How to find a PCB line board failure.Transformer T PCB price_

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How to find a PCB line board failure.Transformer T PCB price

source:Industry News release time:2023-06-13 Article author:yu Popular:pcb

　　

How to find a PCB line board failure.Transformer T PCB price(图1)

　　1. Measure the voltage method to find a fault PCB board

　　First of all, it is necessary to confirm whether the voltage of each chip's power pins is normal. Secondly, check whether the various reference voltage is normal, and whether the working voltage of each point is normal. For example, when the general silicon trial pipe is turned on, the BE knot voltage is about 0.7V, and the CE knot voltage is about 0.3V or smaller. If the BE knot voltage of a triode is greater than 0.7V (except for special triode, such as the Darlingon tube, etc.), it may be that the BE knot opens.

　　2. Signal injection method to find fault PCB board

　　Add the signal source to the input terminal, and then measure the waveforms of each point later to see if it is normal to find the fault point. Sometimes we also use a simpler way, such as holding a tweeter with your hands to touch the input end of the inputs at all levels to see if there is a response from the output end. This is often used in audio and video amplification circuits. This method cannot be used in circuits or high voltage circuits, otherwise it may lead to electric shock). If there is no response in the first level, and if there is a response after the first level, it means that the problem is the previous level, and the key inspection should be checked.

　　3. Other methods to find fault PCB boards

　　There are many other ways to find fault points, such as watching, listening, smelling, touching, etc.

　　"Look" is to see if there are obvious mechanical damage to the components, such as rupture, black burning, deformation, etc.;

　　"Listening" is to listen to whether the work sound is normal. For example, something that should not be ringing is ringing, the place where the sound should not sound or the sound is not normal;

　　"Wen" is to check whether there is a odor, such as the flavor of burnt, the taste of capacitor electrolyte, etc., for an experienced electronic maintenance personnel, it is very sensitive to these odors;

　　"Touch" is to test whether the temperature of the device is normal, such as too hot or too cold.

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