Kyocera C7990 Waste Toner Box Full
What it means
The waste toner container is full or is not fitted. It is one of the easier codes to deal with: fit a new container, or refit the existing one properly, and the printer carries on. Do not empty and reuse the container, since the sensor and the seal are part of it.
Guides that cover this kind of fault
A guide written for C7990 itself is still being checked against the manufacturer's documentation. These cover the same underlying problem and are filed under maintenance.
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Common questions
What does the C7990 error mean on a Kyocera printer?
The waste toner container is full or is not fitted. It is one of the easier codes to deal with: fit a new container, or refit the existing one properly, and the printer carries on. Do not empty and reuse the container, since the sensor and the seal are part of it.
Is the C7990 error serious?
Not usually. Codes at this level normally clear once the condition they describe is dealt with, and a printer that carries on working afterwards has nothing further wrong with it.
Different code or problem?
Switch off and unplug a printer before reaching inside it. If a fault involves the power supply or internal electronics, or the machine is under warranty, contact the manufacturer or a qualified technician. Full disclaimer. Brand and code names are trademarks of their owners; PrinterFixUp is independent and unaffiliated.