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Troubleshooting
58
■ 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
Remove the tangled thread. If it cannot be removed,
cut the thread with scissors.
• For details, refer to “Cleaning the race” on page 55.
b
Remove the upper thread from the machine.
c
Correct the upper threading by following the
instructions in “Threading the upper thread” on
page 15.
• If the bobbin was removed from the bobbin case,
refer to “Installing the bobbin” on page 14 to
correctly install the bobbin.
Incorrect thread tension
■ Symptoms
• Symptom 1: The bobbin thread is visible from the
right side of the fabric. (Refer to illustration below)
• Symptom 2: The upper thread appears as a straight
line on the right side of the fabric.
• Symptom 3: The upper thread is visible from the
wrong side of the fabric. (Refer to illustration below)
• Symptom 4: The bobbin thread appears as a straight
line on the wrong side of the fabric.
• Symptom 5: The stitching on the wrong side of the
fabric is loose or has slack.
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
■ 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
“Upper thread tightened up” on page 57 to correct the
threading.
<With symptoms 3 and 5 described above>
The upper threading is incorrect.
Return the thread tension dial to “4”, and then refer to
“Tangled thread on wrong side of fabric” on page 57 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 Combinations” on
page 19 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 “Adjusting the thread tension” on page 27.
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.
• 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.
Symptom 1 Symptom 3
a
b
c
d
e
a
f
c
d
e
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.
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