Canon imageRUNNER ADVANCE C5000 Series Technical Workbook page 51

[Reference] To ensure that the toner supply mouth has been pushed in until it stops, check that the line [A]
on the pipe of the hopper unit (Bk) and the line [B] on the toner supply mouth are aligned with each other.
b-24) Remove the 3 screws of the hopper unit (Bk) to detach the plate of the gear [2].
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