20 Most Recent HP Officejet Pro L7780 All-In-One InkJet Printer Questions & Answers


Make sure the paper guides are tight against the paper. You can also try cleaning the feed rollers with water and dish liquid on a cloth. Check for any paper that is stuck inside. Remove any rear panels that give a straight-through path and check in there. The smallest piece of torn paper will cause this.

If all fails, buy a Canon MP series ;>)

HP Officejet Pro... | Answered on Feb 15, 2018


You may want to try the clean the printhead:

  1. Press the Setup button.
  2. Select Tools.
  3. Select Clean Printhead.

HP Officejet Pro... | Answered on Oct 29, 2017


Beth, Any details on what firmware version worked for you. Have a WRT54GS V7 -- and having same darn issue!! - Jen

HP Officejet Pro... | Answered on Oct 01, 2017


Please follow the below steps.
STEP 1.
1. Un plug the power chord from the back of the printer.
2. Press and hold the power button of the printer.Wait for 30 seconds.
3. While holding the power button, re-plug the power cable.
4. Turn on the printer, if it is not on.
STEP 2.
1. Unplug the power cable from printer when the printer is powered on and wait for 20 seconds.

2. Then, press and hold # and 6 while plugging in the power cord.

Continue holding until it displays Semi Full Reset message in the front panel of the All-in-One.

HP Officejet Pro... | Answered on Oct 01, 2017


Re-install the software for your printer. Download the drivers from the HP website and use the most current drivers for your product.

Also, check disk needs to be run on your unit to verify there are not other issues with your OS(Operating System).

Given the types of codes you have provided, it looks like you are running a Windows OS.
To run the check disk option, press and hold down the Windows Insignia key +S. This will bring up the Windows search option. Type "command prompt" and there should be a secondary window that shows you the results of your search. Look for the Command Prompt option and right-click the option and select "Run as Administrator" by highlighting the option and then left clicking your mouse.

A black window will come up with a variation of,"C:\Windows\System32\"; at this prompt you will see a blinking line\cursor. Type "chkdsk /r" then press enter. A report will come back stating that chkdsk cannot be run on "mounted" volume. Do you want chkdsk to run the next time the computer is restarted? Y\N
Press Y then enter.

Close the command prompt window and restart your PC. *WHEN IT RESTARTS, IT WILL TELL YOU TO SKIP CHECK DISK WITHIN X AMT OF SECONDS... DON'T TOUCH ANYTHING!!!*
Once it has completed, it will boot into Windows normally and if there are any issues, it will tell you during the scanning process.

Hope this helps.

If not, then bring up google.com and download and run this: Downloads AdwCleaner ToolsLib
This may also help.

HP Officejet Pro... | Answered on Jul 13, 2017


the arm in the printer is a cog setting you may have inadvertently knocked it out of alignment, it has free movement on a pivot and spring but when the printer uses it, it pushes on the mechanism to grip the paper and the roller at the bottom freeds it though, sometimes using to thick paper can do the samething. you would need to open up the device and locate the mechanisms, and make sure there is noting in the way of the controller's, i've seen a tiny piece of silver rapper make the same problem.

HP Officejet Pro... | Answered on Jul 02, 2017


Hate to say it, but it means "Don't buy HP printers". You'll be a whole lot happier with Canon or Epson. I had no end of trouble with more than HP all-in-one. They just get flaky after awhile, and the software (particularly scanning) is terrible.

HP Officejet Pro... | Answered on Apr 18, 2017


Uninstall completely all of the software that came with unit and then reinstall it.

And HP customer service sucks - they will only help you out during the warranty period of their product.

HP Officejet Pro... | Answered on Mar 22, 2017


If you subscribe to a caller ID service through your phone provider, you can block
specific fax numbers so the device does not print faxes received from those numbers.
When an incoming fax call is received, the device compares the number to the list of
junk fax numbers to determine if the call should be blocked. If the number matches a
number in the blocked fax numbers list, the fax is not printed.
Set the junk fax mode
By default, Block Junk Fax mode is turned On. If you do not subscribe to a caller ID
service through your phone provider, or do not want to use this feature, you can turn
off this setting.
To set the junk fax mode
▲ Some models have a Block Junk Fax button. Depending on the model you have,
do one of the following:
Block Junk Fax button: Press the Junk Fax Blocker button, select the Block
Junk Fax option, and then select On or Off.
Color display menu: Press Setup, select Basic Fax Menu, select Junk Fax
Blocker Setup, select Block Junk Fax, and then select On or Off.
Add numbers to the junk fax list
There are two ways to add a number to your junk list. You can select numbers from
your caller ID history, or you can enter new numbers. The numbers in your junk list are
blocked if Block Junk Fax mode is set to On.

HP Officejet Pro... | Answered on Nov 23, 2016


Blue is made from magenta (pink) and cyan ( sky blue), if your blues are coming out pink then they are missing the cyan component.

In your machine this could be caused by a blockage in the printhead, the cyan cartridge being empty, an electronics fault, a boma pump fault (the squishy black thing on the base of the cartridge). Check your cartridge first - if it feels lighter than the other it is probably empty. Sometimes there is a fault where the entire contents of a cartridge (usually the cyan) can be emptied in a matter of days or less. If the cartridge is unusually empty compared to the other colours - refer it to HP.

HP Officejet Pro... | Answered on May 10, 2015


Solid black in a copy typically means that the scanner is partially blocked. Open the top, where you'd place a sheet to be copied, and examine the small strip that runs down the side (left, most likely). See if it's clear, or if something is covering part of it.
Most copiers don't use the full size scanning plate for copies, but use a strip that scans the paper as it moves across it. If something blocks part of it, you get the black area.

HP Officejet Pro... | Answered on Apr 12, 2015


Dear
Pl. check the ink cart. if refilled or compatible used replace with genuine.

Thanks.

HP Officejet Pro... | Answered on Mar 13, 2015


There should be a textured seperator pad, if that's worn out, replace it. Also check the ADF rollers should not be smooth. You may need to just replaced the ADF maintenance kit. It should include the roller assembly and seperator pad.

HP Officejet Pro... | Answered on Feb 13, 2015


clean the gold contacts where the ink cartridges seat with alchol and microfiber towel replace ink cartridges.

HP Officejet Pro... | Answered on Oct 09, 2014

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