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

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Printer won't print in black

I think the printheads need to be changed, how to change printheads in all in one HP 7780 model.

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If you need to change the printheads on this printer you need to do the following:

- Open the main lid (not the scanner one)
- Check the LED Screen on the printer and you will see that it gives you the instructions to hold down the "OK" button on the printer panel for 5 seconds if you want to change the printhead... So do this... Hold the OK button.

The printer will now move the printheads into the exchange position.. Wait a few seconds for the printhead carriage to stop moving around as sometimes it can catch your fingers..then:

- Lift the blue flap (lift from the front - hinge at the back)
You should now see the printheads

- Carefully lift the little blue plastic handle for the printhead and pull this up and out to lift the printhead out that you want to change


Now for your new printhead:

- Before you install it, shake it back and forth 6 times as shown to shake up and mix the ink that's pre-filled in the cartridge.

- Pull the orange covers and plugs off/out as shown

- Carefully slot the printhead into the position vacated by the old one. You may find that you need to slot it in by angling it slightly but be patient...

Once the new printhead is in position (check the other printhead to check they're the same level ie: that the new printhead is all the way in).

- Close the blue flap back into the closed position

- Close the main lid


The printer will then begin a priming routine and after a few minutes you can start to use your printer again..

Posted on Jan 27, 2009

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It sounds like the print heads in the 7780 are bad. Don't confuse the ink cartridges with print heads. The cartridges fit inside the print heads. You will need to change the heads. Here is a link to HP's how-to.
http://h10025.www1.hp.com/ewfrf/wc/document?docname=c00841890&tmp_track_link=ot_faqs/top_issues/en_us/c00841890/loc:1&lc=en&dlc=en&cc=us&lang=en&product=2512010

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WWW.HP.COM/MAC
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1 Answer

Streaks though the pages


Step one: Retry the print job The problem may occur only rarely. If you have not seen it in other printouts, try again. Step two: Increase the print quality mode If reprinting did not help, try increasing the print quality mode.
  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected, and then click Properties .
  3. Select the Paper/Quality tab.
  4. In the Print Quality area, choose the next higher quality setting. If the current setting is Draft, choose Normal. If the current setting is Normal, choose Best.
Step three: Print in grayscale (black area streaking only) If the streaks are in a black area of a black and white printout, change to grayscale printing. NOTE: This step does not apply to color printouts.
  1. In the application you are printing from, click File , and then click Print .
  2. Make sure the printer is selected and click Properties .
  3. Click the Color tab, and select Print Grayscale and High Quality .
Step four: Clean the printheads If the print quality is still bad, clean the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open HP Solution Center .
  3. Click Settings , Print Settings , and then select Printer Toolbox .
  4. Click the Service Tab .
  5. Click Clean Printhead , and then click Clean .
Step five: Align the printheads If the print quality is still bad, align the printheads.
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox , and select the Printer Services tab.
  3. Click Align Printheads . The Align Printheads window opens. Click Align .
  4. The printer prints an alignment page. The lines in the patterns should appear to be straight. Click OK when the page finishes printing.
Step six: Calibrate the linefeed If the print quality is still bad, calibrate the linefeed:
  1. Make sure the printer is loaded with unused white paper.
  2. Open the printer Toolbox and select the Printer Services tab.
  3. Click Calibrate Advanced Linefeed . The Advanced Linefeed Calibration window opens. Click OK .
Step seven: Replace one or both printheads If the print quality is still bad after performing all the above steps, one or both of the printheads will have to be replaced. Print a PQ Diagnostic page to see which printhead should be replaced.
  1. Make sure the printer is loaded with unused white paper.
  2. Press the Setup button.
  3. Press 1 and * simultaneously.
  4. Look at the color blocks labeled Test Pattern 2. Some or all of them could show white horizontal streaks. If none of the blocks are streaked, the printheads are okay.
    • If the Black block has lines – replace the KY printhead.
    • If the Cyan block has lines – replace the MC printhead.
    • If the Magenta block has lines – replace the MC printhead.
    • If the Red block has lines – replace the KY printhead.
    • If the Green block has lines – replace the KY printhead.

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HP officejet pro l7680 all in one


Most likely the print head has failed and the black is not printing which is causing the printer to have issues. Talk to HP as I guess printheads have warranty or simply change the yellow/black printhead. Or if all of these fail give the machine to HP to get you a new one as this is not right. I hope this helps.

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