174
APPENDIX
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The thread is
tangled on the
wrong side of the
fabric.
The upper thread was not
threaded correctly.
Correct the upper threading.
page 30
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 30,
page 31
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread.
page 25
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 37
The presser foot holder is
incorrectly installed.
Correctly install the presser foot
holder.
page 43
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 58
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 20
The upper thread is
too tight.
The bobbin thread is incorrectly
installed.
Correctly install the bobbin thread.
page 25
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 20,
page 30
The spool is incorrectly installed.
Correctly install the spool.
page 29
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 37
The needle is bent or blunt.
Replace the needle.
page 39
If thin fabrics are being sewn, the
stitch is too coarse.
Shorten the stitch length or sew with
stabilizer material under the fabric.
page 58,
page 66
The thread tension is incorrect.
Adjust the tension of the upper
thread.
page 58
Stitches are
skipped.
The upper thread was not
threaded correctly.
Correct the upper threading.
page 30
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 37
The needle is bent or blunt.
Replace the needle.
page 39
The needle is incorrectly installed. Correctly install the needle.
page 39
Dust has accumulated under the
needle plate or in the bobbin case.
Remove the needle plate cover and
clean the race.
page 170
Symptom
Probable Cause
Remedy
Reference
Summary of Contents for Sofia BL137A2
Page 1: ......
Page 70: ...SEWING BASICS 68 ...
Page 188: ...English 885 V99 XE7973 001 Printed in China ...