Model 707? Are you sure needle is in with flat side to back and inserted all the way up?
Or is there a problem with take up lever
SOURCE: Threading a bernina serger
Here is a little jingle to remember as far as the order of threads to thread...
Upper looper, lower looper, left needle, right.
Usuall if you give numbers to the threads from left to right as 1,2,3,4 , you would thread it in the order of 3, 4, 2, 1 . Also when threading the loopers be sure the lower looper thread goes over the top of the upper looper thread as it goes out the back.
Hope this helps.
SOURCE: Threading a Bernina 900
Place the thread spool on one of the two thread guides. Bring the thread across to the notch on top of the machine guide it to the left and down the front of the machine. Directly under that threader close to the needle wrap it down under and go back to the top right to left then go to the top lever in the up position use your wheel to the right , wrap from right to left going down and threading. Wrapping just means placing around. Now for the bobbin. take casing out wit bobbin thread counter clockwise place in casing and release handle of casing put in machine making sue it is locked in. THen go fishing.
SOURCE: How do you thread a bernina 1008?
I hope I can explain this in an understandable way!
1. Pull the end of the thread from the spool to the left and "click" it into the little metal guide (on the top of the machine) that is at the back of the long **** in the top. It's easiest to do this by holding the thread tight between your two hands, placing it behind the guide, and pulling forward until it clicks in.
2. for the remaining steps, let the thrread slide between the fingers of your right hand, keeping a little tension on it, as you thread the machine with your left hand.
3. Bring the thread end forward, laying the thread into the ****, and continue downward, along the right side of the vertical silver bar/hook thingy.
4. Bring the thread under that bar from right to left, and go back up towards the top of the wide **** in the front of the machine. As you pull up, the thread will click into the lower bar/hook thingy.
5. Lay the thread along the right side of the wide ****, go over the top of the needle bar (the part that goes up and down in the ****) and bring it down the left side. It will click into the needle bar.
6. Bring the thread back down towards the presser foot. Right in front of the screw that holds the foot on, there is a hook that opens on the left side. Slide the thread behind this hook, and then thread the needle from front to back.
7. Hold onto the end of the thread and run the needle down and back up once. Pull on the thread, and it will pull up a loop of the bobbin thread. Stick the tip of your scissors or seam ripper into the loop and pull the end of the bobbin thread out.
8. Slide your top thread through the slot in the presser foot so it comes out from underneath the foot, and you're ready to go! (Be sure and hold onto both threads for the first few stitches when you start a seam, to keep if from jamming up inside.)
Let me know if you need any clarification.
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