Brother International BAS-300G Instruction Manual - English - Page 80
Troubleshooting
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12. TROUBLESHOOTING 12. TROUBLESHOOTING • Please check the following points before calling for repairs or service. • If the following remedies do not fix the problem, turn off the power switch and consult a qualified technician or the place of purchase. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting. If the foot switch is depressed by mistake, the sewing machine might start operating and injury could result. Problem Cause Remedy Reference Work clamp does not lift. Work clamp does not drop. Work clamp lift amount is incorrect. Work clamp does not lift to the maximum height. Work clamp moves stiffly. Air tube of presser lifter cylinder is bent or damaged (pneumatic work clamp specifications). Work clamp lift amount setting at operation panel is incorrect (motor-driven work clamp specifications). Work clamp arm lever position is incorrect. (pneumatic work clamp specifications) Work clamp arm stopper position is incorrect (motor-driven work clamp specifications). Cylinder joint position is incorrect. (pneumatic work clamp specifications) Apply a suitable amount of grease to the sliding parts of the work clamp. Straighten the bend in the tube or replace the tube. Change the work clamp lift amount setting. Adjust the position of the work clamp arm lever. Adjust the position of the stopper. Adjust the position of the cylinder joint. Thread wiper does not operate correctly. The thread wiper is obstructing the needle. Adjust the height of the thread wiper. Adjust the stroke of the thread wiper. P. 31 P. 66 P. 63 P. 63 Thread wiper position is incorrect. Adjust the stroke of the thread wiper. Lower thread winds Bobbin winder tension assembly height Adjust the height of the bobbin winder to one side. is incorrect. tension assembly. Lower thread winding amount is incorrect. Bobbin presser position is incorrect. Adjust the position of the bobbin presser. Thread slips out of the needle. Stitches being skipped at the sewing start. Refer to "Skipped stitches occur". Upper thread trailing length is uneven. Adjust the sub-tension. P. 63 P. 22 P. 22 P. 72 P. 24 71 BAS-300G, BAS-311G, BAS-326G