Many people like to cook by themselves, but in fact, when we are cooking, there will be a lot of smoke, oil and harmful gases in the kitchen, which are actually harmful to human health if inhaled for a long time. In the past, when people haven't solved the problem of food and clothing, it seems that there is no need for an oil fume purifier. However, in today's era, the existence of an oil fume purifier is very necessary. It can remove oil fume well and maintain air circulation. Then, sometimes there will always be some problems with the lampblack purifier. What should I do? Today, Xiaobian will tell you about the common troubleshooting methods of catering fume purifiers.
1. Turn on the power supply, only one motor rotates, the other motor does not rotate, and it makes a "buzzing" sound.
(1) The motor is faulty or the impeller is stuck.
(2) The parts related to the motor are stuck.
(3) the starting capacitor is damaged.
check the key switches SB: and SB, and the motor m. And the starting capacitor, it is found that the starting capacitor of the motor M: oil fume purifier is broken, which makes the motor M: unable to start. Replace the starting capacitor of motor M: and troubleshoot.
2. Press the automatic alarm and exhaust switch, and the exhaust fan will start immediately, but the alarm will also alarm at the same time.
the main reason for this failure is the failure of delay circuit components. Check r separately; 、A。 , R:, C2 and other related components, found that the capacitor (J open circuit, resulting in abnormal operation of the delay circuit, troubleshooting after replacement.
3. press the auto key, and the green LED will not light up? The power supply circuit of the gas sensor is faulty. After power failure, check transformers, rectifier diodes, integrated circuits, transistors, capacitors and C. , resistance R. . Components, such as filter capacitor c, was found to be broken down, causing the power circuit to work abnormally.
4. In case of harmful gas, the detection fails
The gas sensor tube fails or the sensitivity is reduced, which is caused by the poor working of the regulating circuit. The gas sensor is an N-type semiconductor element, and its resistance decreases when it comes into contact with combustible gas. Different gas concentrations have different resistances, and the higher the gas concentration, the smaller the resistance.
firstly, check the sensitivity adjustment potentiometers R and R. If it is found that potentiometer R is open, the gas sensor tube will not work properly. Replace potentiometer R ",then adjust potentiometer R", and the gas sensor tube will work normally. Troubleshooting.
5. No alarm sound
If the 7-pin output of integrated circuit A is high, the LED H should be checked. Whether it is luminous or not, if H. is not, it is R. Or VT, open circuit; If H. On, the speaker BL is bad or the music integrated circuit is damaged.
6. The alarm sounds incessantly
When there is no gas, if the 7-pin output of integrated circuit gas is low level, but the alarm sounds incessantly, the LED H should be checked. Whether it glows, if H. On, it is VT. Breakdown; If H. If it doesn't light up, the music integrated circuit is damaged.
7. Control failure of exhaust motor
When the oil fume purifier comes into contact with combustible gas, the exhaust motor does not rotate, or when there is no combustible gas, the exhaust motor does not stop running, all of which belong to control failure of exhaust motor. ? (1) In case of combustible gas, all pins of the integrated circuit should be at low potential. If the voltage of 9V is normal, the motor still does not rotate. Generally, the transistor VT: is broken down, resulting in the relay not being released, and the normally closed contact cannot be connected to the motor power supply. At this time, Hz should always shine, and VT: should be replaced.
(2) If the motor does not stop running when there is no gas, it is the coupling resistance R,. Or transistor VT: open circuit, capacitor C.
leakage causes the relay not to close or the relay coil is open.
8. when the motor rotates, the noise is too high? Check as follows:
(1) Whether the motor fan impeller is damaged.
(2) whether the motor impeller is loose.
(3) whether the motor bearing gland screw is loose.
(4) whether the motor bearing is bent and deformed, whether the rotor leans to one side, and whether it sweeps the bore when rotating.
The above are some common troubleshooting methods for cooking fume purifiers, which I hope will be useful to everyone. Sometimes we can actually solve some problems of electrical appliances ourselves. If we can't solve them, we can consult relevant industry experts. In addition, everyone should pay attention to the correct use when trying the lampblack purifier. For example, there must be a filter in the direction of the air inlet, and the details such as the oil outlet must not be blocked. The lampblack purifier just bought should be carefully read to make it better used.