We have a machine that throws this code E0020 whenever we try to either print or copy, so far ive tested bootle motor 5 on service mode-function-prtchk-motor 5 and it spins normally, after doing this the machine started printing and copying just fine.
However, trying to perform a test with function-install-toner-s always throws a NG message.
Developer assy actually has toner (from the motor 5 test i did maybe?), ive opened it up and cleaned the inside where the sensor is located, ive manually tried to open the hopper by pushing the small plastic tab and i could see toner falling down so theres nothing obstructing the way, also one time it gave an error E840 which is for the PSU fan failing, the i just turned it off and on again and it went away hasnt happened again since.
What else should i be testing to find the cause of this? i dont have another one here for a few days so i can swap the dev assy and see if that fixed the issue.
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