The power supply circuit is provided for the whole different supply voltages.

Remote control receiver circuit shown includes a circuit for reflecting the state and function of the air conditioner .

The control circuit includes a temperature input , such as pipe temperature and defrost control circuit .

The output control circuit includes a compressor , fan , wind motor, four-way valve , the buzzer drive circuit and signal circuit.

Microcomputer control circuit includes a central processor CPU, program memory ROW, the data memory RAM, input and output I / O ports.

The following detailed analysis of the characteristics of the circuit and repair points.

A power supply circuit

220V 50Hz AC voltage through the transformer into the AC power 16.2V, and powered by two routes here : all the way from the X211, C204, R241 and other components of the detection signal is input to IC201 {38} feet, provide a time reference for the computer chip ; another full-wave rectifier C102 pass filter, three-terminal regulator blocks IC205 (7812) regulator , C221 filtered by +12 V DC voltage supplied to the thermal protection , power module IC203, IC202, fan motor and other circuits. +12 V DC voltage and then the three-terminal regulator blocks IC204 (7805) to give +5 V DC voltage, the reset circuit, a current detection circuit of the compressor , temperature detecting circuit , a circuit panel display , an evaporator defrost control circuit for a three -minute delay circuit provide operating power.

In the power supply circuit, varistors L1 when the supply voltage exceeds 245V, the varistor becomes conductive immediately by the deadline , because it parallel with the power supply , the power fuse is blown so quickly to prevent burn the main circuit board. Varistor is a one component , the burn should be replaced , but only if no change varistor fuse will burn out other components on the circuit board so again when the overvoltage .

 6    1 2 3 4 5 6 Next Last