Maintenance Analysis:

1 . If the machine does not work , look at the power supply is normal, then open the case to see if there burned areas.

  Then measuring whether the 16V transformer output voltage AC voltage ; IC205 absence 12V DC output voltage ; IC204 whether the 5V DC output voltage .

2 . Such as insurance blown varistor burned directly replaced, but also measure other elements around , and then determine the correct startup operation.

Second, the display circuit

The receiving circuit portion of the infrared signal is the internal manifold via AGC circuit amplification, limiting 38kHz 38kHz low- pass filter to filter the modulated signal , demodulates the encoded command pulse , after shaping the amplified output signal corresponding to the microcontroller remote control signal input terminal of the last MCU sends appropriate commands and displayed on the screen ( Figure 1 ) .

Remote input signal is received by the receiver window , input to the chip { 36 } feet, the chip has gone through a variety of signal analysis and processing, the machine to perform a variety of appropriate instruction , and also on the panel shows the corresponding light-emitting diodes machine working condition.

Maintenance Analysis:

1 . Determining whether the first remote control transmitter is normal, the same type of method is used to validate the remote boot .

2 . Air conditioner itself " forced or automatic " switch boot, if not start failure in the main circuit board .

3 . Press the remote control transmitter , use a multimeter to measure DC voltage blocking receiver output pin voltage should be changed, otherwise the instructions on the remote control or receiver has failed.

Third, the input control circuit

    The part of the temperature control circuit includes ambient and pipe temperature control in two parts.

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