Canon Color ImageRunner C3380 Reference Manual page 392

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Finisher-Y1/Saddle Finisher-Y2/Puncher Unit-M1 (Optional)
Return the punch waste tray to its original position.
NOTE
If the punch waste tray is not securely in place, you cannot make prints in the Hole
Punch mode.
Close the front cover of the punch waste tray.
CAUTION
When closing the front cover of the punch waste tray, be careful not to get
your fingers caught, as this may result in personal injury.