Lexmark MX432 Users Guide - Page 202
Vertical dark lines or streaks
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Troubleshoot a problem 202 Action Yes Step 3 a Remove, and then insert the imaging unit. Contact customer support. Warning-Potential Damage: Do not expose the imaging unit to direct light. Extended exposure to light may cause print quality problems. Warning-Potential Damage: Do not touch the photoconductor drum. Doing so may affect the quality of future print jobs. b Print the document. No The problem is solved. Do vertical dark bands appear on prints? Vertical dark lines or streaks Note: Before solving the problem, print the Print Quality Test Pages. From the home screen, touch Settings > Troubleshooting > Print Quality Test Pages. Action Yes Step 1 Go to step 2. a Check if the printer is using a genuine and supported Lexmark toner cartridge. Note: If the toner cartridge is not supported, then install a supported one. b Print the document. No The problem is solved. Do vertical dark lines or streaks appear on prints? Step 2 Go to step 3. a Remove the printhead wiper, and then clean the printhead lens. b Print the document. The problem is solved. Do vertical dark lines or streaks appear on prints?