Brother International RH-9820 Instruction Manual - English - Page 123
Troubleshooting
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11. TROUBLESHOOTING 11. TROUBLESHOOTING • If there is a problem with operation, first check that the threads are correctly threaded and that the needle is correctly installed. • 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. Otherwise the machine may operate if the start switch is pressed by mistake, which could result in serious injury. Problem Thread breaks Cause Remedy Thread tension is too strong. Adjust the thread tension to the correct tension. Needle is not installed correctly. Install the needle so that it faces correctly. Thread is too thick for the needle. Select a thread which is suitable for the needle. Needle and looper adjustment is incorrect. Adjust the clearance between the needle and looper, the needle bar height or the looper and spreader height. Needle, looper, spreader, throat plate or thread path is damaged. Repair or replace the respective part(s). Page 55 30 55 71, 78 79 Thread is not threaded correctly. Thread the thread correctly. 31 - 34 Skipped stitches occur. Upper thread tension is too strong or too Adjust the upper thread tension to the weak. correct tension. Needle point is broken or bent. Replace with a new needle. Clearance between needle and looper Adjust the clearance between the tip is incorrect. needle and looper tip. Needle, looper and spreader adjustment is incorrect. Adjust correctly. Needle and needle guard adjustment is incorrect. Adjust the needle guard. Looper tip is blunt. Repair with an oilstone or replace the looper with a new one. Needle is not installed correctly. Install the needle so that it faces correctly. Needle is too thin. Select a needle that is suitable for the sewing conditions. 55 79 71 76 - 81 79 30 55 RH-9820 114