How To Repair A Dynamic Microphone?

A microphone converts an audio soundwave into an electrical signal. In other Words, it works by transduction, converting one form of energy (sound) into another (electrical). The exact process that the individual microphone uses differs depending on the type of microphone.

A dynamic microphone is much tougher than other types of microphones, such as a condenser. These work by electromagnetic induction rather than by a condenser microphone’s makeshift capacitor. An induction coil, which is a small wrap of electrical wire, is placed inside the magnetic field of a permanent magnet. This assembly is then attached to the diaphragm of the microphone. How a diaphragm works is similar to how a human eardrum: vibrations create mechanical energy that is then translated into electrical energy.

Repairing a dynamic microphone can be a complicated process, since you have to determine what went wrong. A typical scenario arises when the diaphragm is moved out of place from excess vibrations, leading to electrical shortage of the microphone and the wiring burning out. Before taking apart the microphone, check to see whether the microphone is the source of the problem. Switch out the microphone, and if there is still no sound, change the cable. Check to make sure the amplifier is working, and check that the microphone’s switch is set to on.

If the microphone itself is the problem, unplug the cable and get tools like some needle-nose pliers. It’s good to also have a voltage meter to check the continuity of the wiring as you explore the microphone’s innards. Start by carefully disassembling the microphone at the end, where the cable connects to it. A small screw on the outside holds the connector in place. Unscrew the connector and lift it out of the microphone using the needle-nose pliers.

Inspect all solder joints and wire junctions for fraying or burning. If a joint or wire end is loose, re-solder the connection. If there is burning, you need to disassemble the microphone more. The transformer is between the connector and the cartridge, which houses the microphone’s induction mechanism. If it’s visible, check for burning and loose solder joints. If the transformer is burned, you will have to replace it. Re-solder any loose joints. Most microphone problems are due to cartridge failure, so check the cartridge carefully and replace it if you need to.