ethods as below: 1. Change the needle first. 2. Drop the feeding teeth and see if there is pressure on the presser foot. 3. Open the two screws on the needle plate to remove the needle plate and follow: (1) Shake the handwheel on the right side and shake the needle bar to the lowest position (wh......
Read More1. Wipe all parts of the machine first; compete and check if the fastening parts between the parts are loose. 2. Check whether the oil L is unobstructed and lubricate according to the lubrication requirements. 3. Check whether there are any obstacles in each moving part, whether the protective dev......
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