Bicor vx1005 thread keeps breaking - Brother LS2020 Sewing Machine

If you increase the top tension, it should pull the bobbin thread up into the fabric.

check that the bobbin carrier is fixed properly on the shaft

Be sure to try a brand new needle and check that it is installed correctly. If that doesn't help, then, as Bill recommended, the machine is probably out of time and needs service.

I ordered the manual through http://www.mastersewusa.com but still do not have the download link. It has been almost a week now. The site said it would be in my e-mail in 3 hrs. Well today is day 5.

try these sites and see if they can help you,,you'll have to call or
email them
sewvacdoctor.com
a1sewingmachines.com

You can download a copy for $5 from this site.
http://www.mastersewusa.com/info_bicorvx1005_2007.html
Printed manuals to the US are $12 and the rest of the world $17.
Hope this helps!

Look through these threading guides for a Brother that has the same features. http://www.sewusa.com/Sewing_Machine_Threading_Diagrams.htm

The above site has a manual, but I not a threading guide. Unless it is the same as another model.

Unfortunatly it won't be free, as all websites I have found charge for the manual. MASTERSEWUSA.COM however was the least expensive, charging $5.00 for the manual. Hope this helps! Matthew

The impulse is to blame the bobbin, because that's where the thread bunches. But the problem is probably with the top thread tension. The tension is too loose, allowing the bobbin to help itself to all the thread it wants. Retrace the path of the thread from spool to needle and see if you missed anything. The instructions in my VX1005 manual are not clear. I had to try a couple of paths before I got it right. Make sure the spring in the tension disk setup is moving freely. You should feel a fair amount of resistance when you pull on the needle thread. Hope this helps.

Terry

Try a different bobbin. Look for one that is a little narrower. I had the same problem and changing to a narrower bobbin fixed it.