ethods as below: 1. Change the needle first. 2. Drop the feeding teeth and see if there is pressur...
1. Wipe all parts of the machine first; compete and check if the fastening parts between the parts a...
When picking, see if the machine head is bright, whether there is stripping and bumping, whether the...
The big machines will be packed by wooden case, the small machines will be packed by cartons.