Air conditioning fan circuit? How to repair the circuit board fault of air conditioning fan?

There are many cool products on the market now, such as air conditioners, fans and air-conditioning fans. Air conditioning fan is a combination of air conditioning and electric fan, with complete functions. But many people still can't understand the circuit diagram of the air-conditioning fan, and don't know how to repair the circuit board fault of the air-conditioning fan. If you have this problem, follow me to find out. There are many cool products on the market now, such as air conditioners, fans and air-conditioning fans. Air conditioning fan is a combination of air conditioning and electric fan, with complete functions and simple operation. But many people still can't understand the circuit diagram of the air-conditioning fan, and don't know how to repair the circuit board fault of the air-conditioning fan. If you have this problem, follow me to find out.

Circuit diagram of air conditioning fan?

The control circuit of air conditioning fan is basically the same as that of ordinary electric fan. Fig. 2-23a shows the control circuit of an ordinary air-conditioning fan, in which PT is a timer, SA 1~SA5 is a wind direction switch, a cold air switch, an electric heater switch, a speed regulating switch and a high temperature switch, LED 1 is a power supply and air supply indicator, and LEDs 2-4 are air guide, cooling and heating indicators. M3 is a fan motor, which adopts tap mode for speed regulation and is divided into three wind speeds: high, medium and low. M 1 is the wind deflector driving motor, and M2 is the water pump motor. In order to prevent overheating during heating, a thermostat ST is connected in series with PTC 1 and PTC2 of the electric heater, and C is the starting capacitor of the fan motor.

How to repair the circuit board fault of air conditioning fan?

1. When the power supply is plugged in, the circuit board of the air conditioning fan does not respond. Without a clear circuit structure, all components on the circuit board may be damaged, including integrated circuit blocks.

2. The circuit board of the air conditioning fan controls the fan motor, which needs power supply for normal operation. Due to the limitation of volume, resistance and capacitor power supply are mostly used, and the circuit board does not respond. Check the power supply first.

3. The control elements of the circuit board are generally silicon controlled rectifier, which is also the easily damaged part. If the SCR is burnt out, the circuit board will also be slow to respond, and it also needs to be inspected.

It should be said that the possibility of integrated circuit damage is relatively low. If there is nothing wrong with the peripheral electronic components, then the integrated circuit block (or the control board) should be replaced.

5. In addition, the circuit board controls the fan motor, which does not rule out the possibility of disconnection of the fan motor. If the fan motor is disconnected, the circuit board will not respond when the power supply is plugged in.

Through the introduction of the above article, you should have a clear understanding of the circuit diagram of the air conditioning fan and how to repair the circuit board fault of the air conditioning fan. When the air conditioning fan circuit fails, we must find out the specific reasons, so as to fundamentally solve the problem. When using air-conditioning fans in daily life, you must do a good job of maintenance to avoid air-conditioning failure.