Canon Perfect Binder A1 Troubleshooting Manual page 166

2) Replacement of shutter
2-1) Open the front covers (left/light).
2-2) While holding the front cover (left) with one hand and pressing the black lever with the other hand, pull the hinge in the
direction of the arrow to remove it. After removing the upper and lower hinges, remove the front cover (left).
2-3) Remove the front cover (right) in the same manner as above.
2-4) Remove the rear cover.
- 6 screws
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