What are the easy faults and treatment methods of computer sewing machine?

Boot without power:

First, in the case of ensuring that the power plug is plugged in, check whether the power switch is in good contact and whether the fuse on the power plate has been burned. If the above two items are all good, it is 15W/20 Ω on the power plate. The cement resistance is damaged. Just replace a resistor with a similar resistance. The circuit board with small resistance to cement resistance is vulnerable to damage caused by the impact of high current, and the circuit board with excessive resistance is slow to start when starting.

There is no action on the rewind pin, tangent, sweep wire and other execution components:

If there is no action in one of them, such as no return needle, first confirm whether the reverse seam switch is turned on, whether the electromagnet is burned, whether the corresponding plug-in is inserted, whether the electromagnetic wire is worn off by the pulley, or whether it is the control plate. The return needle loop failed. If the rewind pin switch is damaged, or if all the actuators such as the rewind pin tangent, sweep wire, etc. have no action(make sure all the function switches are on), first check whether the corresponding plug-in is inserted. Because the plugs of the rewind pins, tangent, sweep wires, and other execution components of most brand sewing machines are designed on a plug-in, they may be mistakenly dialed down. If the plug-in is good, it should be checked whether the 30VA fuse on the control board has been burned. Now some brands have replaced the iron-core induction Transformer with an electronic Transformer, although it has reduced weight, reduced volume, and reduced costs. But it also increases the likelihood that the transformer will break easily. Sometimes the fuse is good. It may be that the electronic Transformer is damaged. At this time, you can use the multimeter to measure whether the input power plug is 30V.

Computer needle machine sewing machine cutting line:

As long as you hear the tangent line, you will soon think that the cutter is blunt. If you change the cutter or cut the line, you will think that it is not the position of the tangent cam. In fact, the knife and knife used under normal circumstances are not so blunt. The reason why the new machine does not cut the line is 80 % because the belt is too loose, or the motor wheel and the handwheel are wrapped around the thread, so that the belt is slipped., causing the stop pin position is not accurate, In serious cases, when the needle is ready to cut after parking, the needle should be placed in the position of stopping the needle, but the needle can go to the top of the needle plate(when the pin position is stopped, if the pin is set up, the needle is on the needle plate. However, when the tangent is more than one stitch), at this time, the clipping electromagnet absorbs the clipping cam roller to the clipping position, and the knife will not retreat, causing the machine to cut the line continuously. The knife often cuts the needle, in fact, because the belt slips, the clipping cam roller is stuck in the clipping cam on the second stroke, so that the needle is under the needle plate, and the knife retreats and cuts the needle.