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Kelvin Kiprono
Hardware & Printhead Tech
Eldoret (Uganda Rd)
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Sep 02, 2026 at 8:04 AM
Solved
Kyocera TASKalfa 1800 / 2200 showing error C7990 (Waste Toner Box Full) after emptying box
We emptied and thoroughly cleaned the plastic waste toner box on our Kyocera 1800 heavy photocopier, but the screen continues to flash error code `C7990`. Is there a maintenance simulation code to clear the optical sensor lock?
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Kyocera TASKalfa 1800 / 2200 showing error C7990 (Waste Toner Box Full) after emptying box
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