Dell S5840cdn - Print quality is poor; Blank or white pages

Print quality is poor
Blank or white pages
Action Yes No
Step 1
a Remove, and then reinstall the imaging unit or imaging kit.
Warning—Potential Damage: Do not expose the imaging unit
or imaging kit to direct light for more than 10 minutes.
Extended exposure to light may cause print quality problems.
Warning—Potential Damage: To avoid damage, do not touch
the underside of the imaging unit or imaging kit.
b Resend the print job.
Is the printer still printing blank or white pages?
Go to step 2. The problem is
solved.
Step 2
Replace the imaging unit or imaging kit, and then resend the print
job.
Is the printer still printing blank or white pages?
Contact
technical
support.
Dark print
Troubleshooting 73