Canon mg6850 series Online Manual page 870

Make sure there is no source of radio wave interference nearby.
Check8
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 the interference source as possible.
Make sure 5 devices are already connected.
Check9
Direct connection does not allow more than 5 devices to be connected.
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