SunStar SWF/C-UK1502 - User Manual

Questions and Answers

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Emily ColemanAug 18, 2025
What to do if SunStar SWF/C-UK1502 Sewing Machine thread breaks before trimming?
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  ismithAug 18, 2025
  If the thread breaks before trimming on your SunStar Sewing Machine, it could be because the upper thread is too short; check the main and sub tension adjuster for dents or damage to the movable blade. It could also be that the lower thread is too short, doesn’t unwind smoothly, or is too weak or elastic. Try adjusting the upper thread tension, removing any dents using a whetstone or sandpaper or changing the movable blade. Adjust or change the bobbin case spring, clean/check for dents in the thread guide on the bobbin case, or change the lower thread.
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kkochAug 20, 2025
Why does my SunStar Sewing Machine thread break?
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  Aaron WiseAug 21, 2025
  Thread breaks can occur in your SunStar Sewing Machine for several reasons. The stitch might be too small or dense, or the thread may be breaking frequently in the same spot. Other causes include using an inadequate needle size for the thread, needle damage (bent, dented, or worn), incorrect needle installation (height, direction, etc.), or a dirty needle (adhesive, etc.). To resolve this, try re-punching the design tape, correcting the stitches, changing the needle, re-installing the needle correctly, or cleaning the needle and hook.
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Christopher JamesAug 23, 2025
What causes short upper thread after trimming on SunStar Sewing Machine?
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  fthompsonAug 23, 2025
  A short upper thread after trimming on your SunStar Sewing Machine, due to separation failure, can occur if the movable blade is too fast or too slow to separate the upper thread, the picker is in an incorrect position, or there is a picker failure. To fix this, adjust the insert angle of the movable blade to 295 degrees, adjust the picker position, and check and change the fuse F1, F3. Also, check/change the solenoid and its connection, and check the connection and change the joint board.
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Hailey NavarroAug 26, 2025
What to do if my SunStar SWF/C-UK1502 is not trimming?
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  Dustin CortezAug 26, 2025
  If your SunStar Sewing Machine is experiencing trimming failure, it could be due to a short-circuit of the trimming fuse, a poor connection or quality of the trimming solenoid, a bad connection, or a damaged trimming driver TR. You should check and change the fuse F1 in the joint board, check and change the solenoid and its connection, and change the joint board.
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Chase TurnerAug 28, 2025
What to do if my SunStar SWF/C-UK1502 Sewing Machine has poor stitch tension?
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  Margaret TorresAug 28, 2025
  Poor stitch tension in your SunStar Sewing Machine can result from several factors. These include weak upper thread tension, uneven upper thread tension due to foreign substances, weak lower thread tension, uneven lower thread tension, thread thickness, poor timing of the needle and hook, or insufficient oil in the hook. You can address this by adjusting the tension, cleaning the main and sub tension adjusters, cleaning the bobbin case and checking the bobbin spring tension, changing to a quality thread, adjusting the timing, or oiling the raceway of the hook.
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Nancy HatfieldAug 30, 2025
What to do if my SunStar SWF/C-UK1502 needle breaks?
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  joshuasandersAug 30, 2025
  Needle breakage in your SunStar Sewing Machine can be attributed to several reasons: a bent needle, a bad quality needle, a worn or bent needle tip, the needle touching the hook point, incorrect needle installation, or the needle touching the needle hole on the plate. To fix this, try changing the needle, spacing the needle and the hook point, correcting the installation, checking if the needle plate is unscrewed, or adjusting the position of the needle bar.
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Mr. Timothy Watts DVMSep 2, 2025
How to fix operation failure of SunStar SWF/C-UK1502?
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  Steven BarnesSep 2, 2025
  Operation failure in your SunStar Sewing Machine can stem from loose belt tension or belt damage, power failure or short-circuit of the fuse, or failure to sense signals for needle position or 1 rotation. To resolve this, adjust the belt tension or change the belt. Check the fuse in the main shaft motor and replace it if necessary. Run a manual color change and check if the signal lamps blink correctly. Adjust the half-turn film. Address the cause and press RESET. Check the START switch connection.
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Christopher BrownSep 4, 2025
What to do if my SunStar SWF/C-UK1502 has a bad jump?
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  Garrett MoralesSep 4, 2025
  A bad jump in your SunStar Sewing Machine might be caused by a short-circuit of the fuse for the jump circuit, a bad solenoid and bad solenoid wiring, a bad connection, or a switch failure on the tension adjusting board and a bad circuit board. To solve this, change the front fuse F3 in the joint board, check the wiring and change the solenoid, check the connection, and change the switch and circuit board.
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Mackenzie Campos MDSep 7, 2025
Why is my SunStar SWF/C-UK1502 Sewing Machine puckering?
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  Kristen AlexanderSep 7, 2025
  Puckering in your SunStar Sewing Machine may be due to excessive thread tension, excessive pressure of the presser foot, needle failure (worn out or damaged needle tip), the needle being too large for the thread, or the needle hole being too large for the needle. Try adjusting the tension, changing the presser foot spring, changing the needle, or using an adequate size of needle.
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Andres WoodsSep 9, 2025
What causes incorrect stop position on SunStar SWF/C-UK1502 Sewing Machine?
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  Nathan SanchezSep 10, 2025
  Incorrect stop position on your SunStar Sewing Machine can be caused by loose tension on the main driver belt or an incorrect position of the encoder or a bad encoder. To solve this, adjust the belt tension or adjust the encoder position or change the encoder.