Canon imageRUNNER ADVANCE C5000 Series Technical Workbook page 64

2) With the toner mouth [a] rotated and held until it pushes against the stop, be sure that the 3 bosses [2]
and 1 hook [3] of the hopper unit (Bk) [1] are fully inserted before tightening the screws in the order of [4], [5]
and [6].
[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.
c-26) Remove the 2 screws [1] and 1 boss [2]. Pull out of the hopper shield [3] while opening the top.
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