I have a PR620 Brother embrodiery machine and the bobbin thread is showing up on top. It has never done this bebore. I have changed bobbin thread oiled and cleaned the machine. Can you suggest a solution. Thank you,

SOURCE: Bobbin won't p/u thread Singer 478

i have no idea how to thread this machine ?

SOURCE: brother ls2125 bobbin not picking up thread

you have the wrong size bobbin in ,its to high over the bobbin case causing it to rap around the bobbin.

SOURCE: Singer CG 550 Top thread keeps wraping around the bobbin and jam

Have you checked the top thread is correctly placed in the spring of the bobbin case?

SOURCE: janome straight stitch loose

I don't know if this is the right answer for any of you, but thought I'd put my 2 cents worth in. Often this can be the bobbin in backwards. It needs to unwind a certain way depending on the machine. I've heard a phrase for this: Mind your p's and q's which means some wind off to the right like a q, others to the left like a p. Mine has to unwind one way then be slipped backwards into a little slot or it does that loose bottom thread looping and bunching someone here mentioned. It seems everytime I get that problem I rethread the top thread 100 times before it clicks again and I remember it could be the bobbin thread. Either your manual will tell you the correct way, or you could experiment and try one or the other. Once you figure out whether you're a p or a q, mark it on your machien somewhere to remind yourself.

Good Luck and Happy Sewing!

SOURCE: Top thread keeps getting wrapped around bobbin case on LX-3125

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