Brother BAS-401 Manual

Upper thread breaks
•Upper thread is not threaded correctly
oCorrectly thread the machine
•Upper thread tension is to tight
oReduce upper thread tension
•Needle is not installed correctly
oInstall needle correctly
•Needle is bent or worn
oReplace the needle
•Presser foot height is incorrect
oAdjust presser foot height to thickness of material
•Presser foot has nicks or burrs on it
oReplace presser foot
•Needle is hitting the needle plate
oReposition needle plate
•Presser foot is not correctly positioned to the needle plate
oAlign presser foot to hole in the needle plate
•Rotary hook is dirty or needs to be oiled
oClean and oil rotary hook
•Rotary hook over oiled
oClean excess oil from rotary hook
•Needle bar(s) over oiled
oClean excess oil from needle bar(s)
•Bobbin thread is not wound correctly
oReplace bobbin
•Bobbin case is damaged
oChange bobbin case
•Scratches on the sliding surface of the rotary hook
oSmooth scratches or replace rotary hook
•Poor quality thread
oReplace thread
•Fabric is not taut in the hoop
oRe-hoop garment
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Al ll l M Ma ac ch hi in ne es s
For Technical Assistance Please Call Toll Free 1-877-4BROTHER

•Wrong type of backing
oUse the correct backing for garment
•Design contains many small stitches of .2 mm or less
oModify design to eliminate stitches of .2mm or less
•Too much density in design
oReduce density in design
•The area around the hole in the needle plate is damaged
oReplace needle plate
•Rotary hook is out of time
oRe-time rotary hook