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There are two contact on the right wall off the printer cartridge chamber area. They can get pushed in causing the printer cartridge to not read correctly. Take a small Flathead screwdriver and bend them up so the cartridge ink level can be read.
We had the same problem with our mf6550 printing blank pages after we changed the toner cartridge. I called the support desk today and they said it is the shutter. They told me to remove the toner cartridge and then (without a cartridge in) close the door briskly. Then open the door, install the cartridge and again close the door briskly. It worked! He said it may be a permanent fix or it may act up again. He also said I could take it to a service center to have it fixed permanently. The service desk # is 1-800-828-4040. They can tell you where the nearest service center is. Good luck.