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I have several netapp power supplies that run my old disk shelves. A few of them have gone bad and it appears they all have an axial Inductor that is burned up on each one of them. Unfortunately there aren't any bands left to read so I can't tell what size to replace them with. The inductor goes between a leg on a small transformer (can't find any info on the transformer) and the gate of a mosfet 1A31AL . I'm at a loss as to what to replace them with and my electronics skills aren't wonderful. Soldering no problem. Any clue what I should use? I also couldn't find any pcb diagrams on the power supply anywhere. The power supplies were made by Power One and are about 10 years old roughly. because they slide into disk shelves and have a good number of pins I don't have a clue how I can test voltages. I would assume everything is 12v or 5v DC output as everything connected in the units is as such. Input voltage is 120v
Any help is greatly appreciated. (Even telling me there isn't enough information and what I could provide that might shed light.)

Replacing an unidentified axial inductor can be a challenging task, especially without knowing the exact specifications. However, there are some steps you can take to determine the appropriate replacement:

1. Determine the physical size: Measure the dimensions of the burned-up inductor, including the length and diameter. This will help in identifying potential replacements that have similar physical dimensions.

2. Estimate the inductance value: If you don't have any information about the inductor's value, you can try to estimate it by comparing with similar components or by checking the values of nearby components on the circuit board. Inductance is typically measured in Henries (H), millihenries (mH), or microhenries (µH).

3. Check the current rating: Identify any markings or labels on the power supply or nearby components that indicate the maximum current the inductor should handle. This will give you an idea of the required current rating for the replacement inductor.

4. Research similar power supplies: Look for any documentation or manuals for similar NetApp power supplies or Power One power supplies of the same era. There may be schematics or parts lists available that can provide information about the inductor used.

5. Seek expert advice: Consider reaching out to electronics forums or communities where experienced individuals can help identify the suitable replacement inductor based on the information you have. They might be able to provide suggestions based on their knowledge and experience.

6. Consult a professional: If your electronics skills are not sufficient for identifying and replacing the inductor, it is advisable to consult a professional technician or an electronics repair service. They will have the expertise and knowledge to identify the correct replacement component.

When dealing with electronic components, it's essential to exercise caution and follow proper safety measures, especially when working with high voltages. If you are unsure about any step or feel uncomfortable, it's always best to seek professional assistance.

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