Solution
1. Select the Print Command.
From an open document on an application, click [File] → [Print].
Select the printer icon for the machine ([Canon MF4200 Series UFRII LT]), then click [Preferences] or [Properties] to open the dialog box.
If you want to change the output size, click [Output Size], choose paper size which you set, and then click [OK].
NOTE
When <LOAD CORRECT PAPER> is displayed on the LCD, load the correct size paper as shown on the LCD, then press [OK] to resume the job. The machine re-starts printing.