Canon imagePRESS 1135 Series Troubleshooting Manual page 154

<Work procedure 2-5>
8) Check for any foreign matters on the Developing Cylinder Drive Gear [1], and remove them if any.
CAUTION:
Do not rotate the Developing Cylinder Drive Gear [1].
Reason: Before the Developing Sleeve Unit separates from the Developing Assembly, the Developing
Cylinder Drive Gear [1] cannot be rotated manually.
Caution :
The screw is non-magnetic, so be careful not to drop it when installing/removing it.
9) Remove the developing cylinder upper cover.
-3 screws
10) Remove the torsion spring.
-2 pins
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