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‎04-03-2021 04:13 AM - last edited on ‎05-19-2021 07:50 AM by Retired

HP Recommended
Product: hp t770
Operating System: 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

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3 REPLIES 3

‎04-03-2021 06:22 AM

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......

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‎04-03-2021 12:09 PM

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.
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‎04-07-2021 11:07 AM

HP Recommended

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

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