In the absence of any schematic diagram to a relatively strange injection molding machine circuit board repair, the so-called "experience" in the past difficult to accomplish, despite the hard-working people full of confidence in the maintenance of repair, but if the method is not correct, it works up Do more with less. So, what can we do to improve serviceability? Method one: look at the amount of After using tools: multimeter, magnifying glass When holding a circuit board to be repaired injection molding machine, good habits first of all should be its visual inspection, if necessary, but also with a magnifying glass to see what? Mainly to see: 1, whether there is a broken line; 2, discrete components such as resistors, electrolytic capacitors, inductors, diodes, transistors, etc. there is a disconnection; 3, injection molding machine circuit board PCB connection line is broken, Etc .; 4, whether someone repair it? Moved what components? Whether there are Weld, leak welding, insert reverse and other operational mistakes; After determining the condition was repaired above, first with a multimeter measuring injection molding machine circuit board power and ground resistance, if the resistance is too small, Only a few or a dozen ohms, indicating injection molding machine circuit board components have been breakdown or partial breakdown, we must take measures to be breakdown of the components to find out. The specific method is to be repaired circuit board power supply, touch the temperature of each device on the injection molding machine circuit board, the hot object will be the key suspects. If the resistance is normal, with a multimeter measuring board resistance, diodes, transistors, FETs, dial switch and other discrete components, the purpose is to ensure that the first measurement of the components is normal, our reason is that the use of multimeter Solve the problem, do not complicate it. Method two: first use after the tool: Circuit repair instrument If the situation allows, it is best to find a plate with the same repair board as a reference, and then use the double rod VI curve scanning function together on the two boards , Bad contrast test, the starting point of comparison can start from the port, and then from the table, especially for the capacitance of the test, you can make up for multimeter online difficult to detect whether the leakage of the shortcomings. Method three: easy to use after the first easy to use tools: circuit repair instrument online, electric iron, marker pen to improve the test results before the on-line functional test of the injection molding machine circuit board, board repair board to do some technical treatment to minimize weakness Disruptions have a negative impact on the testing process. Specific measures are: 1, the preparation of the test before the crystal oscillator short circuit, a large electrolytic capacitor to be welded to the next foot open, because the capacitor charge and discharge can also cause interference. 2, using the exclusion method of testing the device On-line test or comparison of the device, the test (or more normal) of the device, please confirm the test results directly for recording; test failed (or more tolerance) , You can test again, if still not passed, but also confirm the test results, so keep testing until the device on the board test (or comparison) finished, and then go back and deal with those who failed the test (or comparison Ultra poor) device. For devices that fail the function test online, the instrument also provides a less formal but more practical method of handling. Since the power supplied by the instrument to the circuit board of the injection molding machine can be applied to the corresponding power and ground of the device through the test clip The device power supply pin cutting edge, the device will leave the injection molding machine circuit board power supply system, then the device for online functional testing, injection molding machine circuit board due to other devices will not interfere again, the actual test The effect is equivalent to "quasi-offline", the accuracy rate will be greatly improved. 3, ASA-VI curve scan test to test the library has not yet covered the device to compare the test ASA-VI smart curve scanning technology can be applied to any device to compare the test, as long as the test clip can clip the device, then a reference Board, through the comparative test, the same device has a strong fault detection capability. This function makes up for the lack of testing function of the on-line function test of the device, and expands the detection range of the instrument on the fault of the circuit board of the injection molding machine. In reality, there are often situations where a good board can not be found for reference, and there is no symmetry in the circuit structure of the board to be repaired. In this case, the ASA-VI curve scan comparison test function does not work, and the online function test As the device test library is not complete, can not be completed on the injection molding machine circuit board for each device are tested again, the injection molding machine circuit board still can not repair, here is the limitations of the circuit repair instrument, just as there is no cure . Method four: the first static after the move Because the circuit online repair instrument currently on the injection molding machine circuit board device features online test and static characteristics of the analysis, is completely repaired must go through the machine test, therefore, the best test First check whether the power supply of the equipment is correctly supplied to the injection molding machine circuit board as required.
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