From the Quality Menu on the printer control panel, decrease the toner darkness.
Note: 8 is the factory default setting.
Resend the print job.
Did the gray background disappear from the prints?
The problem is solved.
Go to step 2.
Reinstall the imaging unit and the toner cartridge.
Remove the toner cartridge.
Remove the imaging unit.
Warning—Potential Damage: Do not expose the imaging unit to direct light for more than 10 minutes. Extended exposure to light can cause print quality problems.
Install the imaging unit, and then the cartridge.
Go to step 3.
Replace the imaging unit, and then resend the print job.
Contact customer support.