Canon imagePRESS C850 Series Troubleshooting Manual page 63

7) Remove the 2 screws [1] on the underside of the operation tray assembly, and remove the back end assist motor unit [2].
8) Remove the 1 screw [1] located in the direction of the trailing edge of the operation tray assembly.
9) Remove the 3 screws [1] on the underside of the operation tray assembly, and remove the guide assembly [2].
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