Hello. I have a Canon PIXMA MP600 multifunction device. I have an error code "U052" on the device. I understand that means the printhead is not communicating with the printer. Before I spend about $50 on a non-returnable replacement printhead, I would be grateful if someone could let me know if there is a way to confirm whether it is the printhead, and not another part (like the logic board), that is malfunctioning, and whether, if it is the printhead, there is a way to reset or otherwise fix the chip on the printhead to avoid spending money on a new one? Many thanks.