What to do if the thread keeps breaking on my SunStar KM-380BL Sewing Machine?
If the thread is breaking on your SunStar Sewing Machine, it could be due to several reasons. Ensure the needle is threaded correctly and replace any bent or broken needles. Also, check the upper thread tension, as it might be too tight, or the lower thread tension, as it might be too loose. If the upper thread is loose, adjust the take-up lever spring.
How to fix poor thread adjustment on a SunStar Sewing Machine?
If you're experiencing poor thread adjustment on your SunStar Sewing Machine, it may be due to imbalances in the upper and lower thread tensions; in this case, adjust them. Also, the thread take up spring tension may be inadequate, so adjust the thread take up spring tension. Another cause could be an inadequate gap between the opener and hook; in this case, adjust the gap between the opener and hook.
Why is the thread length too short after trimming on my SunStar KM-380BL?
If the thread length is too short after trimming on your SunStar Sewing Machine, adjust the trimming timing. Also, adjust the thread release stroke if the opening on the thread tension control plate is too small. Adjust the tension of the auxiliary thread tension control assembly if it's too strong. Adjust the thread take up stroke if it is too large. Finally, increase the volume adjustment if it is set too low.
Why does the needle keep breaking on my SunStar KM-380BL Sewing Machine?
If the needle of your SunStar Sewing Machine is breaking, several factors could be at play. First, ensure the needle is correctly inserted and positioned at its highest point. If the needle is bent, replace it. Additionally, the timing of the feed dog, needle, and hook may be off, requiring adjustment.
What to do if upper thread falls out when starting to sew on my SunStar KM-380BL Sewing Machine?
If the upper thread falls out when starting to sew, or if sewing is skipped on your SunStar Sewing Machine, make sure the needle is correctly reinserted to its highest position and replace it if it is bent. Ensure the thread is inserted in the right way. Adjust the timing of the needle and hook if needed. If the remaining upper thread is too short, increase the adjustment volume of the upper thread on the control box. If the lower thread holder isn't holding the lower thread after trimming, adjust its location and tension. Finally, readjust the needle’s up-stop film position if the thread take up lever pulls the upper thread out of the needle when sewing starts.
How to troubleshoot trimming miss on SunStar KM-380BL?
If your SunStar Sewing Machine is experiencing trimming misses, readjust the movable knife setting position to ensure the height and distance between the movable knife and the hook match. Correct the tension adjustment and surface contact of movable and fixed knives if they are bad. Ensure the needle is correctly inserted. Replace scratched or abraded movable or fixed knives. Adjust the timing of the trimming cam if it's wrong, and readjust the thread release stroke if it is too small.
General| Brand | SunStar |
|---|---|
| Model | KM-380BL |
| Category | Sewing Machine |
| Language | English |
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