Canon imagePRESS 1135 Series Troubleshooting Manual page 164

<Work procedure 2-5>
14) Open the Front Left Cover and the Front Right Cover.
15) Remove Process Unit Cover.
16) Pull Out primary Charging Assembly
17) Pull Out Process Unit.
18) Remove Drum Cleaning Unit
19) Cover the drum with paper to block light.
Procedure for Adding a Process Unit Washer
20) Remove the screw [1] on the rear side of the Process Unit.
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