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Troubleshooting 189
5
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Incorrect thread tension
Symptoms
Symptom 1: The lower thread is visible from the upper side of the fabric.
Symptom 2: The upper thread appears as a straight line on the upper side of the fabric.
Symptom 3: The upper thread is visible from the lower side of the fabric.
Symptom 4: The lower thread appears as a straight line on the lower side of the fabric.
Symptom 5: The stitching on the lower side of the fabric is loose or has slack.
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 upper thread tension to the standard
setting, and then refer to “Upper thread tightened
up” (page 186) to correct the threading.
<With symptoms 3 and 5 described above>
The upper threading is incorrect.
Return the upper thread tension to the standard
setting, and then refer to “Tangled thread on
wrong side of fabric” (page 187) to correct the
upper threading.
Cause 2
A needle and thread appropriate for the fabric
are not being used.
The sewing 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 “Needle types and their uses” (page
41) to check that a needle and thread
appropriate for the fabric are being used.
Cause 3
An appropriate setting on the thread tension dial
is not selected.
The setting selected for the upper thread tension
is not appropriate.
Refer to “Adjusting the thread tension” (page 59)
to select an appropriate thread tension.
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
z 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
Press in the operation panel to decrease
the tension of the upper thread.
If the upper thread is visible from the wrong
side of the fabric
Press in the operation panel to increase
the tension of the upper thread.
Symptom 1 Symptom 3
a Lower side of fabric
b Lower thread visible from
upper side of fabric
c Upper thread
d Upper side of fabric
e Lower thread
f Upper thread visible from
lower side of fabric
191


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