I have an FO-2080 that will keep undertoning about every 200 images.
It is used only for faxing so it is all print and no pictures.
The first time I replaced the toner cortridge thinking it was not adding toner properly or the toner density sensor was bad.(I also replaced the drum unit)
The next time I replaced the MCU PWB since the toner density sensor is read by it and the toner add motor is controlled by it.
I know the toner motor is good since I keep toning up the developer with simm 10 which runs the toner motor.
After toning up the developer I get good prints.
Machine has 12K images on it.
I have stopped the machine during the copy cycle and found no excess toner on the drum.
I have stopped the machine just after the copy cycle and found no toner on the drum.
There is no toner or developer accumulating in the machine.
HELP!!
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