How To Remove Emergency Light Cover

Mar. 01, 2022

Fire emergency lighting is suitable for fire emergency lighting, is the near common lighting tool in burn emergency, emergency fourth dimension is long, loftier effulgence has automated emergency role.The fire emergency lamp has the characteristics of depression ability consumption, high brightness, long service life and then on. The edge is designed with power switch and indicator lite, suitable for factories, hotels, schools, units and other public places for emergency lighting in example of ability failure.The quality of fire emergency lamp is related to life safe, and its part and lighting time are important indicators in disquisitional moments.

This time we will detach a fire emergency lighting:

1.Disassembly preparation:

（1）Set up materials and tools

（2）Fire emergency lite 1 pcs

（3）Screwdriver ane pcs

（iv）Other tools, etc

ii.Principal panel inspection:

At that place are three indicators on the front panel: fault indicator, charging indicator and master power indicator, also equally an experimental touch on switch push button, the role of the push button is to simulate the ability failure when pressed in the case of master power, cheque whether the emergency lamp lighting function is normal. When the power is connected, the fault calorie-free is commonly off, only now the three indicators are on, which indicates that the internal excursion is faulty and cannot be used ordinarily, and further maintenance is required.

3.Detach internal circuits:

The next pace is to disassemble the internal circuit, remove the screws at the bottom kickoff, remove a total of four screws upwardly and downwardly to open the trounce. There are blackened marks on the interior summit of the shell, and it remains to exist further checked whether any components are burned.

The blackened position is simply above the transformer, but the transformer function is normal and no damage is detected. The source of the blackened textile is unknown, which is very interesting to think almost. Unplug the connector of the indicator cardinal module and see all the internal construction:

4. Detection components:

The main circuit board, because of the single-side printing process, the peak layer is all disassembled components, and the lesser layer has some patch components, amid which the delay switch chip adopts CD4541BE:

Underlying printed circuits and patch components:

v.Detach the low-cal:

After dismantling the internal structure to see the next 2 floodlights, lampshade screw in the lower part, the connection has the trace of rust, screw off the screw can open lampshade.

The lamp ready is composed of several parts: the stock-still band of the glass cover, is metal material, drinking glass lampshade, due to the effect of the above grain, the handful consequence of the lampshade is proficient, reflective embrace and wick, 7 LED lamp set equanimous of beads, the circuit lath of the LED lamp set back, fixed by two screws to the reflective comprehend:

6.Disassembly principle analysis:

The core chemical element of this fire emergency light delay ability off switch is THE CD4541BE, which is a CMOS programmable oscillating frequency divider with adjustable timing and 14-pin packet. Past changing the combination of programming control level connected to pin 12 and 13, the subsequent delay series of built-in oscillation and counter can be adjusted in dissimilar grades, and the desired output timing range tin be selected. It tin can be functionally controlled by changing the level of pivot 5, 6, 9 and ten.

The post-obit is the application circuit of the bit. At to the lowest degree 3 peripheral components are needed to realize the design of the delay switching circuit. The respective parameters tin be set by designing the high and depression levels of the pins:

Source: https://www.godsontechnology.com/news/how-to-remove-an-emergency-light-cover.html

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