• ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
  • ×
    Information
    Windows update impacting certain printer icons and names. Microsoft is working on a solution.
    Click here to learn more
    Information
    Need Windows 11 help?
    Check documents on compatibility, FAQs, upgrade information and available fixes.
    Windows 11 Support Center.
  • post a message
Guidelines
Do you need to install your printer? Click here for tips and tricks!
Get help with Large Format Printers, with direct access to all Large Format Knowledge Center· Ask anything · Find anything · Share anything at HP LKC
HP Recommended
hp t770
Microsoft Windows 7 (64-bit)

The printer was working finished printing, I turned it off in the morning turned it on, it showed that the print head needs to be replaced. I tried to reinstall it, he completed the installation and wrote ready to work. Replace the print head when trying to print again. I tried to reinstall the head again, but it no longer entered the installation mode, the hours were spinning for about 5 minutes and it showed error 79.03. I updated the firmware to the latest version, bought a new head and installed it. The printer starts checking the heads and immediately returns the heads on write replace the head. I did a test carriage assembly while trying to test the printer knocked out 79.04

3 REPLIES 3
HP Recommended

most likely  inktube has air bubbles.

 

Use a syringe to draw out air & see  what happen....
(   myself created a special tool with an old broken #70 printhead with 2 flexible 4mm plastic tube, then super glued to the printhead & use it to draw out air or clog inktube etc )

 

Myself always had this problems on Z3200, Z3100, Z2100  etc & I always fixed the  problems......

HP Recommended

Are any of the ink cartridges low?  The ink levels need to be above 25% or so for the printhead replacement to complete the process.  If any of them are too low, it won't complete the replacement process.

I don't work for HP....I just repair their printers.
HP Recommended

I have cartridges with an auto reset chip. Shows that they are full

† The opinions expressed above are the personal opinions of the authors, not of HP. By using this site, you accept the <a href="https://www8.hp.com/us/en/terms-of-use.html" class="udrlinesmall">Terms of Use</a> and <a href="/t5/custom/page/page-id/hp.rulespage" class="udrlinesmall"> Rules of Participation</a>.