Computer-controlled sewing machine accessories three major troubleshooting method

The emergence of a variety of sharp sewing equipment to the apparel industry has brought high economic benefits, improve the efficiency of the operator, but the machine failure seems to be an inevitable problem, and for computer-controlled sewing machine accessories, power-on does not power on, backward back to the needle, cut line, sweeping line faults, cut the line without failing to troublesome operators for a long time, then how to rule out the two major failures it?
1. If the power does not power on first, in the case of determining the power plug plugged in, check whether the power switch is in good contact, the fuse on the power supply board has not blown, if the above two are good, that is, the power board on the 15W/200 cement resistor is damaged, replace the value of a comparable resistor on the line. The cement resistor resistance value of a small circuit board is susceptible to high-current impact caused by damage, resistance value is too large circuit board, boot start slow!
2. the backward needle, cut the line, sweep the line and other executive elements are not moving
If one of the actions is not, such as no backward needle, first confirm whether the backward sewing switch is open, by the magnet is burned out, whether the corresponding connector is inserted electromagnet line is broken by the pulley grinding, or the control board backward needle circuit failure, if it is the backward needle switch is damaged, or the backward needle cutting, sweeping and other all the implementation of the elements are not action.

First of all, check whether the corresponding connectors of the computer-controlled sewing machine accessories are plugged in properly, because the plugs of the backward needle, thread cutting, thread sweeping and other executive elements of most brands of sewing machines are all designed on one connector, which may be dialed down by mistake. If the connector is good, you should check if the 30VA fuse on the control board is blown.
Some brands now replace the core induction transformer with an electronic transformer, which reduces weight, size and cost, but also increases the likelihood that the transformer will break easily. Sometimes the fuse is good, it may be that the electronic transformer is damaged, then you can use a multimeter to measure the control board input power plug is 30V!
3. the needle car accessories cut the line
As long as you hear the cut line, will soon think of the cutter blunt, change the cutter or cut line, will think of is not cut line cam position alignment, can be adjusted to adjust is not to find out the problem. In fact, under normal circumstances the use of the moving knife and fixed knife is not so easy to blunt, the company used 2 ~ 3 years of computer-controlled sewing machine accessories fixed knife used to this day has not been repaired.
It has been observed that the new machine cuts not line 80% of the reason is because the belt is too loose, or the motor wheel, handwheel wrapped around the line of debris, to make the belt slippery, resulting in the position of the needle is not allowed to stop the needle, serious times, after stopping the car ready to cut the line when the needle should be under the position of the needle should stop the needle, the needle but the needle above the needle plate, at this time, cut the line of the solenoid suction cut the line of the cam rollers can not be cut to cut the line of the position of the movable knife will not be back, resulting in the machine cut without thread.