空调器控制器电路故障检修思路（Troubleshooting method for controller circuit of air conditioner）.doc

空调器控制器电路故障检修思路（Troubleshooting method for controller circuit of air conditioner） First power, after load, first strong current, weak current, First indoors, then outdoors, first at both ends, then in the center, If the circuit can be separated from the outdoor circuit, the main circuit and the control circuit, it will make the circuit troubleshooting simple and concrete. How to judge indoor and outdoor circuit fault: 1, the air conditioner has input and output signal line, can be used to judge the short circuit method. Such as the method of air conditioner can return to normal, the fault in the outdoor machine; if not eliminate the fault, the fault in the indoor machine. 2, the outdoor terminal wiring measurement has no AC voltage or DC voltage to determine the fault position. If the AC or DC voltage measurement outside the terminal, the fault in the outdoor machine; such as measurement of AC or DC voltage and the fault in the indoor circuit. 3, the larger power of the cabinet air conditioner can observe the outdoor contactor whether to pull in to determine the fault location, such as contactor pull in, indicating that the fault in the outdoor machine; if there is no pull, that the fault in the indoor machine 4. For faulty display air conditioners, fault location can be identified by observing indoor and outdoor failure codes 5, for the use of serial communication circuit of the air conditioner, oscilloscope can be used to measure the waveform of the signal line to determine the location of the fault 6, for the heat pump type air conditioner is not defrost or defrost frequently, mostly for outdoor main control circuit board fault 7, conditions can also be replaced by changing the circuit board to distinguish the outdoor machine fault How to judge the fault of control and main circuit: 1, for the compressor frequent switch fault, judge fault location by measuring the air conditioning load current and voltage. Such as compressor compressor current is too large, the fa