Canon printer PIXMA MG6821 User Manual

Check6 Check for obstructions.
Wireless communication between different rooms or floors is generally poor. Move the machine as necessary.
Check7  Make sure there is no source of radio wave interference nearby.
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 machine as far away from interference sources as possible.
Check8  Make sure 5 devices are already connected.
Direct Connection does not...

Network Key Unknown
WEP or WPA/WPA2 Key Set for Access Point Unknown, Cannot Connect
Setting an Encryption Key
WEP or WPA/WPA2 Key Set for Access Point Unknown, Cannot
Connect
For details on setting up a wireless router, see the instruction manual provided with the wireless router or
contact its manufacturer. Make sure your computer can communicate with the wireless router.
Set up the machine to match the wireless router settings using IJ Network Tool.
Setting an Encryption Key
For details on setting up...

If the machine is connected to an AirPort Base Station via a LAN, check the settings in
Wireless Security  of AirPort Utility .

Administrator Password Set for Machine Unknown
Initialize the machine settings.
Select  Reset all  to restore administrator password to default.
Reset setting
After initializing the machine settings, redo setup.

Machine Cannot Be Used After Replacing Wireless Router or
Changing Its Settings
When you replace a wireless router, redo the network setup for the machine.

With Encryption On, Cannot Communicate with Machine After
Changing Encryption Type at Wireless Router
If you change the encryption type for the machine and it subsequently cannot communicate with the
computer, make sure the encryption type for the computer and the wireless router matches the type set
for the machine.
Cannot Communicate with Machine After Enabling MAC/IP Address Filtering or Encryption Key on
Wireless Router
856 

Printing Is Slow
Check1 Machine may be printing or scanning a large job from another computer.
Check2  Monitor signal status and move machine and wireless router as necessary.

Ink Level Not Shown on Printer Status Monitor (Windows)
Use the printer driver with bidirectional communication.Select  Enable bidirectional support  in the Ports sheet of the properties dialog box of the printer driver.
How to Open the Printer Driver Setup Window
858 

Other Network Problems
Message Appears on Computer During Setup
Packets Are Sent Constantly (Windows)
Checking Network Information
Restoring to Factory Defaults
859 

Message Appears on Computer During Setup
Enter Password Screen Appears During Setup
Encryption Settings Screen Appears When Access Point Selected from Search Screen
"You are connecting the machine to the non encrypted wireless network" Appears
Enter Password Screen Appears During Setup
The following screen appears if the machine is set up for use with a network and an administrator
password has been set.