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BugZero found this defect 114 days ago.
When it is time to replace the waste toner container, the printer message appears on the control panel. To replace the waste toner container: WARNING : Do not perform this procedure when the printer is copying or printing. At the front-side of the printer, open Door A Then, open Door B at the right-side of the printer. Unlock and remove the waste toner container from the printer. Unpack and insert the new waste container. Close Door B, as shown. Close Door B and Door A, completely.