Question about HP Officejet Pro L7780 All-In-One InkJet Printer

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HP Officejet Pro L7780 constantly gives false"paper jam" error

The first printer I got gave paper carriage jam error and the HP support line could not solve the problem and set a replacement printer. The new printer has only printed 50 some copies and there have been 5 paper jam error messages but not once has there been a jammed paper. I have followed the instructions to correct this problem but it will not stop. The printer goes through the printer check mode and takes forever. Today it happened in the middle of a fax coming in! Any suggestions?

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  • joious May 19, 2009

    How do I know which reset to do?

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Step 1:
======
The rollers should be cleaned if the paper fails to feed smoothly into the unit. All document and media rollers should be cleaned using a lint-free cloth lightly moistened with water.

1. The unit must be powered down and the power cord unplugged before cleaning the rollers. This will allow the rollers to be turned by hand in most cases. The paper should also be removed before cleaning the rollers.
2. Remove the rear access door to access the rollers. Clean any dust and debris from the rollers.
3. Open the unit and check the four small metal paper rollers (not the rubber rollers) in the interior of the unit. They should be clean and move freely. If these are not bright and shinny or have buildup on them, they should be cleaned. Also clean any dust and debris off of the rubber rollers.
4. Close the unit and reattach the rear access door.
5. Plug the power cord back in and power the unit up. It should reinitialize for about 20 seconds.

6. Print another extended self-test page.

Step 2:
======

==== Partial Reset ====
Press and hold # and 3 button on the unit while plugging in the power cord.
Note: For models that are not fax capable, press Plus (+) instead of #.

==== Semi Full Reset ====
Press and hold # and 6 button on the unit while plugging in the power cord.
NOTE: For models that are not fax capable, press plus (+) instead of #.

==== NVM RAM Reset ====
Press and hold OK and Cancel button while plugging in the power cord

Posted on May 19, 2009

  • vishwanathu May 22, 2009

    You can try all the resets one by one and then check for the resutls

  • vishwanathu May 22, 2009

    Try all the resets one by one and check for the results

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  • 13 Answers

Printer tells me that ink cartrigde is empty and i must chage cartridge so i did but it tell me the same thing, how can i reset or get this once on

Posted on Dec 08, 2009

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The print carriage access door is the large top part of the printer that swings up. If you look in the user guide it is arrowed on page 14.

If you don't have a copy you can download it here:

http://h10032.www1.hp.com/ctg/Manual/c00863866.pdf

Hope this helps

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My HP Officejet Pro L7780 All-In-One InkJet Printer was jammed with paper. I believe I got it all out and now the display reads" Printhead problem- the following printhead has a problem: magenta/cyan...


There are two possibilities here Joanne, first, it could be a false error message or else second, the Cyan/Magenta print head has gone bad.Try the following:
1. Take the Cyan/Magenta printhead out. Remember, the printhead...not the cartridges.
Clean the copper contacts with a Q Tip, moistened with plain water. Wait till it dries, put the printhead back in.
2. If this does not resolve the issue, unplug the power cord from the back and press and hold the power cord for 30 sec. This will drain all the static charges. Plug it back after a couple of minutes and see if the error message re appears.

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