I have removed covers blown out everything with compressed air. I cannot see any paper or anything else in the printer . but I am still getting paper jam error of 3 flashes after about a 60 second startup of the printer. I can only assume that there must be a sensior wrongly indicating the fault. Where is the sensior located? Hope some one can help or it's the rubbish bin.

Office Equipment & Supplies - Canon - PIXMA - Pixma iP4500 InkJet Printer