If you replaced the developer unit then you already replaced the ATDC sensor. using third party toner or KMBS? if so use only KMBS Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
google you tube video and find how to scan to my computer from bizhub c220. do you know how to use pagescope the copiers web page system? Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f