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This function is available for SP C340DN only.
On the warning screen, press [Change], and then select setting items using the [
] or [
] key.
Select the tray whose paper size setting you want to change 
Press [OK]
Select the paper size you want to set Press [OK]
Select the tray whose paper type you want to change Press [OK]
Select the paper type you require Press [OK]
Press the [Escape] key.
