1.Sudden stop during sewing; The power indicator light is on, but the hand-wheel is heavily stagnant.
1) Possible Reasons: Sewing machine has been working at a low speed for a long time; sewing machine overheating may cause automatic shutdown of motor power supply.
2)Solution: Turn off the power supply and wait 20 minutes, the safety device will restart, and the sewing machine will be ready to start work.
2.The needle does not go.
1)Possible Reasons: The upper thread is used up; the presser foot is not lay down; the shuttle shaft is not in the correct position.
2)Solution: Replace the empty spool, re-recognize the needle; lower the presser foot; press the shuttle shaft to the bottom and return to the left, lower the buttonhole.
3.Sewing machine stops when it starts.
1)Possible Reasons: The presser foot does not match, or the needle strikes the presser foot; the needle falls off and snaps into the crochet.
2)Solution: Replace the presser foot, remove the needle and install a new needle.
4.Upper thread break.
1)Possible Reasons: Improper threading mode; thread knotting; excessive thread tension; needle bending, blunt tip or blisters; needle type is not suitable; needle placement is not appropriate; needlework mismatched; sewing initial speed is too fast; threading without thread pick-up device.
2)Solution: Threading normally; eliminate knotting; adjust clamp pressure; replace the needle of the appropriate type; properly place the needle; change the thread or change the needle; start the sewing machine at medium speed and check the step of going line.
5.Bottom thread break.
1)Possible Reasons: The shuttle core is not fully inserted into the shuttle shell; the shuttle core is wound by wires; the shuttle core does not work smoothly in the shuttle shell; the shuttle shell or shuttle has yarn.
2)Solution: Carefully reload the shuttle core into the shuttle shell, tidy up the shuttle shell outlet, check that the shuttle core whether be damaged; clean up the shuttle shell and the shuttle core.
6.Wire jumper.
1)Possible Reasons: Excessive thread tension; needle bending or blunt; needle type is not suitable; needle thread is mismatched; threading without thread pick-up device; foot pressure is insufficient; needle placement is inappropriate.
2)Solution: Adjust the thread tension, replace the needle, select the appropriate needle, replace the needle or use the thread, check the threading step, increase the pressure of the presser foot, re-thread the needle.
7.Stitches are unqualified.
1)Possible Reasons: The machine cable is not fully pulled into the sensor; the threading method is incorrect; the shuttle shell is out of line incorrectly; the bobbin cap does not match the size.
2)Solution: Fully pull the sensor into the sensor; properly threading; correcting the shuttle shell outlet; use the size-matched shaft cap.
8.Stitches are order-less.
1)Possible Reasons: The needle type is not matched; the step of going line is wrong; the tension plate is slack; strongly pull the fabric; the presser foot is insufficient or completely slack; the shuttle core is deformed.
2)Solution: Select suitable needles for thread and fabric, re-apply the thread on the machine, tighten the gripper, gently feed the fabric without pulling it, tighten or reload the presser foot, rewind the shuttle core.
9.Fabric wrinkling.
1)Possible Reasons: The stitches are too large for a particular fabric; needle tip is passivated; thread tension is not suitable; foot pressure is insufficient; the fabric is too light and thin; the wire diameter or the bottom thread diameter or material difference is used.
2)Solution: Shrink the stitches, replaced the needle, adjust the thread tension, increase the presser foot pressure, use the thin material backing paper, use the upper thread and the bottom thread which are of the same diameter.
10.Stranded wire.
1)Possible Reasons: The upper thread or the bottom thread have not been pressed by foot; feed dogs sink.
2)Solution: Simultaneously press the upper thread or the bottom thread against the presser foot, lift the feed dogs.
11.Needle Broken.
1)Possible Reasons: Fine needle sewing thick material; Needle installation is not sufficient; Needle fastening screw is loose; Improper presser foot; Loose presser foot.
2)Solution: Change the needle, re-install the needle, tighten the needle to fix the thread, select the applicable presser foot, re-install the presser foot.
12.Too much noise; click, machine crushing.
1)Possible Reasons: Feed dogs are filled of the debris ; the shuttle tip has a yarn; the wire is around the shuttle.
2)Solution: Clean the machine; disassemble and clean the shuttle.
13.Machine does not feed.
1)Possible Reasons: Set the stitch length to 0; The presser foot is too slack; the position of feed dogs is too low; The fabric knots under the thread.
2)Solution: Reset the appropriate pin mode and length, adjust the presser foot pressure to “normal”, lift the feed dogs, place the double wire below the presser foot before starting sewing.
14.Unable to thread the needle; The threader does not move; Threading does not go through the needle eye.
1)Possible Reasons: The needle is not in the highest position; The needle protector is self-protecting when the needle is not in place; The machine needle is not fully installed in place.
2)Solution: Rotate the hand-wheel until the needle reaches the highest position, fully insert the needle.
15.The threader does not return, the sewing machine stops; The threading hook stays in the needle eye.
1)Possible Reasons: The sewing machine accidentally moves while the threading hook is still in the eye of the needle.
2)Solution: Jog the hand-wheel clockwise and remove the hook.