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The small display on the L7780 only have lines.Ho do I make the display reappear?

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1 Answer

Partial print on incoming fax


Check your incoming line and settings or try to reinstall the drivers. Also, check the user manual for HP Officejet Pro L7780

Jun 25, 2013 | HP Officejet Pro L7780 All-In-One InkJet...

2 Answers

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 error msg. Here's what I do- I dial the fax number with the line unplugged (hence no off-hook message), press "start Fax", and as soon as I hear the fax machine "Click" to pickup the line, I put the line in the machine. Works every time!

Oct 10, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

I have two or three lines per page on my Officejet Pro L7780 that do not print the full letters on the line. Ink is full, but the two or three lines on each page do not print fully.


remove the printer heads and just dip the bottom in some hot water for about 20secs. (JUST THE BOTTOM)This should unblock the ink . Dry and iput back into printer

Apr 13, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

My HP L7780 prints a vertical line down the right side of the page when I COPY or SCAN. It prints files perfectly. Can anyone help?


If you open up the tray on the printer you will see a diagram explaining how to clean a small blue screen. I did this with our printer and the problem cleared right up.

Jan 16, 2010 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

Slow Faxes


Slow faxes would have to do with the fax machine itself or the line quality of the line that is connect to this fax, noise on the line will do this and will also give error messages on the other end so check this..

May 21, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

I want to fax using my HP OfficeJet Pro L7780. I


Click here for online manual and setup guides.
Clcik here to view DSL phone line setup instructions
& here for the general fax menu

I hope this information allows you to resolve this issue. If you need further assistance, please post back with a comment to this thread.
If I've managed to answer your question or solve a problem, please take a moment to kindly rate this post....thanks!



Apr 08, 2009 | HP Officejet Pro L7780 All-In-One InkJet...

1 Answer

Error "HO"


If your hot water isn’t hot enough it will display “HO” while heating the water to operating temperature.

Thank You Huum
Please remember to leave a solved rating before you sign off!

Dec 20, 2008 | Dishwashers

1 Answer

Hp l7780 all in one


I just purchased a hp officejet pro L7780 all in one wireless trying to set up system - was suppose to have a poster sheet to guide me -- NO GUIDE POSTER - can i view one on line somewhere at no cost -

Nov 11, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

4 Answers

Occasionally bottom line of document only partially prints


Goto Office button-> Print-> properties-> Change paper size to A4

May 05, 2008 | HP Officejet Pro L7780 All-In-One InkJet...

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