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The B200 error is a Voltage High Error.You can call Canon tech support at 1-800-828-4040 if your printer is still under warranty. They will probably send you a new printhead or a new printer.If not then please follow the steps below to remove the print head and then clean the copper contacts on them with cotton swab dampened in distilled water until they are clean.

How to remove and clean head.

1. Remove the ink cartridges.
2. Lift the gray handle on the right side of the Carrier (that holds the ink carts. and the print head).
3. Gently press the sides of the print head toward the middle about a mm, lift a bit and pull out.
4. Set the bottom of the print head on a folded damp paper towel. (Dampen ONLY with warm water)
5. Let set for a couple of minutes. Move to a clean spot and let set again. Do this four or five times.