Tech Help — Designjet T620

"Printhead replacement incomplete" after "preparing print system" on a T610, T620, T770, T790, T1100, T1120, T1200, T1300, T2300, Z2100, Z3100, Z3200, Z5200 or Z5400? This is usually not enough ink reaching the printheads: a non-HP cartridge, a cartridge below 40% full, or air in the ink tubes. Install HP cartridges above 40% full and purge each ink line with the priming tool. If the tube system is compromised, the seal upgrade kit is the easier and cheaper fix. Parts you may need: Universal Designjet ink tube priming tool | Printhead seal upgrade kit for T and Z models | HP... Read more →

This problem occurs in the following HP Designjet models: T610, T620, T770, T790, T1100, T1120, T1200, T1300, T2300, Z2100, Z3100, Z3200, Z5200, Z5400.  If your printer is rejecting HP 70 printheads or HP 72 printheads, or if the printheads seem generally unreliable, there's a good chance there's nothing wrong with the printheads themselves. Often the contacts on the trailing cable corrode, and fail to send a consistent signal to and from the printheads. If you're on your second or third replacement printhead, and about ready to put some creatively-placed holes in the printer, power the machine off, and check the... Read more →