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Have you recently changed any network settings or Router?
If no, try the instructions below.
Then, click the + (plus sign that you see on the print & scan window, and not on the keyboard) sign to add printer. Select your printer from the list.
Note : Make sure that you are resetting the printing system before adding the printer.
If you are still not able to detect the printer, you have to setup wireless again on the printer. In order to setup wireless, follow the instructions in the document below.
After setting up wireless, try adding the printer.
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