{ 57 } foot buzzer for remote control input set , when the chip receives a valid signal , the buzzer will beep loudly.

Maintenance Analysis:

1 . Since the output current in the circuit is large, and there relay actuators, many opportunities arise problems such as burn module , the relay coil is off, and some contact bonding failure judgment more easily .

2 . When the module is available in the following Manifold 2003 damage instead : MC1413P, KA2667, KA2657, KID65004, MC1416, TD62003, M5466P so on.

Fifth, the microcomputer chip circuit

The circuit chip model used is NEC75028GC-657-AB8 (V4.0 Version ) 4 rows of 64 pins , the chip has been written to the air conditioning operation procedures, the input signal for computing and comparing , based on the calculation and comparison results to determine the compressor, fan , four-way valve and other control methods .

1 . The main function of each pin :

Positive power supply VDD (+5 V) then { 55 } { 56 } { 57 } feet ;

    VSS power supply connected to the negative terminal { 46 } {24 } , {9 } feet.

    { 1} foot signal after IC202 (ULH2003A) driver module electrically heated amplification control relays working condition.

{2 } ~ {6 } feet after IC202 driver module control zoom later work wind motor, fan motor.

    { 18 } ~ {20 } feet as an emergency operation , commissioning , dust filters clear switch in the future .

    { 21 } ~ { 23} feet as C and D plate template selector switch .

    { 25} feet used as a heating and cooling plate , cold plate single selector switch .

    { 26} feet for three minutes delay after compressor shutdown protection .

    {31 } ~ { 34 } feet as the indoor fan speed adjustment , do not use in normal circumstances , but when you have special requirements, it is used as a speed compensation.

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