Many maintenance personnel think that the most difficult part of robot maintenance is the fanuc circuit boards, which has a special, complex and delicate structure. In the maintenance process, professional maintenance tools are usually needed to carry out maintenance. Ordinary people may not understand this very well, this article introduces fanuc PCB circuit boards maintenance steps and matters needing attention.
To repair the original fanuc circuit board, first observe the appearance, if necessary with the help of a magnifying glass.
Focus on:
1. Whether there are wire breaks and short circuits; In particular, fanuc circuit control board printed board connection line is broken, adhesion and other phenomena;
2. Whether the relevant components such as resistance, capacitance, inductance, diode, transistor, etc. are disconnected;
3. Has anyone repaired it? Which components have been touched? Whether the existence of virtual welding, welding leakage, insert back insert wrong and other problems.
After the exclusion of the above situation, this time first use a multimeter to measure the resistance between the power supply of fanuc electronics circuit coard and the ground, usually the resistance of the robot circuit board should not be less than 70 ω. If the resistance is too small, only a few or a dozen ohms. Note If some components of the fanuc CPU board circuit are broken down or partially broken down, measures must be taken to find out the components that are broken down. The specific method is to be repaired by electric robot maintenance (attention! At this time, we must make clear the voltage value of the working voltage of the board and the positive and negative polarity, can not be connected wrong and add higher than the working voltage value. Otherwise repair robot circuit board will be treated with damage! Old faults have not been eliminated, and new problems have been added! The temperature of each component on the fanuc inverter circuit board is measured by point thermometer. The temperature rising faster and higher is regarded as the key suspect.
When the resistance value is normal, then use the multimeter to measure the components such as the two and three audions, the field effect tube and the dial switch on the board. The purpose is to ensure that the components that have been measured are normal. Don't complicate problems that can be solved with generic testing tools.
When testing, it is best to have a good fanuc servo amplifier circuit board as a reference, if possible, as the board to be repaired. Then the good and bad of the two plates were compared by using the double bar VI curve scanning function of the tester. The initial comparison test point can start from the port of the fanuc spare parts circuit board; Then from the outside to the inside, the capacitor is compared and tested. This can make up for the multimeter is difficult to detect whether the capacitor leakage defects.
During the testing, in order to improve the testing effect, some technical treatment should be done to the repaired board before the online functional test of the fanuc main assembly electronic circuit board main component, so as to minimize the influence of various interference on the test.
