What should I do if the WiFi indicator light is off after setting up the wireless connection?
If the WiFi indicator light is off, you may have selected an incorrect network name (SSID) or entered the wrong password. Repeat the wireless setup steps to try again, making sure to correctly enter any uppercase or lowercase letters in the password. (Page 27)
From the official Epson WorkForce Pro WF-7510 All-in-One Printer manual, page 27
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