Kyocera C7990 Error: Waste Toner Box Full Troubleshooting
Error code C7990 means the waste toner container is full or improperly seated. Open the printer cover, remove the full waste box, and…
Kyocera built its ECOSYS line around a drum that is designed to last the life of the machine rather than being replaced with the toner, which is why running costs on these are low and why the maintenance pattern is different. There is no drum unit to swap on most models: the toner cartridge holds only toner, and a Replace Drum style message that would be routine on another make is unusual here and worth reading carefully.
They are built for volume and are usually shared, so the common complaints are network ones. A Kyocera left on for months is a prime candidate for the address it was given having changed, and for the computer still sending to the old one. A configuration page from the panel settles that in under a minute.
Kyocera also exposes more settings than most makes, both on the panel and through its built-in web page, which is helpful when something needs adjusting and unhelpful when something has been adjusted by accident. If a machine has started behaving oddly with no other change, the web interface is worth opening before anything is dismantled.
Error code C7990 means the waste toner container is full or improperly seated. Open the printer cover, remove the full waste box, and…
The Kyocera C4200 laser scanner error means the polygon motor inside the laser scanning unit is failing to reach its working speed. This…
If the machine is under warranty or the fault looks like hardware, Kyocera's own support team can check it against your serial number.
Official Kyocera support