I have tried using the tensions from 1 - 9 and even on 9 the top thread is showing through on the back.
I'm not sure how free motion plays into tension. If you were just sewing regular way with an all purpose foot and feed dogs, what you've described is extreme low top thread tension, regardless of tension selector setting. It's not zero tension as that tends to ball up underside of fabric and break the top thread.
Suggest switching back to an all purpose foot and dogs up, dont rethread or change bobbin or needle. Using scrap of same or similar fabric, see if you can get it to tension correctly with a simple straight stitch.
I suspect its a bobbin tension issue but they're extremely rare.
Please comment here with results.
SOURCE: I have a Janome Memory
Before you take it for a service, how about cleaning the bobbin case. You have to take off the metal plate but them it lifts out easily. get a manual on line to show you how
SOURCE: I am trying to set
Sounds like you have no tension on the upper thread. Rethread the top thread, make sure you have the pressure foot raised, and have your tension around 5. Don't forget to lower the pressure foot before you began to sew.
SOURCE: how to fix the tension on a memory craft 8000-way too loose at the top
it's possible that the tension dial has gone bad & needs to be replaced
at a sewing machine repair shop
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