Hello, I'm Wes, and I'll be assisting you today.
To replace the printhead, order a new printhead from HP using this link: http://support.hp.com/us-en/document/c01643079
Instructions to replace the printhead will come with the new parts.
Let me know if you need additional help so I can assist further.Also, please rate my answer below so based on your satisfaction.Thank you.
The instructions I have are in Step 2 in this link:
Try to repeat the steps in Step 2 to fix the issue.
I will open the question so other experts can help.
The printheads should be easy to replace on that model. They are stand alone things that just pop in like an ink cartridge. Its hard to believe that you did anything wrong doing it but i would suggest looking at the instructions and/or the video on this page and doing it again
Can i ask why you replaced them in the first place? and if you still have the old ones which you might try putting back in.
It seems likely to me that either the printheads you got are defective or there was a different problem with the printer in the first place that you thought replacing the printheads would fix.
You might also check the ink cartridges. Especially if the printer was sitting unused for a long time waiting for the printheads. If the ink dried up than it has none to work with on the printhead alignment.
One last silly thing is to check whether the printer has paper in it. I have seen alignments fail for that reason because it wants to print out an alignment page.
This seems to be the main though not the only cause for the alignment failing after replacing the print heads. It seems a common problem on that model.
I pulled these instructions from a tech page on the hp website.
The foam padding under the print head slide rail had lifted slightly catching the underside of the print head, which in turn causes the alignment to fail.
Open the printer top cover and using your fingers press the foam down as hard as you can. Do this for the entire length of the slide rail. Close the top cover and restart the print head alignment sequence.
this page also has a whole range of things to try
The one that i would recommend is to just do the alignment from the printer menu rather than letting it try after printing. For some reason i seem to recall that it can sometimes do that one but not the other one and once its done it will stop trying to do it after every page.
I think i am about to give up. We have tried everything i can find
the printheads may be bad or there may be another issue in the first place
have you got the original print heads ? You could try putting them back in and see if they can print the page
Once the page is printed you usually have to put it on the flat bed to scan so the printer can check its own alignment. But it doesnt look like it got that far.