How to quickly troubleshoot the fault of the TX2 placement machine MGCU-2?

Today, GeekValue will share with you the maintenance ideas of MGCU-2（03117531） for TX2 placement machine accessories

When the placement machine is working, the MGCU-2（03117531） is often damaged due to unstable temperature and humidity in the workshop or unstable voltage in the workshop. Therefore, the power consumption and temperature and humidity of the SMT should be checked frequently to eliminate some possible faults. Dropped, today I will share with you the handling methods and maintenance ideas when the MGCU-2（03117531） parts of the TX series placement machine are abnormal.

MGCU2 is composed of two boards: control board and power board

 1. The troubleshooting methods of the power board are as follows:

To check the main power supply of x2.p, first measure whether the DC 300V is short-circuited to ground - that is, to determine whether the three large voltage regulator filter capacitors are broken down. The positive 300v of the large capacitor is the input of the inverter circuit. The inverter circuit is composed of 6 IGBTs (high-power mos tubes). A diode is connected in parallel between the CE poles of each IGBT. Each G pole is controlled by a second-order calculus modulator and a current linear driver, and every two IGBTs connected to CE output a phase voltage (U, V, W); 6 IGBTs need to be removed when checking the inverter circuit Measure whether it is good or bad, and each control chip can also judge whether it is normal through static measurement method.

2. The troubleshooting ideas of the control board are as follows:

1) Measure whether the canbus transceivers (4 in total) are functioning properly, that is, whether each logic pin is short-circuited.

2) Measure whether there is a short circuit in the main control microprocessor (BGA). Generally, many capacitors are connected to the back of the BGA. Use the buzzer of the multimeter to measure whether there is a short circuit. If there is a short circuit, it means that the BGA has been damaged. Professional disassembly.

3) In addition, there are a large number of bus data transmission chips/op amps/comparators on the control board. With the help of the IC datasheet, it is possible to troubleshoot one by one, which takes a long time.

4) The 24v to 3.3v/5v power supply chip is also located on the control board. The power supply of the main control chip is 2.5V, so there are two 5v to 2.5v buck step-down chips and voltage regulator chips to meet the main control IC. The power supply is stable.

After all the above fault points are detected and the maintenance is OK, it is time to test on the machine. This is the maintenance idea of Xlin-smt for the TX2 mounter MGCU-2（03117531）. If you have different opinions, welcome to exchange! Xlin-smt is a company specializing in providing one-stop solutions for placement machines. It has been deeply involved in the placement machine industry for 15 years, providing placement machine sales, leasing, spare parts supply, equipment maintenance, board motor maintenance, flying Up to maintenance, patch head maintenance, technical training of a full range of business!