Innov-is F420

FAQs & Troubleshooting

FAQs & Troubleshooting

Incorrect thread tension

When the thread tension is incorrect, check the machine according the following procedure.

 

1. Check that the machine is threaded correctly.

  • The bobbin thread is visible from the right side of the fabric. (Refer to illustration below)
  • The upper thread appears as a straight line on the right side of the fabric.
image

(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

The bobbin threading is incorrect.

Return the upper thread tension to the standard setting, and then refer to Upper thread tightened up to correct the threading.

 

  • The upper thread is visible from the wrong side of the fabric. (Refer to illustration below)
  • The bobbin thread appears as a straight line on the wrong side of the fabric.
  • The stitching on the wrong side of the fabric is loose or has slack.
image

(1) Wrong side of fabric

(2) Upper thread

(3) Right side of fabric

(4) Bobbin thread

(5) Upper thread visible from wrong side of fabric

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  to correct the upper threading.

 

 

2. Check that a needle and thread appropriate for the fabric are 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 Combination of fabric, thread and needle to check that a needle and thread appropriate for the fabric are being used.

 

 

3. Select the appropriate setting on the thread tension.

Adjust the upper thread tension to select an appropriate thread tension.

  • The setting selected for the upper thread tension is not appropriate.
  • Refer to Upper thread tightened up 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.

If the bobbin thread is visible from the right side of the fabric

image

(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

Turn the thread tension dial to the left to decrease the tension of the upper thread. (Loosen the thread tension.)

 

 

image

 

 

 

If the upper thread is visible from the wrong side of the fabric

image

(1) Wrong side of fabric

(2) Bobbin thread visible from right side of fabric

(3) Upper thread

(4) Right side of fabric

(5) Upper thread visible from wrong side of fabric

Turn the thread tension dial to the right to increase the tension of the upper thread. (Tighten the thread tension.)

 

 

image

If your question was not answered, have you checked other FAQs?

Have you checked the manuals?

If you need further assistance, please contact Brother customer service:

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Innov-is F420

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