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(1) Adjustable resistance, because the adjustable resistance of the centrifuge is installed on the control panel, the frequency of use is very high, the time is long, and the situation of poor contact is very common. "
(2) There are also many problems with thyristors, usually breakdown short circuit, open circuit, unable to trigger or poor internal contact, etc.
(3) One of the four rectifier diodes is only a problem
(4) There is carbon powder or carbon brush between the motor rotor and the commutator that is not good, etc., in accordance with the principle of easy to repair, first measure the adjustable resistance, the resistance value changes regularly with the adjustment, proving that the potentiometer is Ok, no problem was found when measuring the SCR. "When measuring four rectifier diodes, one was found to be good or bad. Because the diode is a high-current gold-sealed tube, one end of the screw is fastened to the circuit board, and the other One end was soldered to the circuit board with a wire. When it was removed from the circuit board, the positive and negative electrodes were found to be loose. Then they were shaken while measuring to confirm that the diode was good or bad. Because the tube model could not be seen clearly, the same The tube of the specification is installed, the power is turned on and the speed is very fast. It is believed that the just broken tube breaks down and the measurement is intact. The measurement of the other three diodes is normal. However, when comparing the measurements, it was found that the positive and negative polarities of the two types of diodes On the contrary, one end of the upper screw has positive polarity and negative polarity, so it is best to use the same model when installing.
Personal Cleaning Tools,Hairdressing Tweezers,Foot Rubbing Board,Eyebrow Tweezers
Yangjiang Etina Houseware Co., Ltd. , https://www.etinanailtools.com