A few things could be wrong.
1. Check if the toner is not bad, all hard as a rock. If so replace it
2. Check to see if the toner bottle isn't dammaged. If so replace it.
3. The toner auger is clogged? Vacuum the whole toner hopper out so it empty then add a fresh new toner. If it adds toner you will know. If it doesn't then the ring the toner bottle sits in is siezed. Remove it and clean throughly.
3. If all that seems good your going to hafta get a new hopper unit.
The bottle only rotates when the machine determines a low toner state in the developer unit. If the bottle does not rotate when the hopper motor is turned on then there could be a defect in the bottle (you would probably hear a loud noise) or the bottle drive has failed. In some cases a small gear on the drive pack is broken.
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