Canon MG8100 series On-Screen Manual page 847

check box prevents the Disc Tray from getting dirty.
Disc Tray Jammed
Pull out the Disc Tray gently.
If the Disc Tray cannot be pulled out, turn the machine off, then turn the machine back on again.
The Disc Tray will automatically be ejected.
When the Disc Tray is pulled out, place the Disc Tray ("G" is on the upper side) again, then retry
printing. Place the printable disc properly.
Attaching/Removing the Disc Tray
If the Disc Tray is still jammed, check if there is a problem with the printable disc.
Disc Tray Does Not Feed Properly
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