I recently purchased the 7550 for general sewing and quilting. I bought it on Ebay for 500.00 which I think is reasonable. I have the 7560 and love it. However, when I opened the machine, it asks for a 4 digit security code which I did not find in the material provided. Does anyone know how to get beyond this code or how to reset this code so I can use the machine. I have emailed the dealer also, hopiing to get an answer. Thanks for you input - Carole