Here is what the manual says:Accumulator belt out of position.
1. Is the imaging unit at the end of its life?
2. Is there toner on the accumulator belt cleaning blade holder? (The
holder is located on the imaging unit, along the bottom of the green
OPC belt.)
3. Check to see if any toner cartridges are leaking toner.
4. Ensure that the imaging unit is properly installed and locked in place.
5. Inspect and clean the transparent plastic cover over the accumulator
belt position sensor. This sensor is located on the interior of the back
wall of the chassis.
6. Inspect the wiring harnesses leading in and out of the charger
sensor board.
7. Replace the imaging unit.
8. Replace the engine control board.
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