When an inductor is damaged, it should in principle be replaced with an inductor of the same type, main parameters and size. However, if the same type of inductor cannot be found, other types of inductors can be used as substitutes.
When replacing an inductor, the first consideration should be whether its performance parameters (such as inductance, rated current, quality factor, etc.) and dimensions meet the requirements. Several commonly used inductor replacement methods are as follows:
1. Small fixed inductors and color-coded inductors can be directly substituted for each other as long as the inductance, rated quality and size are similar.
2. In semiconductor radios, although the oscillator diagrams are different, they can be substituted for each other as long as their inductance, quality factor and frequency range are the same. For example, oscillator diagram 1F-1-1 can be directly substituted for 1TF-3.
3. The horizontal oscillator coil in a television set should be selected from products of the same model and specifications as much as possible; otherwise, it will affect the working state of the circuit.
4. Deflection coils are generally used in conjunction with picture tubes and horizontal and vertical scanning circuits. However, as long as their specifications and performance parameters are similar, they can be substituted for each other even if the models are different.
Open circuit is a common fault in inductors, especially in inductor coils wound with fine multi-strand enameled wire. In addition to desoldering, the cause of this fault is likely due to mold and breakage after the coil gets damp. The broken wire of the coil is often caused by moisture, mold or breakage. Most of the faults occur at the solder joints of the inductor coil or at locations where breakage is common.
Short circuit fault: This fault occurs because the insulation between the coils deteriorates after the inductor coil is turned off, resulting in leakage or partial short circuit. During testing, the resistance value will be found to be smaller than normal. The more severe the short circuit, the smaller the resistance value. Leakage or partial short circuit in the inductor coil will cause the inductance and quality factor of the inductor to be unacceptable. If the coil is completely short-circuited (resistance value is 0), it is often because the two leads of the coil touch.
Broken strand fault: This is particularly common in medium-wave inductors in radios, because most medium-wave inductors are made of thin, multi-strand enameled wire, with 7, 9, 14, or 28 strands. The more strands, the higher the q value of the coil. However, it is easy for some strands to break in multi-strand wires, especially at the wire bonding and lead-out solder joints. When measuring this fault, you will find that the resistance value of the inductor is higher than before. If the broken strand occurs at the joint, it can often be found through careful observation.
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