Canon Perfect Binder A1 Troubleshooting Manual page 226

5) Remove the 1 screw [1], and remove the cable arm [2] from the trimming assembly.
6) Remove the 6 screws [1], and remove the trimming assembly.
[Reference] Marking the screw holes where the screws were attached with a permanent marker etc. will be helpful to find the
place to attach them later.
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