Brother International SB3150 Operation Manual - Page 124
Incorrect thread tension
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Troubleshooting While holding the thread lightly with your right hand, f pass the thread under the thread guide plate, and then pull it up. 1 Thread guide plate Pass the thread through the thread channel in the order g shown below. Incorrect thread tension ■ Symptoms • Symptom 1: The bobbin thread is visible from the right side of the fabric. (Refer to illustration below) • Symptom 2: The upper thread appears as a straight line on the right side of the fabric. • Symptom 3: The upper thread is visible from the wrong side of the fabric. (Refer to illustration below) • Symptom 4: The bobbin thread appears as a straight line on the wrong side of the fabric. • Symptom 5: The stitching on the wrong side of the fabric is loose or has slack. Symptom 1 1 Symptom 3 1 Shutter Lower the presser foot. h Press . i Slide the thread behind the needle bar thread guide. j The thread can easily be passed behind the needle bar thread guide by holding the thread in your left hand, then feeding the thread with your right hand, as shown. Make sure that the thread is passed through to the left of the tab of the needle bar thread guide. 2 1 1 Needle bar thread guide 2 Tab Next, use the needle threader to thread the needle. k Continue with the procedure in "Threading the needle" in the "Basic operations" section. 1 Wrong side of fabric 2 Bobbin thread visible from right side of fabric 3 Upper thread 4 Right side of fabric 5 Bobbin thread 6 Upper thread visible from wrong side of fabric ■ Cause/remedy/check details Cause 1 The machine is not correctly threaded. The bobbin threading is incorrect. Return the upper thread tension to the standard setting, and then refer to "Upper thread tightened up" on page A-4 to correct the threading. The upper threading is incorrect. Return the upper thread tension to the standard setting, and then refer to "Tangled thread on wrong side of fabric" on page A-5 to correct the upper threading. A-6