I have just downloaded a manual in PDF format and wish to print it out. I have not had a problem before doing this, but this time the screen pages show intersecting lines towards each corner with circles midway between them. I take these to be some form of marking out the page for trimming or similar.
I wish to print out without those marks appearing in the printed output.
Perhaps you could increase the page magnification, when printing, to push the cross hair lines off the edges of the page. You will probably need to centre the page vertically and horizontally when printing so that you don't loose the text of the edge of the page.
I suspect that this is down to how the manual was converted to pdf. These sound like pre-press marks which should be outside of the print area. I'm not sure how you can remove them at this stage. Try printing one page and see if it actually prints.
I'm not sure which programme you are using to view and print your PDF file, but I use Foxit PDF Reader. When I want to print the PDF I click the Printer icon and the Print dialog screen is shown. In the Print Handling section, if you select Custom Scale as the Scaling Type, the Page Zoom will be available. You will need to use a Page Zoom of about 102% to 105% to push the lines, you don't want to print, off the edge of the page in the preview. Select Auto-Centre to clip the lines without any text being cut off.