Have you replaced the developer and drum. If you have did you clear the counters first! Machine works on the information the counters provide if you put new stuff in the machine and do not clear the counters first, the machine works and say's I have old stuff in me increase/decrease as required certain voltages, when you really have new stuff in there copy quality issues and codes. IF you did do it correctly the sensor below the image unit mite be bad, worse case the board the sensor feeds is bad. Once the developer was replaced did you run F8 in service mode. Also does the control panel say replace PC drum then you need new developer and PC drum.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
Answers & Comments
Have you replaced the developer and drum. If you have did you clear the counters first! Machine works on the information the counters provide if you put new stuff in the machine and do not clear the counters first, the machine works and say's I have old stuff in me increase/decrease as required certain voltages, when you really have new stuff in there copy quality issues and codes. IF you did do it correctly the sensor below the image unit mite be bad, worse case the board the sensor feeds is bad. Once the developer was replaced did you run F8 in service mode. Also does the control panel say replace PC drum then you need new developer and PC drum.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f