Brother International RH-981A Instruction Manual - English - Page 87
Troubleshooting
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13. TROUBLESHOOTING 13. TROUBLESHOOTING If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed. CAUTION Turn off the power switch and disconnect the power cord before carrying out troubleshooting, otherwise the machine will operate if the start switch is pressed by mistake, which could result in injury. MACHINE HEAD Problem Thread breaks. Skipped stitches occur. Needle breaks. Cause Remedy Thread tension control nut Adjust to an appropriate pressure is too strong. pressure. Thread is of poor quality. Use a better-quality thread. Thread is too thick for the Use a differently-size needle. needle. Needle groove or needle hole are not smooth. Replace with a new needle. Needle and looper adjustment is Adjust the needle bar height or incorrect. the looper and spreader height. Needle, looper, throat plate or thread path is damaged. Repair the damage with an oilstone or buffer, or replace the damaged part. Thread tension control nut pressure is too strong or too weak. Adjust to pressure. an appropriate Needle point is broken or bent. Replace with a new needle. Needle and looper adjustment is incorrect, or clearance is Adjust correctly. incorrect. Needle and needle adjustment is incorrect. Looper tip is blunt. Needle is bent. guard Adjust correctly. Repair with an oilstone or replace the looper with a new one. Replace with a new needle. Needle and looper adjustment is Adjust the needle bar height or incorrect. the looper and spreader height. Needle and needle adjustment is incorrect. guard Adjust correctly. Page 47 28 55 47 28 56 59 28 55 59 RH-981A 80