Brother 888-N20 Manual de instrucciones - Página 26
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n 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�
n Remedy/check details
Remove the tangled thread, and then correct the
upper threading�
1
Remove the tangled thread� If it cannot be
removed, cut the thread with scissors�
* For details, refer to "Cleaning the race" (page 24)�
2
Remove the upper thread from the machine�
3
Correct the upper threading by following the
instructions in "Upper threading" (page 9)�
* If the bobbin was removed from the bobbin case,
refer to "Winding/Installing the bobbin" (page 7)
to correctly install the bobbin�
Incorrect thread tension
n Symptoms
1� The bobbin thread is visible from the right side of
the fabric� (Refer to the illustration below�)
2� The upper thread appears as a straight line on the
right side of the fabric�
3� The upper thread is visible from the wrong side
of the fabric� (Refer to the illustration below�)
4� The bobbin thread appears as a straight line on
the wrong side of the fabric�
5� The stitching on the wrong side of the fabric is
loose or has slack�
Symptom 1
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
6 Upper thread visible from wrong side of fabric
n Cause/remedy/check details
Cause 1
The machine is not correctly threaded�
<With symptoms 1 and 2 described above>
The bobbin threading is incorrect�
Return the thread tension dial to "4", and then
refer to "Winding/Installing the bobbin" (page
7) to correct the threading�
<With symptoms 3 through 5 described above>
The upper threading is incorrect�
Return the thread tension dial to "4", and then
26
Symptom 3
refer to "Upper threading" (page 9) to correct
the upper threading�
Cause 2
A needle and thread appropriate for the fabric
are not being used�
The machine needle that should be used
depends on the type of fabric sewn and the
thread thickness�
If a needle and thread appropriate for the fabric
are not being used, the thread tension will not be
adjusted correctly, causing wrinkles in the fabric
or skipped stitches�
* Refer to "Fabric/Thread/Needle Combination" (page
12) to check that a needle and thread appropriate
for the fabric are being used�
Cause 3
An appropriate upper tension is not selected�
Select an appropriate thread tension�
Refer to "Thread tension" (page 17)�
The appropriate thread tension differs depending
on the type of fabric and thread being used�
* Adjust the thread tension while test sewing on a
piece of scrap fabric that is the same as that used in
your project�
Note
• If the upper threading and bobbin threading
are incorrect, the thread tension cannot be
adjusted correctly� Check the upper threading
and bobbin threading first, and then adjust the
thread tension�
• If the bobbin thread is
visible from the right
side of the fabric
Turn the thread tension
dial counterclockwise to
loosen the upper thread
tension�
• If the upper thread is
visible from the wrong
side of the fabric
Turn the thread tension
dial clockwise to tighten
the upper thread tension�
Fabric is caught in the machine
and cannot be removed
If the fabric is caught in the machine and cannot be
removed, the thread may have become tangled under
the needle plate� Follow the procedure described
below to remove the fabric from the machine� If
the operation cannot be completed according to
the procedure, instead of attempting to remove it
forcefully, contact your nearest Brother authorized
service center�
4
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