Waste Toner Light won't go off?

The waste toner is usually a bottle near the toner cartridge which collects excess toner powder from the cartridge. It is usually present in more heavy duty laser printers, not all printers have them as a replaceable supply. You would need to refer to your manual for replacement instructions, they vary from printer model. For this machine, the Waste Toner supply number is #420131. In the case of the first poster, my best guess would be there was spillage of toner on the sensors to detect the waste basket overflowing, hence why the error message is constant. This would require cleaning of the sensors, a relatively simple task but for proper access, the machine would need to be partially disassembles for thorough cleaning. It would be best done at a repair centre.

If I remember correctly, this model uses a LED to transmit a light through a little section of the empty toner cart. Its a little square area and should be located on the backside of the empty toner cart. you will see the sensor that it slides into. Make sure this area is clean.If this area is dirty you will still have a error light.