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.
Flattened.pdf
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ddantesAsked:
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GaryCommented:
Do you mean the lines in the corners that look like print lines
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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
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GaryCommented:
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?
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ddantesAuthor Commented:
Good news!  The lines appear in a colored page, and vanish with "best" quality printing.  Good observation.
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