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I was assigned to the after-sales service department of Jilin Jinuoer Electromechanical Company after graduation. My work is mainly the maintenance of refrigerators and freezers, and the installation and maintenance of air conditioners. Case: After the refrigerator (Jinuoer 208) is electrified, the compressor starts to work normally, but it can't refrigerate. When the refrigerator hears the sound of capillary gas, it is judged to be refrigerant. Because 208 is the internal organs of Lu: pipe, it is preliminarily judged that the evaporator leaks water. The compressor cuts off the low-voltage line and pressurizes the evaporator. After the pressure gauge is set to 10, the screw is tightened. After two hours, the pressure drops to level 7. The pressure on the evaporator is the leaking place. The refrigerator Remove the evaporator, open the insulation layer, enter the brass evaporator and evaporator condenser, and at the same time suppress the leakage, which is not disclosed. The insulation layer, the huge pressure well, vacuumizing and fluoridation, normal operation and refrigeration. Air conditioning (Chunlan 1P wall-mounted air conditioning subgroup), the indoor unit is turned on, only the air is blown out, without refrigeration, the indoor temperature is higher than the inspection temperature, the fan is running, but the compressor is not started, the power supply of the chassis is turned on, the compressor and the starting capacitor of the compressor are checked with an external meter, and finally the starting capacitor capacity is measured. It is forbidden to get on the machine after the condenser with the same capacity. The compressor is activated, and the indoor mechanical cooling is normal. Haier 1.5P wall-mounted air conditioner has poor refrigeration. Check the plane switch when starting. There are grease valves. Watch 1, 1 17000. Fluorine is added. The refrigeration is normal. The external screws of the grease valves are tightened, and there are no signs of air bubbles and water leakage. Repair after going home.