As Linda said. you should put ONE drop of oil on the wick. (If you poke it and it is dry, it needs oil.)
Also you can put a drop on the shaft that makes the needle go up and down. I have had Janome machines for years - models 8000, 760, 6600P, 7700P.
The drop of oil is recommended on the Janome 6500/6600 Yahoo Chat group.
Just make sure to use oil sparingly.