Epson Stylus Color 900N User Manual page 101

Make sure the Media Type setting matches the paper you loaded. See page 76 for
guidelines.
Make sure the printable side of the paper is face up. It is usually the whiter or
shinier side of ink jet paper.
Make sure the ink cartridges aren't low on ink. If either ink out light is flashing,
replace the ink cartridge; see page 80. If your ink cartridge is more than six
months old, you may need to replace it; see page 83.
Try using Automatic mode. See page 62 (Windows) or page 65 (Macintosh) for
instructions.
Make sure the paper thickness lever is in the position, as shown to the right. Set
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the thickness lever to the position when you print on thicker paper or envelopes.
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If you see vertical banding . . .
Make sure the print head nozzles are not clogged. To clean the print head, see
page 77.
Run the Print Head Alignment utility. See page 85 for instructions.
Check the paper thickness lever position. If it's in the position, your printer is
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set for thicker paper or envelopes and your image may have banding.
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