These are NOT sensors. These are just plastic pins. There are 3 sensors on the assembly side faced ITB.How cleaning plastic pins can improve picture quality?
Hope somebody solve this issue by now.I have MF8580 with has about 3mm! color mismatch. It gives "Correct Print Color Mismatch fails". Cleaning sensors did nom make any difference. Another printer is MF8350. Same, just older model shows correction do...