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I have the same problem with an MG4250 (error code 1303). Unfortunately I cannot find anyway  to run any of the cleaning routines etc. as the machine just locks up whilst the error message is displayed 
I have a Canon MG4250 which is displaying the error message 1303  (Paper Jam) I have followed all the instructions and am sure that there is no paper jammed. I am assured that according to the great God Google this can be a false error message which ...