2 ) door open computer control circuit is shown below. S3 is disconnected, so that the door state detection CPU 's ( 37 ) feet high , CPU to judge the door is open, so stop the cooking process or ban started.AHPservice manual download site

3 ) the door closed when the door is closed , S3 is turned on, the door XP5 state detection by the CPU ( 37 ) feet pulled up to ov, CPU to judge the door is closed, began to detect the "start" command. If not detected " start" command , then the main relay control output ( 39 ) feet, microwave heating control output ( 40 ) feet are the output low . VT5, VT3 deadline to make K2, Kl loss of power release , cut EL, M2, Ml and 220V power supply circuit , this time, the oven light off , no running, no heat .AHPservice manual download site

4 ) door closed press " start" press " start" button , CPU (39) when the key to close the door , ( 40 ) feet are high output , VT5, VT3 saturated conduction , K2 and Kl energized pull, it contacts the microwave heating system , the furnace fan motor and turntable lamp circuit is turned on , this time , the furnace lights , fans and turntable running, start the microwave heating system .AHPservice manual download site

5 ) Non- largest fire set fire regulation , CPU (40) feet of intermittent output high voltage, so VT3 intermittent conduction , Kl intermittent pull or release , 220V power intermittently added to the high-voltage transformer primary winding , intermittent microwave systems heating , the average output power is small, small heating firepower.AHPservice manual download site

6 ) working conditions and the display circuit CPU (3) feet for +5 V power input , ( 2 ) the reset voltage input pin , CPU (5), (6) feet for the clock oscillation pin , external crystal B ( oscillation frequency 4MHz). When the above operating conditions are normal . CPU boot into standby mode. From ( 9 ) - ( 15 ) feet, ( 25 ) - ( 30 ) pin output display control signal ; buzzer control signal from the CPU (38) feet out . CPU by detecting ( 37 ) pin voltage level to determine the status of the door , by detecting ( 25 ) - ( 30 ) feet, ( 33 ) - pin voltage level combination , to determine whether the user is what command input and command , then the above two test results after treatment according to the procedure determined ( 39 ) , ( 40 ) pin output voltage level, current work status control microwave .

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