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Mitsubishi air conditioning repair case sharing

Mitsubishi air conditioning repair case sharing Mitsubishi air conditioner maintenance case sharing Failure phenomenon: Mitsubishi MSH-J12NV split type air conditioner does not rotate the indoor fan after starting, and the rest work normally. Analysis and maintenance: According to the phenomenon analysis, the problem may be in the fan control circuit and related parts. First connect the fan motor separately to the 220V AC power supply and the starting capacitor. The motor runs normally, and it is judged that the fault is on the control circuit board. Analyze the machine control circuit microprocessor integrated block S201DH1. The main circuit of the fan is controlled by the 11th and 13th pins of the IC. Its internal function is equivalent to a thermal relay. When there is a fault, it is equivalent to the short circuit of the two pins at startup. The fan That is, it is connected to the city power, so the internal damage of the IC is judged. After replacing the integrated block S201DH1, the fault is eliminated. Failure phenomenon: A Mitsubishi MSH-12NV type air conditioner remote control on/off is normal, after power off, automatically turn on. Analysis and maintenance: After starting observation, the machine will automatically start after power off, inferring that there is a problem on the control circuit. And the remote control function is normal, indicating that the problem lies in the emergency switch. After inspection, it was caused by improper installation by the installer, and the cover plate pressed the emergency switch. After re-arranging the cover, the machine works normally Trouble phenomenon: A Mitsubishi MUH-17DC air conditioner outdoor unit stops when turning. Analysis and maintenance: According to the analysis of the phenomenon, the problem may occur in the outdoor unit power supply and control circuit. First disassemble the outdoor unit to check, the voltage across the X61 coil of the relay controlling the compressor is 7V, the voltage stabilizing block 7812, the relays X61, X63 are normal, and the driver integrated block M54566P heats up, and the chip is judged to be defective. After replacing the drive block M54566P, the fault is eliminated. Failure phenomenon: When a Mitsubishi RF75WB cabinet type air conditioner remote control is turned off, the outdoor compressor and fan will not stop. Analysis and maintenance: According to the phenomenon analysis, the problem may be in the control signal receiving circuit of the outdoor unit. When you press the remote control to shut down, the indoor unit can shut down normally, and the outdoor compressor and fan continue to run. Soon, the compressor's operating current increases and the power is automatically cut off. It is suspected that the shutdown signal is not received by the outdoor circuit board CPU, and the signal transmission is interrupted or short-circuited. Turn on the outdoor unit to check the circuit and find that the photocouplers PC601 and PC602 (PC817) are damaged. After replacing the photocoupler, the fault is eliminated. Failure phenomenon: a Mitsubishi RF75WB cabinet air conditioner is good or bad when cooling, and shut down when a failure occurs. The indicator light flashes. The fault code is displayed as "E57". Analysis and maintenance: first use a clamp meter to check that the current is 13A, the cooling is normal, and the indoor temperature reaches the set temperature and then shut down. After more than ten minutes, the outdoor unit fan starts to run, but the compressor does not start running, and the indoor unit blows warm air. After about 5 minutes, the air conditioning protection stops. Since the compressor is not running and no cold wind is blown out indoors, the thermistor resistance on the indoor unit heat exchanger does not change much. After this signal is transmitted to the microcomputer, it is judged that the relays of the air conditioner are powered off to protect, causing the air conditioner self-diagnosis to display the fault code "E57". Open the outdoor unit casing and repeat the above operation after turning on the machine. It is found that the AC contactor controlling the compressor has been attracted, but the contact is no voltage after measuring with a multimeter. Use a screwdriver to gently push the test point on the contactor and the compressor runs immediately. , Cooling is normal. Analyze the reason, because the user's power supply voltage is sometimes too low and unstable, or the power cord is too long, which results in poor suction of the AC contactor. Adjust the power line, and troubleshoot after replacing the AC contactor Failure phenomenon: A Mitsubishi SRK32HENF type air conditioner remote control fails, but the panel button control is normal. Analysis and maintenance: According to the phenomenon analysis, the problem may be in the remote control transmitter and remote control receiving circuit. First point the remote control at another normal air conditioner for remote control operation, all functions are normal, and it is judged that the remote control receiving circuit is abnormal. The infrared receiver of this machine adopts CX20106. Open the cover and use a multimeter to electrically block the resistance of each pin to the ground and detect the resistance of the pin to ground. It is found that the resistance value of the sixth foot is obviously too large. After replacing CX20106, the fault is eliminated. Trouble phenomenon: After a Mitsubishi 388 air conditioner is turned on, the indoor fan does not rotate, and the power is automatically cut off after 30s. The yellow light is always on and the green light is on. Analysis and maintenance: According to the phenomenon analysis, the fault generally occurs in the control circuit. Open the cover, first use a multimeter to measure the pins 35 and 31 of IC1, and the collector voltages of Q1 and Q3. When normal, the voltage of IC1 pin 35 is +0.6V, the voltage of pin 31 is +0.3V, the collector voltage of Q1 is +0.7V, and the collector voltage of Q3 is +3.9V. According to the actual measurement, the collector voltage of Q3 is close to 0V, and it is judged that R23 has an open circuit or Q3 has a short circuit phenomenon. After checking, the resistance of R23 is infinite. Troubleshooting after replacing R23. Fault phenomenon: Mitsubishi 285H cold and warm air conditioner does not start after starting, the remote control does not respond. Analysis and maintenance: According to the phenomenon analysis, the fault generally occurs in the power supply. After asking the user to know, not long ago the city power suddenly increased, and then it could not be turned on. It is judged that the power transformer of the indoor unit control circuit is burnt out. Turn on the indoor unit and use a multimeter to measure the resistance of the primary winding of the transformer is very large, no longer (normally should be 600Ω), the fuse has also been fused; the secondary resistance of 2Ω is normal, indicating that the power transformer is damaged. After replacing the power transformer, the fault is eliminated.

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