I have been working to restore an older Epson 4900. When I received the unit all the tanks (Cone) were filled with piezoflush. The printer would only print three colors (pink stripes) on a ten-color purge page. I ran a number of cleanings, to no avail, and then took the head and selector assembly out of the unit and cleaned them thoroughly. I ran an ink charge and started getting better results. After several more #3 cleanings the 10-color purge page prints very well - there is no banding. If I print a single color purge page, it also prints well without any banding and I can do this on every color.
Here's the issue: The nozzle check only shows three colors printing, Y, LM and LC, and they are perfect. All the other colors are 100% missing. I would assume that if I still had clogging issues on the other seven channels (I don't think I do based on the purge pages) I would get squares with bad checks in them. I don't. The other positions are entirely missing.
Other than a 100% clogged head, which I know I don't have because I can print the purge pages, what would cause a nozzle check color to not print? Is there software in the printer that could be damaged? What about reloading or finding another version of the print driver? I should note that I get the same result whether I print from the print driver screen or from the printer's menu.
