E020 Error message on NP6050

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A E020 code is a toner amount problem in the developing ass'y. Is the copier asking for toner or was it and no toner was installed? If not the amount of toner is to low for the hopper to add enough toner in to over ride the toner sensor. Look in the developing ass'y for toner, if you only see about a 1/8' of toner you need to clean or replace the toner sensor. Then you are going to have to run in service mode " toner-s". Then rechk the amount of toner in the developer ass'y. It should be about a 1/2' or so. If not you have a problem with the toner hopper. And if that is the problem you may want to manually add toner in the developing ass'y to get the copier working again. You also have to clear the error code in service mode.