Canon imageRUNNER ADVANCE C5000 Series Technical Workbook page 222

[Caution] When installing the drum drive unit (Bk), go through the following steps so
that no gap is found with the main body's rear side plate.
1) Install the drum drive unit (Bk) and temporarily tighten the 2 screws.
2) Install the flywheel fixing with the 3 screws.
3) Hold the 2 levers of the process unit inner cover and lift up the levers and
process unit inner cover to the horizontal level.
4) While keeping the levers horizontally, push the process unit inner cover to
the rear side. Then, push on the 2 stopper plates [A] of the right and left
hooks of the process unit inner cover to the end faces [B] of the hinge shaft
holder at the right and left sides on the main body. If the process unit inner
cover is pushed to the rear side without keeping the levers horizontally, the 2
stopper plates [A] of the hooks run over the inside of the hinge shaft holder
at the right and left sides on the main body, which may cause the release
arm inside the process unit inner cover to get damaged.
5) Raise the levers at a 90-degree angle further and close the process unit
inner cover. The 2 hooks (right and left) of the process unit inner cover are
hooked to the hinge shaft at the right and left sides of the main body to lock.
6) Install the front inner handle cover L [1] and the front inner handle cover R
[2] in the direction of the arrow and tighten the screw [3] respectively.
BK
4