Blocked printhead

[Henry191]

I believe I have a blocked print head as I’ve got white lines on my Cyan test prints and despite cleaning the printhead through the printer or online with the deep cleaning it is ineffective. 
The printer is out of warranty so no one seems to want to help. How can I fix this, is there somewhere I can get a replacement print head from or what? 

[Nal_NR]

Hi @Henry191,

Welcome to the HP Support Community

I understand you are facing a print quality issue with your HP OfficeJet Pro 8024 All-In-One Printer. Not to worry I will help you to get a resolution to resolve the issue.

To assist better:

• Are you using genuine HP ink cartridges?
• Does the copy print out the same way? 
• What's the application you are trying to print from? 
• Have you tried printing from a different application or device? 

While you respond to that, let's print a Print Quality Diagnostic page -Post the Print Quality Diagnostic page here so we can help you further.

Let's perform a power drain: 

• With the printer turned on, disconnect the power cord from the rear of the printer and also unplug the power cord from the wall outlet.
• Remove the USB cable, if present.
• Wait for 2-3 minutes, press and hold the power button on your printer for about 30 seconds to remove any additional charge.
• Now plug back the power cable straight to a wall outlet without any surge protector or an extension cord (This is important) and then plug back the power cord to the printer.
• Turn on the printer and wait till the warm-up period finishes and the printer is idle.

Update the printer firmware 

• Click here to download and install the latest printer firmware from your product
• Click here to know different methods of updating the printer firmware. 
• follow the troubleshooting steps from this document. 

Hope this helps! Keep me posted for further assistance.

Please click “Accepted Solution” if you feel my post solved your issue, it will help others find the solution. Click the “Kudos/Thumbs Up" on the bottom right to say “Thanks” for helping!

[Henry191]

In reply to your earlier message:

Ink is supplied via the HP Instant Ink service so is genuine ink 

The results are the same wether printing or copying 

I am mostly printing from an iPad via AirPrint but do use the HP Smart app to print as well and a MacBook all of which yield the same result. 

I have performed the power drain and updated the software to the latest available and nothing has changed. 
I have carried out multiple deep printhead cleans all of which yield the same result. I now have hundreds of these print test pages all of which are similar in results. 
The attached photo is of the test sheet from the last deep printhead clean I have performed just now, as you can see there is still a problem with the printhead. 

Please advise where we go from here 

Many Thanks 

[Nal_NR]

Hi @Henry191 ,

We are sorry that the issue is not resolved when the above troubleshooting steps were performed.

This might require one-on-one interaction to fix the issue via remote assistance. 

I've sent you a private message with further instructions. In order to access your private messages, click the private message icon on the upper right corner of your HP Support Community profile, next to your profile Name or simply click on this link.

If the information I've provided was helpful, give us some reinforcement by clicking the Accepted Solution button, that'll help us and others see that we've got the answers!