We may have found other answers which could help you.
Click here for Sewing Machine Janome BobbinHow to unjam a stiff wheel on a Janome 6260?
Janome MC3000 noise?
I need to catch the thread on my sewing machine?
How do you adjust the tension for my xr65 sewing machine?
thread OK on top but not at bottom?
how to fix tension?