Dell C1660w Color Laser Print User Manual page 51

4 Load print media on the PSI with the top edge first and with the recommended print side facing up.
5 Adjust the width guides until they rest lightly against the edges of the stack of print media.
6 Select the paper type from the printer driver if the loaded print media is not standard plain paper.
If a user-specified print media is loaded in the PSI, you must specify the paper size setting by using the printer
driver.
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Loading Paper