Canon imagePRESS 1135 Series Service Manual page 1438

4) When removing the drum home position detection flag, if the flag part is facing down, pay attention to the following points.
CAUTION :
Be careful not to displace the drum
home position detection sensor by
the flag part when removing and
make sure that the sensor does not
come off.
NOTE :
Check that the ITB pressure lever is disengaged as shown in the figure.
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Installation > Installation > Removing the transportation packing member of the process unit
9 Installation > Installation > Removing the transportation packing member of the process unit
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