Same specification new light tube

It is worth pointing out that the service life of the lamp tube is not only related to its own quality, but also to the use method and fluctuation of the market voltage. Therefore, the use of mosquito-killing lamps should minimize the switching power supply, preferably only once a day, and at the same time, it is better not to use in the indoor with too high or too low voltage of the municipal electricity, so as to avoid premature aging of the lamp tube and prolong its service life.

Ultraviolet fluorescent tube bright, but no voltage in high voltage grid

The method of judging whether there is voltage on high voltage power grid has been mentioned before. There are two main reasons for this kind of fault: first, the lead of voltage doubling rectifier circuit or the lead of printed circuit board have the phenomenon of circuit breaking. Usually, it can be measured by visual or multimeter, and the fault point can be found quickly. Careful re-welding can solve the problem. The second is the damage of diodes, resistors or capacitors in the voltage doubling rectifier circuit. During maintenance, R1, VD1, VD2, VD3 and C2, C3 and C4 in Figure 2 can be checked one by one on the road. Owing to the small number of components, it is usually very quick to find the fault. If the diode is damaged, it can be replaced by 1N4007 or 1N4006. If the capacitor is damaged, it is better to replace it with a polar capacitor with the same capacity and withstanding voltage greater than or equal to 400V. Because some manufacturers of mosquito-killing lamp use lower voltage specifications of capacitors to reduce costs, so that the failure rate is higher, the replacement of high-quality capacitors during maintenance can avoid or reduce the occurrence of such failures. In addition, the high voltage will disappear when there is a short-circuit fault in the high-voltage power grid, so it is necessary to check whether there is a short-circuit fault in the high-voltage power grid during maintenance, and if so, it should be eliminated.

Ultraviolet fluorescent tubes often flicker (flicker)

This kind of fault is usually caused by the low voltage of the city electricity, but also by the aging of the lamp tube. If the measured voltage is normal, the lamp can be changed. It is also possible to increase the C1 capacity to 0.2-0.47 uF, but this is only a temporary measure, and to replace the original capacity when replacing the lamp.

Low voltage of high voltage power grid and poor mosquito control effect are generally caused by the obvious reduction of capacitor capacity in voltage doubling rectifier circuit, which can be checked one by one and replaced with bad capacitor. In addition, it should be explained that the efficacy of mosquito control lamps is closely related to the correct use of methods, so we must pay attention to the use of methods, specific can refer to the random instructions, no longer introduced.

High-voltage power grid fire jump and make noise, which is the phenomenon of leakage fault in high-voltage power grid. We can carefully observe whether there are large insects, dirt and other foreign bodies in the discharge place. After detection, turn off the mosquito lamp power supply, and then thoroughly remove these foreign bodies, the fault will disappear.