They don't make Janomes so the consumer can get inside to oil. But they do need oil -- you just have to take it to your Janome dealer to have them do it.
But, you can get inside the bobbin area and clean. Remove the needle plate and take a picture of how the bobbin case is sitting. Remove the bobbin case and get all of the lint and needle fragments out. Put a drop of oil in the center hole and in the ring just around the center hole. You might be able to put a drop of oil on the feed dog joints, if you know where to look. Then put it back together.
You can also oil the take-up area, but you may have to do it through the slot in the front, if the end cap doesn't come off.