I have Brother LX-3125. I am using it for the first time. How can I take the bobbin out of the bobbin case. The case has an empty bobbin snapped in.

hi Lori.
at this link you will see some diagrams that might help you out.

diagram of threading brother LX 3125 sewing machine Google Search
you could also try this one.
diagram of threading brother LX 3125 sewing machine Google Search

Use a mirror and make sure that the area is perfectly clean and there are no obstructions. Then make sure that the needle is all the way up to the top of its cycle and then insert the bobbin.

rethread the machine top & bobbin
change the needle
make sure the bobbin is not warped
clean under the needle plate & in the bobbin area for loose thread or lint

the best thing to do is have the machine checked at a sewing machine shop

are you adjusting the little screw on the tension spring on the bobbin case by minute amounts each time? Only turn it a quarter turn each time you change it.

If you do the dangle test, (suspend the bobbin by the thread tail) the bobbin case and bobbin should stay still in the air, but a gentle tug on the case should release thread. Adjust the little screw with the mini screwdriver in your kit until you get it to this point. turn it left to loosen and right to tighten.

Also check that the bobbin is in the bobbin case the right way, page 12 of your manual should show this. Yout want the bobbin to turn anticlockwise when you pull the thread tail. Then load it into the shuttle using the latch on the bobbin case to secure it.

It is possible that the tension spring itself is faulty in which case you can buy a new bobbin case for the machine from the local machine shop, or http://www.sewingpartsonline.com/brother-lx-3125-parts.aspx

sounds like you have the bobbin clutch disengaged. Check to make sure you have flipped it back to sewing mode.

Most likely your machine is not threaded right, read your manual closely and double check yourself. Rethread your machine, no mixed thread use same weight, color does not matter but weight does. With your presser foot down, your top thread should be had to pull, with it up it should pull freely. Make sure your bobbin is wound evenly, and on a fresh bobbin. Then put in a new needle. Now, if the machine is still acting up, it may be your timing. You can call Brother at 1-877-276-8437 customer support. if you need a manual, go to www.brother-usa.com. I am answering this for free just to try to help you. Good luck

Mine did the same thing. The needle is probably to high. Do not insert the needle all the way to the top. Lower it a bit and it should zig zag!

Is there thread caught in the bobbin case? How far are you turning the wheel and are you holding the end of your bobbin thread out so that the top thread can hook it?

You should hold the end of the thread coming through the needle until the thread has grasped the bobbin thread.