Brother International BAS-761 Instruction Manual - English - Page 19

5-5. Thread tension q r Stitches when upper thread tension is too low s x2.4 rotary hook Stitches when upper thread tension is too high 5. Correct operation e Correct stitches s x2.4 rotary hook w Low High s x1.7 rotary hook w Low High s x1.7 rotary hook e 1. When the thread take-up lever is in the highest position after thread trimming, adjust the upper thread beyond the needle eye so as it is 30 to 40 mm long, by turning tension nut q. (30 - 70 g is standard). 2. Adjust the lower thread tension by turning tension regulating screw w. (40 - 60 g is standard.) 3. Adjust the upper thread tension by turning tension nut e and r after lowering the presser foot. Note: Then adjust the tension 30 - 40 g by turning tension nut r. Main adjust is performed by using tension nut e. ( ) x2.4 rotary hook 150 - 200 g is standard. x1.7 rotary hook 200 - 220 g is standard. s Thread take-up spring s x2.4 rotary hook e s x1.7 rotary hook e 30 - 60g w q 40 - 80g q 5 - 8mm 1. The standard height of the thread take-up spring q is when the stroke is 5 to 8 mm.In addition, the standard tension in the thread take-up spring is 30 g to 60 g (x1.7 rotary hook 40 - 80g). (The tension in the thread take-up spring when it is pulling the upper thread straight to the side at the point where the spring starts to move.) 2. To adjust the thread take-up spring height, loosen set-screw w and turn the whole unit of the tension regulator assembly. 3. To adjust the thread take-up spring force, insert a screwdriver tip into the groove of tension stud e and turn it as much as is appropriate. BAS-761 12