Message Error call service 7980 on Kyocera printers

This error code appears on these printes:

• FS-1116MFP, FS-1118MFP, FS-1016MFP, FS-118MFP, KM-1815, CS-1820...

Cause: 

•  Waste toner tank overflow
• If the bottle is not full then the sensor thinks it is

Solution:

• Clean the sensor
• Replace waste toner tank

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