Try to clean the print cartridge nozzles. On your computer, open the Lexmark Solution Center by going to the Start menu > Programs / All Programs > Lexmark Z600 Series > click the Maintenance tab > under Select Maintenance tool, select Clean to fix horizontal streaks > click Print. The printer will then print a test page forcing ink through the cartridge nozzles and clean them.
If that doesn't help, remove the black cartridge and try to manually wipe the cartridge nozzles with a slightly moistened soft cloth to clean it from dirt and clogs. After wiping the nozzles, reinsert the cartridge into the printer. Print a document again to verify that the problem is fixed.
If the problem continues, try to insert a different known working black cartridge to identify if it's a faulty cartridge issue.
If you still need assistance, please contact Lexmark Technical Support Center.
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