Please check the following points:

• Are the paper guides in the paper tray set correctly?
  In the paper tray, set the side and end guides to their correct positions.

• Is the paper guide in the multi-purpose tray set at the correct mark?
  Set the paper guide in the multi-purpose tray at the correct mark.

• Did you install the A5 spacer when loading A5 paper into the paper tray?
  Make sure that the A5 spacer is properly installed next to the end guide in the paper tray.
  To see how to use the A5 spacer, click here.