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Hi Robert, If you send a print job to the WF-7840 and a messages pops up on your Windows computer saying the printer is out of black ink, cancel the print, then open the printer driver settings menu, select Black/Grayscale and resend the print job. Printing with one or more expended color cartridges works with plain paper and envelopes. Instructions for Macs are in the WF-7840s user's guide. We recommend replacing expended cartridges as soon as possible to prevent ink drying around the nozzles and potentially damaging the print head. Regards, Mark - The Epson Team.
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