Lexmark MX810 Series - Printer is Printing Solid Black Pages; Print Irregularities

Printer is printing solid black pages
Action Yes No
Step 1
a Reinstall the imaging unit.
1 Remove the toner cartridge, and then the imaging unit.
Warning—Potential Damage: Do not expose the imaging unit to
direct light for more than 10 minutes. Extended exposure to
light may cause print quality problems.
2 Install the imaging unit, and then the cartridge.
b Resend the print job.
Is the printer printing solid black pages?
Go to step 2. The problem is solved.
Step 2
Replace the imaging unit, and then resend the print job.
Is the printer printing solid black pages?
Contact
customer
support.
The problem is solved.
Print irregularities
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ABCDE
ABCDE
ABCDE
Leading edge
Trailing edge
Action Yes No
Step 1
a Move the width and length guides in the tray to the correct positions
for the size of the paper loaded in the tray.
b Resend the print job.
Do print irregularities still appear?
Go to step 2. The problem is solved.
Troubleshooting 340