Canon IPF 4000 – error code EC21-2F51
The plotter is displaying error code EC21-2F51.
How the printer was repaired:
Customer had a new printhead available and had already replaced the maintenance cartridge himself. The ink was empty, so I had him replace that, to get further in the process but the error still occurred. Booted into service mode where finally it asked for the printhead to be replaced. I replaced printhead and the print diagnostics passed. Downloaded firmware update and loaded to Canon from 1.16 to 2.11. Had user test all apps for print. Maintenance Cartridge showed a better % of remaining after the firmware was updated.