What is the procedure for USB setup on a Macintosh?
Make sure the printer power switch is on, then double-click the Printer Driver Installer icon and follow the on-screen instructions. Connect the USB interface cable to your Macintosh and then to the printer. Open the Chooser from the Apple menu on the Macintosh, click the HL-1650/1670N icon to select it, and the setup will be complete.
From the official Brother HL-1650 Monochrome Laser Printer manual, page 2
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