assembly if it is damaged. Image-formation troubleshooting 389