Questions & Answers for: HP OfficeJet 7780 manual

printhead problem (black/yellow) on HP L7780 A piece of paper jammed in the machine which I extracted, but now I get the error message "The following printhead(s) has a problem: black/yellow. Can't ...

Our Officejet Pro 7780 is printing dark stripes over pages. I can see the document that I am trying to print on the page, but it is covered with large patches of dark ink and is barely visable. It was

will the hp 7780 receive faxes on legal paper? Their should be settings in the menu for legal paper. Do you have the manual. If not, you can get it on HP's website.

My HP 7780 always says phone off hook. When I disconnect the phone line for awhile and reinstall it faxes once properly then the phone off hook message reappears. I use a VOIP line and get the same ...