Greeting guys! i have an issue with HP laser-jet colour m855 printer. it was recently brought in my workshop cause of 59.07.00.
I logged a case with HP and they advised and gave me a series of steps to follow, and after trying the steps which hp gave the issue still could not be resolved. so i opened the machine up and found a sensor which was not seated properly in its position. I put back in its placed then powered the printer up and the error disappeared. then i tried to print a demo page and print were just blue colour, at this point i thought the DC was faulty and so I replaced it with the new one and tried to print a demo page again, then print came out in black colour only.
HP recommended series of parts to be replaced but nothing changed and now the print can only print yellow.
i changed the scanners, dc, power supply both high and low voltage, changed toner, drums, ITB, transfer roller, updated the firmware and other parts still this issue hasn't been resolved.