Subtle grid lines appear in my pdf

After printing a pdf in Acrobat 11, I notice subtle grid lines which are not visible on my monitor, even at 1600 magnification.  Can you explain how these are appearing, and how to prevent it?   I'm printing on an HP OfficeJet L7680 or OfficeJet 8600.
Who is Participating?
I wear a lot of hats...

"The solutions and answers provided on Experts Exchange have been extremely helpful to me over the last few years. I wear a lot of hats - Developer, Database Administrator, Help Desk, etc., so I know a lot of things but not a lot about one thing. Experts Exchange gives me answers from people who do know a lot about one thing, in a easy to use platform." -Todd S.

Do you mean the lines in the corners that look like print lines
ddantesAuthor Commented:
Hi Gary.  No, those are trim lines which I inserted.   On the printed page, there are subtle, dark vertical lines at regular intervals.  One is at the same horizontal coordinate as the right margin of the photo, one corresponds to the left margin of the photo, there are three others within the area of the photo -- spaced at regular intervals.  They are seen most easily against the background of the brown border.    I scanned a print-out and marked a few lines...Scan showing subtle lines
It looks very much like banding from your printer (99% sure), have you tried printing a coloured page on the printer to see if it is just the printer.
Are you printing in draft quality mode?

Experts Exchange Solution brought to you by

Your issues matter to us.

Facing a tech roadblock? Get the help and guidance you need from experienced professionals who care. Ask your question anytime, anywhere, with no hassle.

Start your 7-day free trial
ddantesAuthor Commented:
Good news!  The lines appear in a colored page, and vanish with "best" quality printing.  Good observation.
It's more than this solution.Get answers and train to solve all your tech problems - anytime, anywhere.Try it for free Edge Out The Competitionfor your dream job with proven skills and certifications.Get started today Stand Outas the employee with proven skills.Start learning today for free Move Your Career Forwardwith certification training in the latest technologies.Start your trial today
Adobe Acrobat

From novice to tech pro — start learning today.