Issue link: https://docs.hic.us/i/445631
220 Trouble examples and Corrective actions Chapter 9 QS10 2-2. Needle breaks. If the followings seem to cause the trouble, please ask the distributor for information. (a) Abrasion of needle catcher of rotary hook. The gap between needle and hook point is not suitable. (b) A play of needle bar case (in right and left direction) is big. (c) The floor vibrates. There is a play on the fringe of the frame. 2-3. Bad finishing of sewing If the followings seem to cause the trouble, please ask the distributor for information. (a) There is a play on the fringe of frame. (b) Abrasion and breakage of neighboring parts of take-up lever drive and needle bar drive. (c) Bad take-up lever timing. (d) Belt tension of drive system is too strong or too weak. (e) Setting for the machine does not match to the embroidery condition. Cause Troubleshooting Bad thread tension Adjust tension. Density of design data is very high. Correct data. Delete unnecessary underlay stitching. The material is too thick or hard. Use material suitable for embroidery. Bobbin is deformed and it touches the needle. Replace the bobbin. Bad quality of needle, mismatching to embroidery condition Use good quality needle. Use needle that fits to embroidery condition. Vibration of the machine is big. Adjust leveling. Cause Troubleshooting Bad thread tension Adjust tension. Quality of thread is bad. Poor thread flow Use good quality thread. Spray silicone. Density of design data does not match with material and/or thread. Correct data. Bad frame attaching and fixing of the fabric Attach the frame correctly. Fix the fabric firmly. Thread, needle and/or size of needle plate do not match with embroidery. Make combination that fits to design data/material. R.P.M. is too high. Decrease R.P.M.