How to use a multimeter to find problems
The multimeter checks electrical faults, generally only two gears are used, one is voltage (including AC and DC voltage) and the other is ohms.
If the equipment is not working, the first thing you think about is whether the voltage of the equipment is normal, you need to use the voltage range of the multimeter (choose AC voltage range or DC voltage range, it depends on whether your equipment is AC equipment or DC equipment) to measure. If the control circuit or the secondary circuit is disconnected, if you are familiar with the schematic diagram, you have to use the voltage file to measure whether the voltage at a certain place is normal. If you are sure that the voltage at this place should not be there, there is instead, and what should be there is not. , it means that there is a disconnection or poor contact. In order to be more sure whether there is a problem here, you have to disconnect the power supply of the device at this time, and use the ohm file of the multimeter to determine whether there is indeed a disconnection here, so as to troubleshoot. Roughly, it mainly depends on your familiarity with the equipment and the accumulation of experience at work.
