HP T 770 DOES NOT ACCEPT HEADS

[lelik19828]

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

[rubensanchez01]

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......

[D Hook]

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.

[lelik19828]

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