Brother International BAS-300G Instruction Manual - English - Page 81
TROUBLESHOOTING, Problem, Cause, Remedy, Reference, Upper thread breaks., Skipped stitches occur.
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12. TROUBLESHOOTING Problem Upper thread breaks. Cause Upper thread tension is too strong. Remedy Adjust the upper thread tension. Reference P. 24 Needle is incorrectly installed. Install the needle correctly. P. 20 Thread is too thick for the needle. Select a thread that matches the needle. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Damage or burring of the rotary hook, needle hole plate, needle or thread path. Repair or replace the problem part. Thread breaking from heat (Synthetic thread) Use a needle cooler. Thread is threaded incorrectly. Lower thread breaks. Lower thread tension is too strong. Thread the thread correctly. Adjust the lower thread tension. Damage to the needle hole plate or bobbin case. Repair or replace the problem part. Skipped stitches occur. Clearance between needle and rotary hook tip is too great. Adjust the needle clearance. Needle and incorrect. rotary hook timing is Adjust the needle bar lift amount. The driver is covering the needle more Adjust the needle contact pressure of than necessary. the driver. Needle is bent. Replace the needle. P. 24 P. 56 P. 20 P. 20 P. 24 P. 58 P. 57 P. 57 Needle is broken. Needle is incorrectly installed. Install the needle correctly. Clearance between needle and rotary hook tip is too great. Adjust the needle clearance. Adjust the needle bar lift amount. P. 20 P. 58 P. 57 Thread jamming. Needle is bent. Replace the needle. Needle deflection Needle is too thin. Select a needle that is suitable for the sewing conditions. Reduce the sewing speed. Select a needle that is suitable for the sewing conditions. Thread take-up spring tension and Adjust the tension and height of the height are incorrect. thread take-up spring. Needle and incorrect. rotary hook timing is Adjust the needle bar lift amount. P. 24 P. 24 P. 56 P. 57 BAS-300G, BAS-311G, BAS-326G 72