I have a Officejet L7780, and it is saying I have a printhead problem-black / yellow

[wpburch]

The printhead has been replace at least 2 times- is there a fix for this??

[DevRao]

Hi,

Please follow the troubleshooting steps mentioned in the following link.

http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01628836&cc=us&dlc=en&lc=en&product=2512010&tmp...

[MWILSON00]

Hello!

Usually after there is a print head replacement and it doesn't fix the issue that means that there is a problem with the printer itself.

[BenAM]

Hi wpburch!

Here are some troubleshooting steps to try:

Step one: Perform a power reset

Follow these steps to reset the product. Make sure you connect the product directly to a wall outlet and not a surge protector or power strip.

1. Press the Power button ( ) to turn off the product.
   

   NOTE:The product might not turn off after pressing the Power button. Continue to the next step regardless.
2. Disconnect the power cord from the rear of the product.
3. Unplug the power cord from the electrical outlet.
4. Wait 30 seconds.
5. Replug the power cord into the electrical outlet.
6. Reconnect the power cord to the rear of the product.
7. Press the Power button ( ) to turn on the product.

• If these steps resolved the issue , there is no need to continue troubleshooting.

• If the issue persists , see the next step.

Step two: Clean the electrical contacts on the printhead and inside the product

The ink nozzles on the printheads might clog if you expose them to air for more than a few minutes. The ink nozzles also might clog if you do not use the product for long periods of time. Follow these steps to clean the electrical contacts on the printheads.

CAUTION:Follow these steps carefully to avoid damaging the sensitive electrical components.

1. Make sure that the product is turned on.
2. Open the top cover of the product.
3. Press and hold the OK button for five seconds. The carriage moves to the left side of the product. Release the OK button.
4. Wait until the carriage is idle and silent.
5. Unplug the product power cord from the electrical outlet.
   

   NOTE:Do not turn the product off by pressing the Power button ( ). This causes the carriage to move out of reach.
6. Lift the printhead latch.
   Figure 1: Lift the printhead latch

   
7. Lift the handle on the printhead that the error message indicates is missing or damaged, and then pull the printhead out of its slot.
   Figure 2: Lift the handle and remove the printhead

   
8. Use a dry, soft, lint-free cloth to remove any ink from the electrical contacts on the printhead.
   

   CAUTION:Wipe only the electrical contacts. Wiping the ink nozzles, located on the underside of the printhead, can damage the printhead.Do not touch the nozzles. Doing so permanently damages the ink nozzles, and the ink stains clothing.
   Figure 3: Electrical contacts and ink nozzles

   

   1 - Electrical contacts

   2 - Ink nozzles
9. Wipe the electrical contacts with the swab until no ink residue remains.
10. Wipe the electrical contacts with a fresh cloth to dry them and remove lint.
11. After the electrical contacts on the printhead are clean and dry, place the printhead on a sheet of paper or a paper towel. Make sure that the ink nozzles face up and do not touch the paper.
12. Use a fresh, dry, soft, lint-free cloth to clean the electrical contacts inside the product.
    Figure 4: Clean the electrical contacts inside the product

    
13. Allow at least five minutes for the contacts to dry. Check the contacts for lint or debris, and then dry or clean the contacts again if needed.
14. Plug the product power cord into the electrical outlet.
15. Press the Power button ( ) to turn on the product. 'Printhead missing or damaged, replace the printhead' displays on the control panel.
16. Insert the printhead into its color-coded slot. Press down firmly on the printhead to make sure the electrical contacts touch.
17. Pull the printhead latch all the way forward, and then press down to engage the latch.
    

    NOTE:You might have to press firmly to engage the latch.
    If the error message indicates that both printheads are missing or damaged, repeat the steps in this procedure to clean the other printhead.
18. Close the top cover of the product. The product restarts and then prints an alignment page.

(Note: Steps taken from document http://h10025.www1.hp.com/ewfrf/wc/document?docname=c01628836&cc=us&dlc=en&lc=en&product=2512010&tmp...)

Let me know if these steps resolve the issue! If they do not, the unit likely needs to be serviced or replaced.

[DevRao]

Hi,

Please perform reset on the printer without printhead and cartridges. The steps are mentioned below,

• Unplug the power cord from the HP All-in-One.
• Wait for 20 seconds.
• Press and hold # and 6 while plugging in the power cord to the HP All-in-One.
• Release the buttons after the HP All-in-One starts up.
• The HP All-in-One will now be reset to factory defaults.

NOTE: This reset will clear the following and will be set to factory defaults.

_ All user menu settings to default
– All telephony parameter values to default
– Initiate select country and language UI
– Clear fax memory
– Clear fax journal information
– Clear all speed dials/broadcast lists
– Clear personal header information
– Instant Share Settings
– Wireless Settings Cleared

[wpburch]

I cleaned the head, and the insert area, and also did the reset with the printheads out and the ink cartridges out

Still the same problem

[wpburch]

Is this fixable??

[MWILSON00]

Hello!!

This now sounds like a sensor has gone bad in the print head, within the printer itself, the best solution is replacement or a new printer, unfortunately this is not a replaceable part of the printer.

[wpburch]

If this part is not replacable - sounds like I need a new printer????

This is disappointing due to the fact I paid $449.00 for the printer back in 2007 and has a problem with this

while under warranty, and I was sent a new printhead. It looks like this was a deeper problem that HP maybe knew about, and ignored. I certianly don't want this to happen to me again - I have a 7410xi that is way older and it work fine.