The machine starts with a few good stitches, then jams into a tangled mess in the bobbin area. I even broke a needle the jam was so bad!
It sounds like it is not threaded properly through the tension disc. Try rethreading and make sure the presser foot lever is in the up position. If it continues, once threaded and with the presser foot down, pull on the thread through the needle. If it has resistance, it is threaded properly. If it pulls easily then there is a problem in the tension area. Check to see if there are peices of thread broke off in between the tension disc.
My model 6704 won't pick up thread 'cause the drive gears broke so the bobbin won't turn... the horizontal gear can be seen from above the bobbin carriage or both gears seen from below the machine by removing the bottom cover. gear set can be ordered from www.sewingstyle.com
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checked for binding no thread in bobbin area motor wont even try to go
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