◆Adjust top dead center

◆Replace top dead center

◆Check the black adhesive

◆The needle stops on the single needle bar

◆Check whether the machine head is locked

◆Whether electromagnet will suck in and out of the machine when it is switched on(Switch to the 9th pin and turn on the electromagnet outside to boot)

◆Whether the position of electromagnet is correct

◆Whether the vinyl is damaged（Switch colors to the ninth to check)

◆Check the upper dead point on the pin

◆Check the position of the silver arm and the iron CAM

◆Single head jumping is bad(Sometimes it takes a couple of jumps to get the needle properly)

◆Black adhesive

◆Electromagnet position

◆Top dead center

◆The machine head (needle bar rack) whether to loosen the needle bar press down very tight cargo can not automatically bounce back

◆Presser foot stuck

◆Needle bar deformation(Compared by line position)

◆The upper and lower dead points crash with needle bar guide(Adjust the screws of upper and bottom dead point)

◆The needle bar is too tight

◆Presser foot of single machine head is missing

◆Confirm whether the electromagnet has action when shutdown. If no, a> electromagnet plugs loose; B > electromagnet line breaks off; C > surface inspection plate is damaged; D > electromagnet is damaged

◆The electromagnet is loose, or not in position

◆Black adhesive is damaged or it has serious wear and tear on contact with electromagnet

◆Presser foot of single machine head is missing

◆Upper spring is broken

◆Check black adhesive

◆Presser foot of upper dead point is missing

◆Jumping fuse is fired

◆Power plate is damaged

◆Decoding board

◆The head of machine signal is broken