Fully automatic washing machine circuit household appliance circuit

Electrical schematic diagram of the electronic program controller of the Jinyu brand XQB30-11 fully automatic washing machine . Its microprocessing system uses
the 28701HZF chip produced by the American Zilog Company.
    The peripheral circuits of the 28 chip include the power supply part, oscillator, function control display part, water level control part, safety switch part, drive part
and buzzer alarm, etc.
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    (1) The AC 220V voltage in the power supply part is transformed by transformer T and then divided into two circuits. One of them is rectified by VD1~VD4, filtered by CI, and
stabilized to FF by the 7806 three-terminal voltage regulator, and then passes through the circuit composed of VT1 and VT2 to the ①, ④, ⑩, ⑩, @, @, @ pins of the 28 pieces
Provide different voltages and also provide high levels to the display circuit. The other path is rectified by VD6, filtered by G and provided to the buzzer HA_A positive potential.
    (2) The oscillator Cio, Cll and quartz crystal G form an oscillator, which is input to the 28 chip through the ② and ③ pins of the 28 chip to provide a
pulse frequency for the chip.
    (3) The selection control system consists of selection switches Sl--S4 and indicator lights LEiDl-LED7. Sl is the water flow selector switch, and the signal is sent to
the @ pin of the 28 chip; S2 is the period selection switch, and the signal is sent to the @ pin of the 28 chip; S3 is the program selector switch, and the signal is sent to the 10 pin of the 28 chip;
S4 bit is start/pause Built, the display circuit is connected to the @~@ pins.
    (4) The drive circuit consists of 28 pieces of pin 0~@ output, which drive the circuit composed of VT6~VT9 and VT3 respectively, so that the bidirectional thyristors
VSI-VS4 are fused and turned on, respectively controlling the water inlet valve, drain valve and the positive and negative direction of the motor. Run in reverse.
    S6 is a water level switch, which can control the water level in four levels: high, medium, low and small amount, and RJ. ,R. . , C,, etc. form a control circuit and input
the ◎ pin of the z8 chip of the CPU. s5 is a safety switch, together with Ria and Rz. , C12 form a control circuit and input the ⑧ pin of the 28th chip of the CPU circuit.
    The buzzer alarm signal is output by the @ pin of the 28 piece, and passes through the circuit composed of VT4, VT5 and VT3 to cause the buzzer to alarm.
    The automatic control dehydration function means that during dehydration,. If the clothes are placed unevenly and cause imbalance, you can stop the machine, add water again, store water for rinsing
, and then dehydrate after the clothes are placed evenly. If the balance still cannot be achieved after rinsing with additional water for three times, the three indicator lights of "Program Selection" will all
go out, the buzzer will alarm, and the operation will automatically stop. After manually changing the unbalanced state, the machine will continue to dehydrate and
    drain automatically. The function means that when there is no drainage such as blockage, the drainage can be interrupted and the buzzer will sound an alarm.
    Function self-calibration means that the washing machine can check its various functions without adding water.