Instruction Manual
Page 20
...ra Adjust the needle bar lift stroke and height. Damaged needle hole in the feed dog. U Refer to p.7 of the Supplementary instruction manual. Bobbin sticks. z 8 Improper upper thread tension. Polish the rotating hook holding slot in the needle plate. Rotary hook point damaged.... Improper threading. Needle Replace the needle. Check that the needle plate and rotary hook gap is approx. 1.2 mm. mentary instruction manual. Refer to the rotary hook assembly. Improper thread take -up spring tension and stroke. Refer to "Upper Threading" 7 Install the ...
...ra Adjust the needle bar lift stroke and height. Damaged needle hole in the feed dog. U Refer to p.7 of the Supplementary instruction manual. Bobbin sticks. z 8 Improper upper thread tension. Polish the rotating hook holding slot in the needle plate. Rotary hook point damaged.... Improper threading. Needle Replace the needle. Check that the needle plate and rotary hook gap is approx. 1.2 mm. mentary instruction manual. Refer to the rotary hook assembly. Improper thread take -up spring tension and stroke. Refer to "Upper Threading" 7 Install the ...