MPS6500b User’s Guide> 43NOTE> If there are no paper trays that match the automatic trayselection, an error message prompting for replenishmentof paper will be displayed. You can configure the printernot to display this message but to automatically select anearest or larger paper size of the document for printing.(Substitute Tray)> If paper runs out during printing, a paper tray containingpaper of the same size and orientation of the paper usedfor printing will be selected to continue printing(automatic tray switching).> If there are no paper trays that match the paper typesthat are set for [Specify Paper Type], a messageprompting to confirm printing on another paper type willbe displayed. Press the button to printon paper of another type or press to cancelthe job.Refer to:• Specify Paper Type: Online Help for the printer driverSetting Custom Paper SizesTo print on custom size paper loaded in trays 1 to 4, you must setthe paper size on the control panel.You may also need to set it on the printer driver, depending on thepaper size.This section explains how to set the size on the control panel.Important:• When setting the paper size on the printer driver and controlpanel, be sure to specify the same size as the actual paperused. Setting the wrong size for printing will cause machinefailure. This is especially true if you configure a bigger sizewhen using a narrow width paper.NOTE> To return to standard paper size settings, select [Auto] instep below. This printer will automatically detect the sizeand orientation of the loaded paper.1. Press the