JA1400
FAQs & Troubleshooting |
Incorrect thread tension
When the thread tension is incorrect, check the machine according the following procedure.
(1) Lower side of fabric (2) Lower thread visible from upper side of fabric (3) Upper thread (4) Upper side of fabric (5) Lower thread |
The lower threading is incorrect.
If the bobbin thread was incorrectly threaded, the upper thread may be too tight. In this case, refer to “ How do I install the bobbin wound with thread?”
(1) Lower side of fabric (2) Upper thread (3) Upper side of fabric (4) Lower thread (5) Upper thread visible from lower side of fabric |
The upper threading is incorrect.
If the upper thread was incorrectly threaded, the upper thread may be too loose. In this case, refer to “ How do I thread my machine?”
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 Combination of fabric, thread and needle.
Turn the thread tension dial to select an appropriate thread tension.
The appropriate thread tension differs according to the type of fabric and thread being used.
The tension of the thread will affect the quality of your stitches. You may need to adjust it when you change fabric or thread.
We recommend that you do a test sample on scrap of a fabric before you start to sew.
Correct tension
Correct tension is important as too much or too little tension will weaken your seams or cause puckers on your fabric.
(1) Surface of fabric |
Upper tension is too tight
Loops will appear on the surface of the fabric.
Reduce the tension by turning the upper tension control dial to a lower number.
(1) Surface of fabric |
Upper tension is too loose
Loops appear on the back of the fabric.
Increase the tension by turning the upper tension control dial to a higher number.
(1) Surface of fabric |