How to repair the ballast
An old-fashioned ballast is a coil of iron, such as a burnt out and no maintenance. If the buzzer is the iron core is not tight, can boil the asphalt solution. Current electronic ballast is commonly known as the electronic head. The bad ones are triode and capacitor. The electronic vibrator is now about 5 yuan cheaper, and there's no need to fix it. The lamp tube is black first, sometimes the lamp tube is broken.
If it is two, a diode is burned in the rectifier bridge; If it is less than 2Md2, then C1 and C2 are missing. If the resistances meet a requirement, a dc voltage of about 300V should be applied between the two points. But sometimes a plus charge will burn the RO, which is a short-circuit diode in the rectifier bridge, which should be measured by the positive and backward resistance of d1-d4. Rectifier diode damage probability is small and the filter capacitor is damaged more, especially as the appended drawings, C1 and C2 in series, will cause a chain reaction, a capacitor breakdown, another is damaged. When replacing, it is best to choose the capacitance of 300V. After determining the rectifying circuit, the circuit should be examined again. The value should be greater than 500kSZ because of the disconnection of a and the resistance between b and b with the multimeter RX10k, the resistance between b and b (the red marker and the black marker) is greater than the 500kSZ. If it is 00, should check R10, the c-e of VT2 is burnt out. If the 470 kn,
The main fault of the fluorescent lamp is that the lamp is not bright, and there is no reaction to turning on the lamp. First, measure whether R0 is burned. The RO itself is an insurance, and once the flow is over, it will burn out, so as not to damage more components. Some of the ballast are connected at the RO to the 0.5a safety tube. If the RO burns, there will be a flow failure. To replace the R05 inch at a (see attached), the resistance should be 2Mf (R1 + R2) at both ends of the city's electric lead with a pointer type meter Rx10k. The same is true for the test of a set pen
