Issue link: https://docs.hic.us/i/445658
214 Chapter 11 Troubleshooting 1-2. When the machine does not sew well (1) Case to be conducted by the customer Thread breakage Needle breakage Bad finishing of sewing Cause Corrective Action Bad thread tension Adjust tension. Upper thread (120 to 140 g), under thread (20 to 30 g) Quality of thread is bad. Poor thread flow Use good quality thread. Use silicone. Direction of needle is bad. Bent Adjust to face to the front or to the right a bit. Replace. Applique glue is stuck on needle. Remove adhered glue. Contamination, run-out of oil of rotary hook Clean and lubricate.(→p.218) Many fine stitches of 0.5 mm or less in design data Remove fine stitch(es).(→p.93) The fabric is lifted too much against the needle plate. The fabric touches the needle plate excessively. Stretch the fabric again so that it touches needle plate lightly. Run-out of oil of needle bar Grease.(→p.220) There is a scratch on the thread course. Grind a scratch with sandpaper etc. Replace. Bad height of presser foot Perform adjustment so that height fits to fabric/material. Frame drive timing does not fit to embroidery condition. Change setting.(→p.170) Cause Corrective Action Bad thread tension Adjust tension. Upper thread (120 to 140 g), under thread (20 to 30 g) 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. Quality of needle is bad. It does not fit to embroidery condition. Use good quality needle. Use needle that fits to embroidery condition. Vibration of the machine is big. Center support is too much touched to the table. Tighten the support by hand. Adjust leveling. Frame drive timing does not fit to embroidery condition. Change setting.(→p.170) Cause Corrective Action Bad thread tension Adjust tension. Upper thread (120 to 140 g), under thread (20 to 30 g) Quality of thread is bad. Poor thread flow Use good quality thread. Use silicone. QS04