Brother International PR1050X Operation Manual - Page 128

■ Upper thread is too tight The tension of the upper thread is too tight, resulting in the bobbin thread being visible from the right side of the fabric. ■ Upper thread is too loose The tension of the upper thread is too loose, resulting in a loose upper thread, loose thread locks or loops appearing on the right side of the fabric. 1 Right side 2 Wrong side Turn the knob in the direction of the arrow to decrease the tension of the upper thread. 1 Right side 2 Wrong side Turn the knob in the direction of the arrow to increase the tension of the bobbin thread. 1 Red line If the red line is visible, the thread tension cannot be decreased any further. Increase the tension of the bobbin thread. For details, refer to page 124. Note • If you decrease the thread tension further than the red line, the tension knob may be disassembled. • If necessary, refer to page 287 for reassembling the tension unit. 126