The thread underneath, coming from the bobbin, is too loose on the underside of the fabric. The seam looks fine from the top but when you turn the fabric over it looks like little dots of thread from the top with looser waves of thread from the bobbin.
According to the manual it looks like the top thread tension is too loose. I have it cranked as tight as it will go (9 on a scale of 0-9).
I've followed the instructions for adjusting both bobbin tension and regular tension in the manual, several times. It does seem to improve a bit when I make the top tension as tight as possible but I can't make it any tighter.
I've even tried making the bobbin tension tighter and looser than recommended in hopes that the top tension would sort itself out. No luck. Is there anything else that can affect tension on the machine?
The top seam is actually the bobbin thread. dots on the underside means that the top tension is too tight. you may have a piece of thread or something gummy caught between the upper tension disks.
The seam on the underside looks the way it should, but the top seam is all loose and doesnt look correct
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