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Troubleshooting
If the machine stops operating correctly, check the
following possible problems before requesting service.
You can solve most problems by yourself. If you need
additional help, Brother support website offers the latest
FAQs and troubleshooting tips. Visit us at https://s.brother/
cpjao/.
If the problem persists, contact your authorized Brother
dealer or the nearest Brother authorized service center.
■ Frequent troubleshooting topics
Detailed causes and remedies for common troubleshooting
topics are described below. Be sure to refer to this before
contacting us.
Upper thread tightened up
Tangled thread on wrong side of fabric
Incorrect thread tension
Fabric is caught in the machine and cannot
be removed
If the thread becomes tangled under the
bobbin winder seat
Upper thread tightened up
■ Symptom
• The upper thread appears as a single continuous line.
• The bobbin thread is visible from the right side of the
fabric. (Refer to the illustration below.)
• The upper thread has tightened up, and comes out
when pulled.
• The upper thread has tightened up, and wrinkles
appear in the fabric.
• The upper thread tension is tight, and the results do
not change even after the thread tension is adjusted.
a
1 Wrong side of fabric
2 Bobbin thread visible from right side of fabric
3 Upper thread
4 Right side of fabric
5 Bobbin thread
■ Cause
Incorrect bobbin threading
If the bobbin thread is incorrectly threaded, instead of the
appropriate tension being applied to the bobbin thread, it
is pulled through the fabric when the upper thread is
pulled up. For this reason, the thread is visible from the
right side of the fabric.
■ Remedy/check details
Correctly install the bobbin thread. (page 22)
Tangled thread on wrong side of fabric
■ Symptom
page 87
page 87
page 88
page 89
page 91
■ Cause
Incorrect upper threading
If the upper thread is incorrectly threaded, the upper
thread passed through the fabric cannot be firmly pulled
up and the upper thread becomes tangled in the bobbin
case, causing a rattling noise.
■ Remedy/check details
Remove the tangled thread, and then correct the upper
threading.
a
b
c
c
e
• The thread becomes tangled on the wrong side of the
fabric.
• After starting sewing, a rattling noise is made and
sewing cannot continue.
• Looking under the fabric, there is tangled thread in
the bobbin case.
Remove the tangled thread. If it cannot be removed,
cut the thread with scissors.
• For details, refer to "Cleaning the race" on page 85.
Remove the upper thread from the machine.
Correct the upper threading by following the
instructions in "Threading the upper thread" on
page 23.
• If the bobbin was removed from the bobbin case,
refer to "Installing the bobbin" on page 22 to
correctly install the bobbin.
Troubleshooting
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