How to Change a Fuseĭid you know that fuses are actually designed to break or blow as a protection to your electrical system? It’s true. Just like in your home, knowing how to locate and replace the problem fuse can save you money in repairs. Blown or burned-out fuses are often the reason for electrical glitches and problems in your vehicle. If you want to learn more about diagnosing common electrical problems in your appliances or you’re looking for specific parts, check out Appliance Express for more information.While we agree that most automotive repairs are best left to the professionals at Heath’s Auto Service, there are some basic repairs that you can easily do yourself. Inspect the component for physical damage and rule out the other three components to determine if the magnetron is at fault. Microwave Magnetron: There is no way to accurately bench check a magnetron. If the resistance deviates strongly from these amounts, then the transformer is broken and must be replaced. From there, you will measure the proper resistance for each line when the microwave has no power.
Microwave High Voltage transformer: Transformers are very similar but we recommend you pull the wiring schematic to locate what wire does what. This needs to be checked on both ends of the diode, and it should only rise from one end since diodes only allow electricity from one direction. If the resistance never changes, the diode is shorted and needs replaced. If the resistance stays high, the diode is stuck open and needs to be replaced. Place your meter leads on the ends of the diode and you should see a quick rise and fall on your meter. Your meter needs to be using a 9-volt battery. Microwave Diode: Isolate the capacitor and check for resistance on the most sensitive scale. If the resistance never changes, the capacitor is shorted and needs replaced. If the resistance stays high, the capacitor is stuck open and needs to be replaced. Place your meter leads on the ends of the cap and you should see a quick rise and fall on your meter.
Isolate the capacitor and check for resistance on the most sensitive scale. Microwave Capacitor: Test the capacitor by first discharging it. This verifies that nothing that takes just 120 volts like your door switches and electronic control is causing the issue. In the most common scenario, your microwave will start up and run with no issue. Once the power is back on, test it by microwaving something like a small bowl of water or anything that lets you easily test the heating power. Isolate the high voltage circuit by removing one lead off the power supply leading to the transformer. Even though a microwave can run without the cover, you want to fully reattach it for your safety. Then, you need to repower it: this means putting your microwave back together again so you can plug it in safely. Use a resettable fuse before testing so you don’t run through new fuses while testing primary malfunctions, but you can test with new fuses if that is more convenient. If you do not how to discharge a capacitor safely, STOP RIGHT NOW. Be sure to discharge the capacitor before messing with anything inside the microwave. Microwaves can have 2000 volts of electricity in the high voltage circuit and can easily lead to injury or death. WARNING: Do not attempt unless you have training in appliance repair. If the fuse is blown, that’s usually caused by another malfunction.
What do you do know that you know the inline fuse is blown? A blown fuse really means one of your electrical components has broken or failed, and the next step is to find out which piece that is. A blown fuse is one of the most common problems a microwave can have, but that’s just the indication that something has gone wrong.