Canon imagePRESS C800 Series Troubleshooting Manual page 66

Chapter 1
2) Wait for a few seconds until the stapler unit stops moving, and then open the front cover of the finisher.
If the staple case is difficult to be pull out as the stapler unit is located at the back, close the front cover of the finisher and wait for a few seconds until the stapler
unit stops moving.
3) Pull out the staple case.
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