If you are getting error code B200 in your Canon Pixma MP640, to fix this error you can perform below given steps to resolve it or you can contact us at Canon Printer Support Number UK, where you will get resolution for your each query.
1.Turn OFF the power of your printer and open the print head bay.
2.Turn ON power and wait for print carriage to start moving to the left and let it go past half way.
3.Before print carriage reaches left hand side (but after going halfway across) shut the cover.
4.Leave the Printer turned on.

This is how can fix this error, for the resolution of more errors contact us at Canon Printer Help Number UK.
If you want to install Canon wireless printer on your Mac and Windows OS then you must read the installation guide very carefully but if the problem persists then you can contact us at 0808-178-2624 Canon printer contact number uk.