Check the network connection of the computer. See the documentation provided with the computer for
details.
The device connected to the USB 3.0 port causes radio frequency interference.
Solutions
When you connect a device to the USB 3.0 port on a Mac, radio frequency interference may occur. Try
the following if you cannot connect to wireless LAN (Wi-Fi) or if operations become unstable.
❏ Place the device that is connected to the USB 3.0 port further away from the computer.
❏ Connect to the SSID for the 5 GHz range.
See the following to connect the printer to the SSID.
& “Making Wi-Fi Settings by Entering the SSID and Password” on page 298
The printer has been connected by Ethernet using devices that support IEEE802.3az (Energy
Ecient Ethernet).
Solutions
When you connect the printer by Ethernet using devices that support IEEE802.3az (Energy Ecient
Ethernet), the following problems may occur depending on the hub or router that you are using.
❏ Connection becomes unstable, the printer is connected and disconnected again and again.
❏ Cannot connect to the printer.
❏
e
communication speed becomes slow.
Follow the steps below to disable IEEE802.3az for the printer and then connect.
1.
Remove the Ethernet cable connected to the computer and the printer.
2.
When IEEE802.3az for the computer is enabled, disable it.
See the documentation provided with the computer for details.
3.
Connect the computer and the printer with an Ethernet cable directly.
4.
On the printer, print a network connection report.
“Printing a Network Connection Report” on page 311
5.
Check the printer's IP address on the network connection report.
6.
On the computer, access Web Cong.
Launch a Web browser, and then enter the printer's IP address.
“Running Web Cong on a Web Browser” on page 374
7.
Select the Network Settings tab > Wired LAN.
8.
Select OFF for IEEE 802.3az.
9.
Click Next.
Solving Problems
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The Printer Does Not Work as Expected
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Cannot Print
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