Electronic ballast precautions

The electronic ballast is directly rectified by the mains, and then the half-bridge inverter is used to illuminate the fluorescent tube. It is not isolated from the mains, like the hot bottom plate of the TV set. The high-frequency electronic ballast circuit board is charged everywhere. The human body is exposed to the public line (ground line) and there is danger of electric shock. Pay special attention to personal safety during maintenance. After powering up, do not touch any metal parts on the board with your hands, especially if you are holding the board with both hands. Remove the lamp during maintenance, take out two boards A and B from the plastic cover of the two ends of the lamp holder, weld the four wires 1-4 of the filament spring piece, and solder them to the filament pins at both ends of the lamp. In the mains terminal, the switch SWi and the power plug are connected. It is very necessary to connect 5w1. During maintenance, it was found that the SW1 was not connected, and the electronic ballast was damaged several times during the plug-in power-on process. This is because the plug-in process often has multiple turns and breaks, which will result in high The sharp pulse voltage penetrates the consumable component.

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