Brother International HE-800A Instruction Manual - English - Page 106

16. TROUBLESHOOTING Uneven seams (10) ...... All stitches Cause Threading Thread path Check Upper thread threading Lower thread threading Flaw or abrasion on the thread path Remedy Thread the upper thread correctly. Thread the lower thread correctly. Polish with buff or replace the part. Especially, pay attention to finishing around needle plate hole. Page 58 60 - Needle Thread chips or dust Upper thread Rotary hook holder Needle plate hole Needle installation Needle size Rotary hook rim Rotary hook edge Around needle plate hole Upper thread tension Thread and needle Flaw on the rotary hook holder Insert needle fully into needle bar Replace needle with thicker one. Remove thread chips or dust 3996Q Increase upper thread tension while checking stitches. Replace needle with one that fits for the thread. Polish with buff or replace the part. Check flaw here 57 69, 71 62 - - Adjust the rotary hook overlap amount. 3997Q Rotary hook Rotary hook holder and Adjust the rotary hook holder and inner rotary hook inner rotary hook overlap overlap amount. 74 amount Rotary hook lubrication Decrease the quantity of lubrication oil. * Note that if you reduce the amount of oil too much, 26 thread breakages may occur. Bobbin winder guide Bobbin thread tension Adjust the tension on the bobbin winder guide. - Uneven bobbin winding Move bobbin winder tension bracket up and down to adjust. 59 Lower thread Lower thread tension Adjust the lower thread tension. 61 Bobbin case Damaged outside of Polish with buff or replace the part. bobbin case and bent * Use the HE-800A bobbin case. - bobbin holder spring, etc. Stitch patterns Purl stitch, whip stitch Set using parameter number 11. 37 HE-800A 98