Lexmark C736 Series - Streaked Vertical Lines; Toner Fog or Background Shading Appears on the Page

THE TONER CARTRIDGE MAY BE WORN, DEFECTIVE, OR EMPTY
Replace the toner cartridge.
THE FUSER MAY BE DEFECTIVE
Replace the fuser.
THE PHOTOCONDUCTOR MAY BE DEFECTIVE
Replace the photoconductor.
Streaked vertical lines
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These are possible solutions. Try one or more of the following:
THE TONER MAY HAVE SMEARED
Select another tray or feeder to feed paper for the job:
• From the printer control panel Paper Menu, select the Default Source.
• For Windows users, select the paper source from Print Properties.
• For Macintosh users, select the paper source from the Print dialog and pop‑up menus.
THE TONER CARTRIDGE MAY BE DEFECTIVE
Replace the toner cartridge.
THE TRANSFER MODULE MAY BE WORN OR DEFECTIVE
Replace the transfer module.
Toner fog or background shading appears on the page
These are possible solutions. Try one or more of the following:
THE TONER CARTRIDGE MAY BE DEFECTIVE OR INSTALLED INCORRECTLY
Reinstall or replace the toner cartridge.
Troubleshooting 187