MX-3500N, MX-3501N, MX-4500N, MX-4501N (serv.man24). How to connect MX colour product to Linux UNIX systems using CUPS - Sharp Copying Equipment FAQ (repair manual). Page 5

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Sharp Electronics (UK) Ltd., Document Systems Support
2.  Add printer to CUPS
Open a web browser and enter 
http://localhost:631/
 into the address bar. This will take you to the CUPS main web
page on the local computer. Click on Manage Printer.
Select Add Printer.
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