The paper type you load in the printer' should match the paper type set in your print dialog box.
Here's how to change paper settings from a Mac®.
Change the paper type
Confirm that the cable is connected and the printer is powered ON before you continue.
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From the File menu, select Print to open the Print dialog box.
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Select your printer model from the Printer drop-down. The screen you see will differ depending on your version of Mac OS X®.
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Select Quality & Media from the drop-down in the middle of the screen.
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From the Media Type drop-down, select the paper type you will use to print.
Your paper choices may differ depending on your printer model.
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Select Print to start your print task.