Canon iR4570 Series Service Manual page 662

Chapter 12
2) Secure the drum unit in place using a screw (M5) [1].
3) Put the developing unit in the machine.
3-1) Place segment A of the developing assembly on segment B of the developing assembly rail.
3-2) By sliding the base [2] of the developing assembly [1] along the developing assembly rail [3], fit the assembly
in place inside the machine.
4) Connect the connector [1], and push the developing assembly [2] all the way in.
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