We may have found other answers which could help you.
Click here for Sewing Machine Stitching Thread
Janome MC3000 noise?
thread OK on top but not at bottom?
How to unjam a stiff wheel on a Janome 6260?
manual for a janome model 1312 sewing machine please?
how to fix tension?
How do you adjust the tension for my xr65 sewing machine?