Canon Perfect Binder A1 Troubleshooting Manual page 79

[Caution]
To install the Waste Paper Buffer Drive Unit, align the 2 bosses with the boss holes, and the positioning pins with the positioning
holes.
5) Removing Dust Buffer Unit
5-1) Remove the 2 screws.
5-2) Remove the fixing plate in the Trimming Assembly.
- Screw x2
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