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In order to improve the test effect, some technical processing should be done on the repaired board before online functional testing of the circuit board to minimize the negative impact of various interferences on the test process. The specific measures are
Preparation before testing
If the crystal oscillator is short-circuited, a leg must be soldered to a large electrolytic capacitor to open it because the charging and discharging of the capacitor can also cause interference.
Use the elimination method to test the device
During the online test or comparison process of the device, for any device that passes the test (or is relatively normal), please directly confirm the test results so that the device that fails the test (or is relatively normal) can be recorded. ) can be tested again. If it still fails, you can also confirm the test results first and continue testing until the devices on the board are tested (or compared), and then go back and deal with those that failed the test (or compared the components that are out of tolerance). device. The instrument also provides a less formal but more practical processing method for devices that fail to pass functional online testing. Since the power supply of the circuit board from the instrument can be applied to the corresponding power supply and ground pin of the device through the test clip, if the power supply pin of the device is When blade cutting is implemented, the device will be separated from the circuit board power supply system. At this time, the online functional test of the device will be carried out. Since other devices on the circuit board will no longer interfere, the actual test effect is equivalent to quasi-offline measurement accuracy, and the accuracy will be greatly improved. .
Use curve scan testing to perform comparative testing on devices that are not covered by the test library
Since smart curve scanning technology can be applied to comparative testing of any device, as long as the test clamp can clamp the device and a reference board passes Comparative testing also has strong fault detection capabilities for devices. This function makes up for the shortcomings of the device's online functional test, which is limited by the test library, and expands the instrument's detection range of circuit board faults. In reality, there are often situations where it is impossible to find a good board for reference, and the circuit structure of the board to be repaired does not have any symmetry. In this case, the curve scan comparison test function does not work, and the online functional test is due to the incomplete device test library. It is impossible to test every component on the circuit board and the circuit board still cannot be repaired. This is the limitation of the circuit online repair instrument, just like there is no cure-all medicine.
Method 4: Be static first and then move
Since the circuit online repair instrument can currently only conduct functional online testing and static feature analysis of the devices on the circuit board, whether it is completely repaired must be tested and inspected by the whole machine, so during the inspection It is best to first check whether the power of the device is supplied to the circuit board correctly as required.
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Xiamen Yingyi Automation Technology Co., Ltd.
Contact person: Fu Maoqiang
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