Next check all key parts like tension, bobbin winder, etc. When it comes to lubrication, you should follow your manual to make sure you find the correct lubricating points and the right amount of oil to use. Next, go to the bobbin and remove it and its case, if you can, and clean that of dirt and lint as well. Next, take a cloth or a nice soft bristle brush and sweep those areas clean. Then peer inside and see if there is a build-up of lint and dirt. The first thing you need to do is take the cover off the machine and key areas like the needle plate, etc. The servicing of all sewing machines are basically the same.
