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try rethreading the machine--use EVERY thread guide
make sure the needle is inserted up into the needle holder and turned the right direction
make sure the bobbin is inserted correctly into the bobbin case and turned the right direction
clean under the needle plate and in the bobbin area for loose thread or lint
make sure thread has not come off the thread take up lever
also the jam could have caused the machine to jump time and needs a timing or a adjustment
Are you holding the end of the top thread whilst trying to pickup the bobbin thread? Put a BRAND NEW needle in - it may look OK, buy the slightest bend will be an issue. Is it the CORRECT needle for you machine? - check your manual. Is the bobbin in the case correctly and feeding out the correct direction? ...... timing may be out
I assume you are placing the bobbin at the TOP of the machine, then wrapping the end of the thread several times around the bobbin in a counter-clockwise motion? Have you made sure to "scoot" the empty bobbin next to the bobbin bar to the right? Is the thread going from your spool, directly TO the bobbin? Because it is supposed to wrap around the tension "nut" (where you start to thread your machine) before going to the bobbin.
http://www.instructables.com/id/How-to-Thread-a-Sewing-Machine/ check out this link.. it is described clearly with the help of images...
OR try to do by reading these steps..
Raise the needle to its highest position by turning the handwheel toward you.
the presser foot. This will allow the thread to easily pass through the
threading points and will prevent the machine needle from becoming
unthreaded when you begin to stitch.
a spool of thread on the spool pin located at the top of your sewing
machine. If the spool pin runs horizontally, secure the spool of thread
with the cap provided.
hold of the thread end and pass it through the designated threading
points on the top of the machine casing, then down toward the tension
assembly. The tension assembly is located on the left side of the
machine and controls the flow of thread.
the thread under the tension assembly and back up through the next
threading point at the top left of the machine. Make sure the thread
has passed between two tension discs as well as the hook that may be
attached to the left side of the tension dial.
the thread end through the lever at the top left of the machine, if
applicable, and down through the threading points at bottom left and
above the needle.
Thread the needle from the front or back of the needle. The threading direction will depend on your machine type.
Pull a few inches of thread through the eye of the needle and pull the thread to your left.
a wound bobbin into the machine, if necessary, and close the throat
plate. A few inches of bobbin thread should be pulled out to the right
and sticking out from under the closed throat plate.
Take hold of the thread that has been threaded through the machine needle.
Rotate the hand wheel toward you until the needle disappears into the bobbin case.
holding on to the thread and move the hand wheel so the needle is once
again at its highest position. As the needle rises, a loop of bobbin
thread will come up as well.
Pull the thread out toward your left to draw the bobbin thread loop further out of the bobbin case.
Step 14 Let
the top thread go and pull the bobbin thread up until the end comes up.
Pull the top and bottom threads under the presser foot and to the back
and right of the machine.
Always remember T-N-T. Thread, Needle, Tension. Assuming its threaded properly, is the needle all the way in and facing the right direction? These symptoms also suggest the bobbin may be in the bobbincase upside down thus turning in the wrong direction.
Hope this helps.