In the process of mixer maintenance, we often encounter many difficult faults, especially the circuit fault of the mixer. Sometimes we can't get started. We don't know where the trouble is, let alone remove it quickly. Here are some troubleshooting methods for mixer circuit.
Intuitive diagnostic methods
When the circuit of a special vehicle breaks down, some abnormal phenomena such as smoke, sparks, abnormal noise, scorching and heating may occur. These phenomena can be directly observed to determine the fault location.
Open circuit method
In case of grounding fault of mixer circuit equipment, open circuit method can be used for judgment. After disconnecting the circuit section suspected of having a ground fault, observe whether there is still a ground fault in the electrical equipment to determine the location and cause of the circuit ground fault.
Short circuit method
If there is an open circuit fault in the mixer circuit, the short circuit method can also be used to judge, that is, use the driver or wire to short circuit the circuit suspected of having an open circuit fault, observe the change of the instrument pointer or the working condition of the electrical equipment, and judge whether there is an open circuit fault in the circuit.
Test lamp method
The test lamp method uses the vehicle bulb as a test lamp to check whether there is an open circuit fault in the circuit.
Observe the indications of ammeter, water temperature gauge, fuel gauge and oil pressure gauge on the instrument panel of the mixer to judge whether the circuit is faulty. For example, when the engine is cold and the ignition switch is on, the full scale position of the water temperature gauge does not move, indicating that the water temperature gauge sensor is faulty or the circuit is grounded.
Low voltage grounding fire test method: remove the end of a wire of electrical equipment and test whether the metal part of the truck produces sparks. This method is relatively simple and is often used by mixer electricians. There are two methods of grounding test: direct grounding test and indirect grounding test. In particular, the fire resistance test method cannot be used on electronic circuit vehicles.
Direct grounding mode: no-load direct grounding produces strong sparks. For example, if you want to judge whether there is a fault in the circuit between the ignition coil and the battery, you can remove the wire end connecting the ignition switch on the ignition coil and scratch the body or frame. If there is a strong spark, the circuit is normal; If there is no spark, the circuit is open.
Indirect grounding method: a weak spark is generated by the concrete mixer electrical appliance to ground a load to judge whether there is a fault in the circuit or load. For example, the connecting line of the circuit breaker of the traditional ignition system is grounded. If there is spark, the circuit is normal; If there is no spark, the circuit is open.
High pressure ignition test method
Ground the high-voltage circuit of the ignition test, observe the electric spark and judge the working state of the ignition system. The specific method is: remove the high-voltage wire of the ignition coil or spark plug, align it with the spark plug or cylinder head at a distance of about 5mm, then turn on the start switch, turn the engine, and see the ignition jump. If the spark is very strong, the sky is blue, and the sound of fire jumping is very loud, it indicates that the ignition system works normally; Otherwise, the ignition system is not working properly.
The above is the content to be explained today. I believe that after reading the description of this article, you can have a certain understanding of the product. I hope the above content can help you. In addition, if you want to learn more about our website, you can pay more attention to our website at www.zkhntjbj com。