I had this situation. While cleaning the printer from the toner, a cloud of this toner itself rose. And after that the printer gives an error message 320-061. the drums changed, the engine turns 5 seconds and an error appears. Can you tell which sensor is clogged or something else?
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061-320 it is ROS (laser) error. Maybe in the process of cleaning some amount of toner migrate to or into the Laser module. Also it is possible to have a defective Laser. The ROS is accesible on the right side of the macnine. Remove the right side cover, remove the HVPS (high voltage power supply, remove the inside metal cover and after that you will see the Laser. It is hold by 2 screws. Remove it and take out the Laser covers (left, right and upper) and clean it well with a dry cloth but with care becuase the unit is very sensitive. It will be better to have a tech for this procedure.
1Not sure. But for the mesage with R6 and R7 theer is an NVM value 745-060 that must set from "1" to "0" and for the masege for missing toners check the toner CRUM PWB's to not be bent or covered with toner.