Canon Perfect Binder A1 Troubleshooting Manual page 108

2-33) Remove the 4 screws and remove the metal plate unit.
2-34) Remove the 4 screws [1] fixing the Shutter unit. Then, pull the Shutter unit in the direction of arrow.
2-35) Pull the Shutter unit [1] from the left side of the machine. The below photo shows the appearance of the machine from its
back to its left side.
106