Looks like a defective drum unit. Take out the drum with toner and look at the shiny (usually) green cylinder on the bottom. If it's constantly covered with toner, it means that either it got dirty from something or the silicone gasket strip that removes the toner from it is "leaking".
Remember that the green drum is very delicate and should not be exposed to light for a prolonged time. If you want to try and clean it, use the softest cloth or tissue you can find, dampened slightly in isopropyl alcohol, and use very delicate stroking motion, applying nearly no pressure.
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