How to Test and Replace a Faulty Micro Switch

A micro switch is a small electrical switch that can be triggered by a very small force or displacement. Micro switches are widely used in various devices and machines, such as elevators, vending machines, microwaves, etc. Sometimes, a micro switch may malfunction or wear out and need to be replaced. Here are some steps to test and replace a faulty micro switch.

Step 1: Identify the micro switch

The first step is to locate the micro switch in your device or machine. You may need to open the cover or panel of the device or machine to access the micro switch. Usually, a micro switch is a small rectangular box with two or three terminals and a lever or button. You can also refer to the manual or schematic of your device or machine to find the micro switch.

Step 2: Test the micro switch

The second step is to test the micro switch to see if it is working properly. You will need a multimeter, a pair of wires, and a battery for this step. First, set the multimeter to continuity mode and connect one wire to each terminal of the micro switch. Then, connect the other ends of the wires to the battery terminals. Next, press or move the lever or button of the micro switch and observe the multimeter reading. If the multimeter shows zero or near zero resistance when the lever or button is pressed or moved, and infinite resistance when it is released, then the micro switch is working properly. If the multimeter shows no change in resistance or erratic readings, then the micro switch is faulty and needs to be replaced.

Step 3: Replace the micro switch

The third step is to replace the faulty micro switch with a new one. You will need a screwdriver, a soldering iron, and a new micro switch for this step. First, disconnect the power supply of your device or machine and remove the wires from the terminals of the faulty micro switch. You may need to unscrew or desolder them depending on how they are attached. Then, remove the faulty micro switch from its mount or bracket and discard it. Next, insert the new micro switch into its mount or bracket and secure it with screws or clips if needed. Finally, connect the wires to the terminals of the new micro switch and solder them if needed. You can also use heat shrink tubing or electrical tape to insulate the connections.

Step 4: Test the new micro switch

The fourth step is to test the new micro switch to see if it works as expected. You can repeat step 2 with the new micro switch and check if it shows normal readings on the multimeter. You can also reassemble your device or machine and turn on the power supply and see if it functions normally.