Canon PIXMA MX870 - Manual (Page 903)

Check 5: Were the MP Drivers installed after printer registration on
Bluetooth Devices (Add a Bluetooth Device in Windows 7)?
If you have installed the MP Drivers after registering the printer as a Bluetooth device on Bluetooth
Devices (Add a Bluetooth Device in Windows 7), delete the printer and then register it again.
For more information about the procedure, see
Preparation .
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