Brother International DB2-B791 Service Manual - Page 8

5. Stitch length • While pushing the reverse feed lever 0 halfway down, turn the dial ® until the desired number is aligned with the pin© at the top, and release the reverse feed lever 0. ).'< The larger the number is, the longer the stitch length is. • The reverse stitching device is an automaticresetting type; a material is fed in reverse when the reverse feed lever 0 is pressed, and forward again when it is released. 6. Thread tension Stitches when the needle thread tension is too low S Shorter r Less tension Longer More tension Stitches when the needle thread tension is too high Correct stitches ti• Less tension More tension Adjust the needle thread length after the thread is trimmed to 35-40 mm by turning the tension control nut 0. Adjust the bobbin thread tension by turning the spring adjusting screw so that the bobbin case does not slip down of its own weight from the bobbin thread when it is suspended from the end of the thread held by hand. After lowering the presser foot, adjust the needle thread tension by turning the tension nut ®. 7-10 mm Higher Lower • 0 25-30 g ire Less tension IT More tension [Thread take-up spring] • The standard operation height of the thread take-up spring is 7-10 mm. To adjust the height of the thread take-up spring, loosen the screw and turn the upper tension regulator bracket assembly. • The standard tension at this time is 25-30 g. To adjust the thread take-up spring tension, turn the tension stud© using a screwdriver. 0 -5-