Just had this problem myself and fixed it as follows: Take out the photo conductor unit(PCU). Clean the inside of the printer, just dust up excess ink laying around, gently with a dry paper towel.
OK, on the PCU there is a wide black rubber band sort of thing... it's as wide as the drum(blue film) on the PCU. If you were to rotate the drum so the rubber band revolved one full time, eventually you would see a small silver square on the rubber band. Gently clean that off.
As you are facing the front of the printer, the PCU inserts with the silver square on the rubber band, on your left. If you look down into the printer, there is a corresponding sensor for that sliver square. The sensor is also silver...it's about 1/2 inch by 1 inch. Clean this. Doing so solved my problem.
Mine was coverd in black ink.. once I wiped it clean and put the PCU back in, it worked fine.
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