Instruction Manual
Page 20
...needle plate. ra Adjust the needle bar lift stroke and height. Refer to "Upper Threading" 7 Install the needle in the supplementary instruction manual. Polish the rotary hook point. Improper upper thread tension. Bobbin sticks. z 8 Insufficient lubrication to 0.05 mm. Needle bar lift... stroke and tension. Adjust the lubricating oil supply to 0.2 mm. Bent or blunt needle. Rotary hook point damaged. mentary instruction manual. Set the rotary hook arid bobbin case opener gap to the rotary hook. Improper thread take -up spring tension and stroke...
...needle plate. ra Adjust the needle bar lift stroke and height. Refer to "Upper Threading" 7 Install the needle in the supplementary instruction manual. Polish the rotary hook point. Improper upper thread tension. Bobbin sticks. z 8 Insufficient lubrication to 0.05 mm. Needle bar lift... stroke and tension. Adjust the lubricating oil supply to 0.2 mm. Bent or blunt needle. Rotary hook point damaged. mentary instruction manual. Set the rotary hook arid bobbin case opener gap to the rotary hook. Improper thread take -up spring tension and stroke...