Brother International SE-400 Users Manual - English - Page 158

Adjust the tension of the upper - combination sewing machine

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APPENDIX Symptom Probable Cause Remedy The lower thread is tangled or breaks. A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. The thread is tangled on the wrong side of the fabric. The upper thread was not threaded correctly. Correct the upper threading. The upper thread was not threaded correctly. Correct the upper threading. Make sure that the thread is hanged on the thread guide spring which is on the left side of the thread guide cover. The bobbin thread is incorrectly installed. Correctly install the bobbin thread. The thread tension is incorrect. The combination of fabric, thread and needle is not correct. The presser foot holder is incorrectly installed. Select a thread and needle that are appropriate for the type of fabric being sewn. Correctly install the presser foot holder. The thread tension is incorrect. Adjust the tension of the upper thread. A bobbin designed specifically for this machine is not used. Incorrect bobbins will not work properly. Only use a bobbin designed specifically for this machine. The upper thread is The bobbin thread is incorrectly too tight. installed. Correctly install the bobbin thread. The upper thread was not threaded correctly, or the bobbin is incorrectly installed. Correctly thread the upper thread and correctly install the bobbin thread. The spool is incorrectly installed. Correctly install the spool. The fabric is wrinkled. The combination of fabric, thread and needle is not correct. Select a thread and needle that are appropriate for the type of fabric being sewn. The needle is bent or blunt. Replace the needle. If thin fabrics are being sewn, the Shorten the stitch length or sew with stitch is too coarse. stabilizer material under the fabric. The thread tension is incorrect. Adjust the tension of the upper thread. The upper thread was not threaded correctly. Correct the upper threading. Stitches are skipped. The combination of fabric, thread and needle is not correct. Select a thread and needle that are appropriate for the type of fabric being sewn. The needle is bent or blunt. Replace the needle. Reference page 22 page 32 page 32, page 33 page 27 page 39 page 45 page 59 page 22 page 27 page 22, page 31 page 31 page 39 page 41 page 59, page 66 page 59 page 32 page 39 page 41 156

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156
APPENDIX
— — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — — —
The lower thread is
tangled or breaks.
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 22
The thread is
tangled on the
wrong side of the
fabric.
The upper thread was not
threaded correctly.
Correct the upper threading.
page 32
The thread tension
is incorrect.
The upper thread was not
threaded correctly.
Correct the upper threading.
Make sure that the thread is hanged
on the thread guide spring which is
on the left side of the thread guide
cover.
page 32,
page 33
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread.
page 27
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
page 39
The presser foot holder is
incorrectly installed.
Correctly install the presser foot
holder.
page 45
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 59
A bobbin designed specifically for
this machine is not used.
Incorrect bobbins will not work
properly. Only use a bobbin
designed specifically for this
machine.
page 22
The upper thread is
too tight.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread.
page 27
The fabric is
wrinkled.
The upper thread was not
threaded correctly, or the bobbin
is incorrectly installed.
Correctly thread the upper thread and
correctly install the bobbin thread.
page 22,
page 31
The spool is incorrectly installed.
Correctly install the spool.
page 31
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
page 39
The needle is bent or blunt.
Replace the needle.
page 41
If thin fabrics are being sewn, the
stitch is too coarse.
Shorten the stitch length or sew with
stabilizer material under the fabric.
page 59,
page 66
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 59
Stitches are
skipped.
The upper thread was not
threaded correctly.
Correct the upper threading.
page 32
The combination of fabric, thread
and needle is not correct.
Select a thread and needle that are
appropriate for the type of fabric
being sewn.
page 39
The needle is bent or blunt.
Replace the needle.
page 41
Symptom
Probable Cause
Remedy
Reference