Canon MF735C Series Service Manual page 349

5.
CAUTION:
Be sure to free the bosses while holding the joint
because the Cartridge Cover Retainer comes off
easily.
NOTE:
The bosses can be freed easily by pulling the Left Cover
in the [A] direction and pulling the Cartridge Cover
Retainer in the [B] direction.
[A]
[B]
6.
NOTE:
Release the claw while opening the Left Cover Unit in the
direction of the arrow.
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10. Installation