Canon PIXMA MG4200 Series On-Screen Manual page 484

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with Network > The Machine Stopped Working Suddenly
N042
The Machine Stopped Working Suddenly
Cannot Communicate with the Machine over the Wireless LAN
Cannot Print, Scan, or Access the Card Slot from a Computer Connected to the Network
Cannot Communicate with the Machine over the Wireless LAN
Check 1: Make sure that the machine is turned on.
Check 2: Make sure that the network settings in the machine are identical with
those of the access point.
Refer to the instruction manual provided with the access point or contact its manufacturer to
check the access point settings, and then modify the machine settings.
How to Set a WEP/WPA/WPA2 Key
Check 3: Make sure that the machine is not place as far away from the access
point.
The access point is located indoors within the effective range for wireless communication.
Locate the machine within 164 ft. / 50 m from the access point.
Check 4: Make sure that there is no obstruction.
Wireless communication between different rooms or floors is generally poor. Adjust the location
of the devices.
Check 5: Make sure that there is no source of radio wave interference in your
vicinity.
There may be a device such as a microwave oven using the same frequency bandwidth as the
wireless station. Place the wireless devices as far away from the interference source as
possible.
Check 6: Make sure that the network settings of the computer are correct.
For the procedures to connect a network device to the computer and set them up, refer to the
instruction manual of your network device or contact its manufacturer.
Check 7: Make sure that the radio status is good and adjust the installation
positions while monitoring the radio status with IJ Network Tool.
Monitoring Wireless Network Status
Check 8: Make sure that the valid wireless channel is used.
The wireless channel to be used may be limited depending on wireless network devices
installed in the computer. Refer to the instruction manual provided with your computer or your
wireless network device to specify the valid wireless channel.
Check 9: Make sure that the channel set to the access point is valid to
communicate with the computer, confirmed in Check 8.
If not, change the channel set to the access point.
Check 10: Make sure that the firewall of the security software is disabled.
If the firewall function of your security software is turned on, a message may appear warning
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