Brother International RH-981A Instruction Manual - English - Page 88
Lower thread is not cut.
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13. TROUBLESHOOTING Problem Cause Remedy Upper thread is not cut. Knife is blunt. Replace with a new knife. Knife does not move to the full stroke because air pressure is Adjust the air pressure. too weak. Upper thread trimmer knife is not picking up the upper thread. Install the upper thread trimmer knife so that it cuts only one side of the upper thread loop. Lower thread is not cut. Movable knife is not picking up Refer to the remedies given the needle thread because the under "Skipped stitches occur" last stitch is being skipped. in this troubleshooting chart. Movable knife incorrect. position is Adjust the position of the movable knife or the loop spreader. Knife is blunt. Replace with a new knife. Knife does not move to the full stroke because air pressure is Adjust the air pressure. too weak. Movable knife incorrect. position is Adjust the position of the movable knife or the loop spreader. Thread slips out of the Thread nipper spring force is too Adjust the force of the thread needle at the sewing start. weak. nipper spring. Upper thread length is too short after trimming. Install the upper thread trimmer knife so that it cuts only one side of the upper thread loop. Needle and looper adjustment is Adjust the needle bar height or incorrect. the looper and spreader height. Not enough upper thread is Adjust the amount of upper being fed out. thread being fed out. Material cleanly. is not being cut Cutting pressure is too weak. Adjust the cutting pressure so that it is strong enough. Knife and hammer contacting properly. are not Grind the hammer surface. Knife is blunt. Replace with a new knife. Page 63 63 66 80 66, 67 63 63 66, 67 66, 67 66 55 57 63 62 63 RH-981A 81
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