Cleaning and oiling can solve a lot of diffuse issues. Go over the manitanance section in the manual, and videos like the one bkay links to are very good help too. I often go over a machine from one end to another several times, especially a newly required one. Spend some time on it. I use cotton rags, microfiber cloths, heaps cotton swabs, and even scrape out grooves and corners with tooth picks.