Tech Help — Designjet T790

Question: "Hi,I recently did my second belt replacement on my T1100 (both belts from LPS as they appear to be the only ones with the guide ribs). The first time everything went well. This time, the machine keeps insisting on a printhead replacement.I've tried the printhead recovery kit (and changed printheads), and ink readily flows through the tubing into the printhead carousel. But the system keeps failing the first printhead, telling me to reseat/replace it. I do this, it moves to the service station, and fails again. Is there anything else I could have mis-reconnected? the cable and ink tubes...

This problem occurs in the following Designjet models: T610, T620, T770, T790, T1100, T1120, T1200, T1300, T2300, Z2100, Z3100, Z3200, Z5200, Z5400.  Your printer is in the middle of "preparing print system," and after 20 minutes of waiting, it displays the message "printhead replacement incomplete." You power the machine down, and back on, and it still tells you "printhead replacement incomplete." Very often, this is caused by insufficient ink supply. If you are using non-HP brand ink cartridges, install new HP cartridges. If any of the ink cartridges is below 40% full, replace that cartridge.  If there are any pockets...