排除上述狀況后，這時(shí)候先用萬(wàn)用表測(cè)量機(jī)器人電路板電源與地之間的阻值，通常機(jī)器人電路板的阻值不應(yīng)小于70Ω。若阻值太小，才幾或十幾歐姆。說(shuō)明機(jī)器人電路板上有元器件被擊穿或部分擊穿，就必須采取措施將被擊穿的元器件找出來(lái)。

（注意！此時(shí)一定要搞清該板的工作電壓的電壓值與正負(fù)極性，不可接錯(cuò)和加入高于工作電壓值。否則將對(duì)待修機(jī)器人電路板有傷害！老故障沒(méi)排除，又增新毛?。∮命c(diǎn)溫計(jì)測(cè)機(jī)器人電路板上各器件的溫度，溫度升的較快較高的視為重點(diǎn)懷疑對(duì)象。若阻值正常后，再用萬(wàn)用表測(cè)量板上的阻容器件二、三極管，場(chǎng)效應(yīng)管，以及撥段開(kāi)關(guān)等元器件。其目的就是首先要確保被測(cè)量過(guò)的元器件是正常的。能用一般測(cè)試工具（如萬(wàn)用表等）解決的問(wèn)題，就不要把它復(fù)雜化。

二、先外后內(nèi)

使用進(jìn)行檢測(cè)時(shí)。如果情況允許，好是有一塊與待修板一樣的好機(jī)器人電路板作為參照。然后機(jī)器人維修使用測(cè)試儀的雙棒VI曲線掃描功能對(duì)兩塊板進(jìn)行好、壞對(duì)比測(cè)試。開(kāi)始的對(duì)比測(cè)試點(diǎn)可以從機(jī)器人電路板的端口開(kāi)始；然后由表及里，尤其是對(duì)電容器的對(duì)比測(cè)試。這可彌補(bǔ)萬(wàn)用表在線難以測(cè)出電容是否漏電的缺憾。

三、先易后難

使用進(jìn)行檢測(cè)時(shí)。為提高測(cè)試效果，在對(duì)機(jī)器人電路板進(jìn)行在線功能測(cè)試前，應(yīng)對(duì)被修板做一些技術(shù)處理，以盡量削弱各種干擾對(duì)測(cè)試過(guò)程中帶來(lái)的影響。具體措施如下：

1.測(cè)試前的準(zhǔn)備

將晶振短路（注意對(duì)四腳的晶振要搞清那兩腳為信號(hào)輸出腳，可短路此兩腳。記住一般情況下另外兩腳為電源腳，千萬(wàn)不可短接！！），對(duì)于大容量的電解電容器，也要焊下一腳使其開(kāi)路。因?yàn)榇笕萘侩娙莸某浞烹娡瑯右矔?huì)帶來(lái)干擾。

After the above conditions are eliminated, at this time, use a multimeter to measure the resistance between the power supply and ground of the robot circuit board. Generally, the resistance of the robot circuit board should not be less than 70 Ω. If the resistance is too small, it is only a few or more ohms. It shows that if the components on the robot circuit board are broken down or partially broken down, measures must be taken to find the broken down components.
(note! At this time, be sure to make clear the voltage value and positive and negative polarity of the working voltage of the board, and do not connect wrongly or add higher than the working voltage value. Otherwise, the robot circuit board to be repaired will be damaged! The old faults have not been eliminated, and new faults will be added! Use a dot thermometer to measure the temperature of each device on the robot circuit board, and the one with a faster and higher temperature rise will be regarded as the key suspect. If the resistance value is normal, use a multimeter to measure the resistance and capacitance devices II and III on the board Transistor, FET, and toggle switch and other components. The purpose is to ensure that the measured components are normal. Don't complicate problems that can be solved with general testing tools (such as multimeter, etc.).
2、 From outside to inside
When using for detection. If circumstances permit, it is best to have a good robot circuit board as the same as the board to be repaired as a reference. Then the robot maintenance uses the dual bar VI curve scanning function of the tester to conduct a good and bad comparison test on the two boards. The starting comparative test point can start from the port of the robot circuit board; Then from the outside to the inside, especially the comparative test of capacitors. This can make up for the defect that it is difficult for the multimeter to detect whether the capacitor is leaking electricity online.
3、 Easy before difficult
When using for detection. In order to improve the test effect, some technical treatment should be done to the repaired board before the online function test of the robot circuit board, so as to minimize the impact of various interferences on the test process. Specific measures are as follows:
1. Preparation before test
Short circuit the crystal oscillator (note that for the four pin crystal oscillator, make sure that the two pins are signal output pins, and short circuit these two pins. Remember that the other two pins are power pins in general, and do not short circuit!!), For large capacity electrolytic capacitors, it is also necessary to weld the next leg to make it open circuit. Because the charge and discharge of large capacity capacitors will also bring interference.