Canon Perfect Binder A1 Troubleshooting Manual page 38

[Service work]
If the above-mentioned symptom occurs, check the trimming blade.
If the trimming blade is found to be nicked, prepare the new cutter unit (4Y8-3057-000), the reinforcement kit (4Y8-3099-000)
and the super lube grease (FY9-6005-000). And replace the trimming blade and attach the reinforcement kit by following the
procedures.
a) Replacing the trimming blade
Replace the trimming blade with the new one by following the Service Manual.
b) Installing the reinforcement kit
1) Drawing Out the Trimming Assembly
1-1) Insert the blade of a small-size screwdriver, and then turn it in the direction of the arrow to unlock the stacking assembly.
1-2) Move to the front of the machine, and then remove the front covers (left/right).
1-3) 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) .
1-4) Remove the front cover (right) in the same manner as above.
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