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Sorry for the wait. My name is Michael. I will be helping you with your question today.
This error means that thd Toner concentration of the developer material is too high.
The first thing I would suggest is using Xerox consumables. Not doing so is the primary cause of this and similar errors. If you are using OEM consumables, the following parts should be checked and replaced if necessary.Cartridge drive motor(A22MOT1)Cartridge home sensor(A22Q2)Toner sensor (A22Q1)Main PWB (A3)
I can provide you with a copy of the service manual if it is something you would find useful for troubleshooting in more depth. Just let me know.