20 Most Recent Brother SE-270D Computerized Sewing Machine - Page 3 Questions & Answers

you should take it to a professional

Clean the machine, especially the bobbin and bobbin case area and around the feed dogs. Take all the thread off the top of the machine, including thread off the spool pin. Raise the presser foot. Rethread the top with the presser foot UP, which lets the thread get between the two tension disks. Put the foot down to sew, and hold the ends of the bobbin and top threads together behind the presser foot for the first 2-3 stitches in each seam. See also: http://www.picturetrail.com/sfx/album/view/22521551 I'm betting you're seeing something like the last two pairs of photos.

Have you released the presser foot lift?

try to rethread the machine all the way back to the spool of thread and check the top and bottom tensions on scrap of same fabric

Perhaps the needle thread tension is too loose for the material your sewing. It could be that your thread dog is clogged with thread (this has happened to me) Check your bobbin, perhaps its just wound poorly.
OR the needle you are using is too fine/heavy for the thread.

Try checking the clutch on the motor or maybe a faulty drive belt

The Brother 270D uses an LED light. Part number XC3503021. The assembly costs about $25. I do not believe this is a user installable part.

Bobbin won't spin in hook? .. you may have something blocking the thread 'path'...or sensors? Try threading manually, right through with some unwaxed floss... while the machine is turned off.. or better still.. as you do each thread 'tension' area... check with a flashlight to see there isn't anything lodged (old threads caught anywhere...) when was the last time you had your machine cleaned?

You might have a piece of the needle lodged in the shuttle where the bobbin goes in or some thread under the shuttle. If so clear out very gently to unjam the shuttle so it will be free again to spin the bobbin. Use the hand wheel not the presser foot.

There's a possibility of it being related. I would need more information though.