Canon MB5400 Series Online Manual page 886

Place the wireless router and printer where there are no obstacles between them. Wireless communication
between different rooms or floors is generally poor. Wireless communication can be impeded by building
materials containing metal or concrete. If the printer cannot communicate with the computer over a wireless LAN
due to a wall, place the printer and the computer in the same room.
In addition, if a device like a microwave oven that emits radio waves of the same frequency bandwidth as a
wireless router is nearby, it may cause interference. Place the wireless router as far away from interference
sources as possible.
Make sure wireless signal is strong. Monitor signal status and move printer and
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wireless router as necessary.
To check the radio status,
• For Windows:
Checking Wireless Network Status
• For Mac OS:
Monitoring Wireless Network Status
Make sure the computer is connected to the wireless router.
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For more on how to check the computer settings or connection status, see your computer instruction manual or
contact its manufacturer.
Make sure Enable bidirectional support is selected in the Ports sheet of the
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properties dialog box of the printer driver. (Windows)
Make sure security software's firewall is off.
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If your security software's firewall is on, a message may appear warning you that Canon software is attempting
to access the network. If this warning message appears, set security software to always allow access.
If you are using any programs that switch between network environments, check their settings. Some programs
use a firewall by default.
If printer is connected to an AirPort Base Station via LAN, use alphanumeric
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characters for network identifier (SSID). (Mac OS)
If the problem is not resolved, redo setup.
• For Windows:
Use the Setup CD-ROM or follow the instructions on the Canon website.
• For Mac OS:
Follow the instructions on the Canon website.
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