Brother BAS-416 User manual

Page 1 of 3

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.

Rotary Hook

Check for broken bits of

needles in this area.

Motor Locks – Causes and Solutions

For Technical Assistance Please Call Toll Free 1-877-4BROTHER

Page 2 of 3

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.

o Replace bent presser foot and adjust presser foot height.

o Replace bent needle.

Needle hitting needle plate

o Adjust the alignment of the needle plate. Rotate pulley to

150 degrees and see if needle goes through the middle of the

hole in the needle plate. If not, loosen the two screws that

hold on the plate and move the plate to align with needle

and retighten screws. Turn pulley backwards to stop position

(100 degrees).

Needle hit the hoop while sewing

o Loosen the needle holding setscrew of the needle that is stuck in the hoop. Rotate the

pulley to bring the needle up. Remove hoop from machine and turn pulley back to

stop position (100 degrees). Remove needle from hoop with pliers.

Moving knife is not at proper position

o Remove needle plate and check position of

moving knife. If knife is out of position try

manually moving it back into position with

your fingers. Cycle the trimmer with the

button on the keypad and recheck

adjustment.

Motor Locks – Causes and Solutions

For Technical Assistance Please Call Toll Free 1-877-4BROTHER

Page 3 of 3

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. If needed

adjust clearance of moving knife to 1.2 mm.

You will need to remove the chrome are cover

to gain access to the adjustment bolts.

Inner rotary hook adjuster set incorrectly

• Check clearance of inner rotary hook stopper,

also known as the positioning finger. It may be in to

far causing thread to wrap around it.

Thread take up lever striking the needle case cover

o Adjust thread take up driving lever so that all take up levers are even. Make sure this

is done at stop position (100 degrees). You will need to remove the tension base to

gain access to the adjustment bolt.

Needle depth or 0 degree stopper out of position

o Adjust needle depth first and then 0 degree stopper. Please refer to your instruction

manual for adjustment.

Motor Locks – Causes and Solutions

For Technical Assistance Please Call Toll Free 1-877-4BROTHER

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