F6 error on your machine means the machine is detecting a speed reduction.This may be caused by any number of issues,thread caught in the machine or may be an indication that the machine requires servicing.Check the bobbin case area & take up lever linkage for thread caught in the mechanism.If this fails take your machine to an authorised Brother service centre.
sewman
February 2011
Make sure the bobbin area is clean failing that it will need to be looked at
ken
February 2011
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