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How do you connect the printer to the computer? Using USB cable?
S H E F I N
Have you recently changed any wireless settings or router?
Please try the following and let me know the response.
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.
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If so, you have to setup wireless once again on your printer. Follow the instructions in the link below.
After setting up wireless, reset the printing system again and add the printer.