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Brother BAS-416 Manual

Motor locks - english.
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Motor Locks – Causes and Solutions
An increased resistance that makes it either hard or impossible for the main motor to turn the
degree wheel or pulley causing a motor lock error. Listed below are some causes of the
problem. Listed in the order that they occur most.
Lack of Lubrication
Oil the machine as specified under initial unpacking procedure. Make sure and oil the
rotary hook.
Thread tangled in rotary hook
Open bobbin case cover and look for thread tangled in the rotary hook around it or
behind it and remove thread. Rotate pulley back to stop position after finished. This
can be caused by bird's nest, which is created by various things. Such as
Incorrect threading of machine
Incorrect needle size or type of needle for application
Needle being installed backwards
Worn needles
Incorrect backing for the application.
Loose upper thread tension
Inner rotary hook adjuster set incorrectly
Foreign object stuck in the rotary hook
To check if something is causing binding in the rotary hook see if you can
move the bobbin basket clockwise and counter-clockwise. The bobbin
basket is part of the rotary hook. This is part that the bobbin case fits into.
To check the play put two fingers on the bobbin case latch and rotate your
fingers in both directions. You should have a little play in both directions. If
not then there is something lodged in the raceway of the rotary hook. Clear
obstruction or replace rotary hook. This can be caused by
Broken pieces of needle lodged somewhere in hook
Thread badly entangled in rotary hook.
For Technical Assistance Please Call Toll Free 1-877-4BROTHER
Rotary Hook
Page 1 of 3
Check for broken bits of
needles in this area.

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   Summary of Contents for Brother BAS-416

  • Page 1

    Motor Locks – Causes and Solutions For Technical Assistance Please Call Toll Free 1-877-4BROTHER An increased resistance that makes it either hard or impossible for the main motor to turn the degree wheel or pulley causing a motor lock error. Listed below are some causes of the problem.

  • Page 2

    Motor Locks – Causes and Solutions For Technical Assistance Please Call Toll Free 1-877-4BROTHER A buildup of thread is behind the moving knife o Remove needle plate and remove the thread build up behind the moving and fixed knife. This build up is causing the moving knife not to be able to complete its cycle Needle hitting presser foot o Adjust presser foot so that is aligned with the hole in the needle plate.

  • Page 3

    Motor Locks – Causes and Solutions For Technical Assistance Please Call Toll Free 1-877-4BROTHER Moving knife is out of adjustment o Before adjusting moving knife check the fixed knife to see if it is 10mm from the needle and against the pin. Usually if the fixed knife is pushed all the way back against its adjustment slot that is approximately 10mm.

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