Canon imagePRESS 1135 Series Troubleshooting Manual page 229

<Work procedure 2-12>
17) Hold the grip, and pull out the Process Unit to the lock position.
・4 Screws
Process Unit
18) Check that the Process Unit can be smoothly pulled out and pushedback.
If it cannot be pushed back due to the Drum Shaft interfering with the drum, remove the Drum Drive Unit again
(see step 9) and install it again.
19) Secure the Process Unit [1].
・ 4 Screws [2]
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