Canon 4496B008AA Advanced Manual page 347

Pull out the Disc Tray gently.
If the Disc Tray cannot be pulled out, turn the printer off, then turn the printer 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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