I am getting a error code P-9, P-21, P-28
P-9 Replace the black developer and drum unit.
P-28 Have tech clean the IDC sensor located under the transfer belt forward section (right side of the copier) the rear one towards back of the machine right side There are two clean both
Above two codes should then fix P-21 which is the fault that registration is not right. And Since the Black Image unit is the reference for the other three color in regards to Registration that is why P-9 and P-28 need fix first.
Btw, I’m available to help over the phone in case u need at https://www.6ya.com/expert/normanj_7893313f0751935f
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