How do I connect the HP LaserJet Enterprise M506 to a network?
Connect the network cable before turning on the printer, and note that the cable is not included with the printer. Do not connect a USB cable at the same time as the network cable during initial setup. For advanced network configuration, refer to the User Guide on the printer CD or visit www.hp.com/support/ljM506. (Page 3)
From the official HP LaserJet Enterprise M506 Printer manual, page 3
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