Canon PIXMA MG4200 Series On-Screen Manual page 477

interfere with other access points.
Check that the printer and the access point face each other.
Connection performance may depend on the orientations of the wireless devices. Replace
the access point and the printer in another direction to achieve the best performance.
Check whether other computers are not accessing the printer.
If appears in the result of the measurement, check whether other computers are not
accessing the printer.
If still appears even if you have tried the above, finish the measurement, then restart the IJ
Network Tool to start over the measurement.
Note
If any messages appear on Overall Network Performance:, move the machine and access
point as instructed to improve the performance.
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