HP 4550 Service Manual - Page 263
Toner smear, Vertical lines or streaks, Vertical black lines - laser printer vertical lines
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CAUTION Toner smear There is dirt on the paper. The fusing rollers are dirty. The paper does not meet HP specifications. The toner cartridge is defective. The fusing assembly is defective. There is loose toner in the printer. The static eliminator is dirty or is not grounded, allowing a static charge to remain on a page. The DC controller PCA is defective. Vertical lines or streaks Check for a leak where light might be entering the printer. Check for circumferential scars on the photosensitive drum. If scars are present, replace the drum cartridge if the line goes through all colors. Check for circumferential scars on the upper fusing roller. If scars are present, replace the upper fusing roller if the line goes through all colors. Remove the imaging drum and inspect main charger or imaging drum for a contaminant, such as a fiber, if the line goes through all colors. Do not expose the imaging drum to light for more than 15 seconds. The drum is light sensitive, and exposure to light can cause permanent damage. Vertical black lines The toner cartridge is defective. The toner cartridge is not seated properly. The fuser entrance is dirty. The fuser has scratches on it. This might be a repetitive defect. If so, the lines will repeat at a consistent interval down the page. The printer needs to be cleaned. There is a problem in the heating element. Vertical white lines If white lines or streaks appear only in the black areas of the printed media, print several configuration pages to clear the anomaly. If this does not clear the problem, check the sleeve surface to confirm the defect, then replace the black toner cartridge. If white lines appear only in a particular color, try printing several configuration pages to clear the error. If the error does not clear, check the sleeve surface to confirm the defect, then replace the defective toner cartridge. There is a lack of toner or the toner cartridge is faulty. There is dirt in the laser path. The fuser is defective. A mirror in the laser scanner is dirty. C7085-90921 Chapter 7 Troubleshooting 261