What do the different WiFi light indicators mean on the DCP-B7500D?
When the WiFi light is on, your Brother machine is connected to a wireless access point. When the WiFi light blinks, the wireless connection is down or your machine is in the process of connecting to a wireless access point. To set up a wireless connection, press the WiFi button and launch the wireless installer on your computer, then follow the on-screen instructions. (Page 8)
From the official Brother DCP-B7500D Monochrome Laser Multifunction Printer manual, page 8
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