Skip to main content

How to inspect and repair inductors?

The magnetic rod inductors or magnetic loop inductors in the circuit board are mainly used in various power supply circuits. The magnetic rod/magnetic ring inductor can be measured with a digital multimeter or a pointer multimeter. For accurate measurement, the inductor can be measured with an open circuit.

Use a digital multimeter to detect the inductor in the circuit board:

(1) First, disconnect the power supply of the circuit board, and then observe the magnetic bar inductor to be tested to see if the inductor is damaged, whether it is burnt, soldered, or the coil is deformed. If there is, the inductor has been damaged. The figure below shows a magnetic bar inductor to be tested.

Magnetic rod inductor
(2) If the appearance of the magnetic rod inductor to be tested is not damaged, solder the magnetic toroidal inductor to be tested from the circuit board with an electric soldering iron, and clean the pins at both ends of the magnetic toroidal inductor, and clean the remaining pins on both ends The dirt, to ensure the accuracy of the measurement. The desoldering method of the magnetic bar inductor is shown in the figure below. 

magnetic rod inductor

(3)Turn the digital multimeter to the "200" block of the ohm block.

Multimeter
(4) Put the red and black test leads of the multimeter on the pins at both ends of the magnetic bar inductor to be tested, and check the resistance between the two pins.
magnetic rod inductor

Since the measured resistance of the magnetic bar inductor is very close to 00.0, it can be judged that the inductor has no open circuit fault. Then select the "200M" gear of the multimeter to detect the resistance between the coil lead of the inductor and the iron core, and between the coil and the coil.

Under normal circumstances, the resistance between the coil lead and the iron core, and between the coil lead and the coil lead is infinite, that is, the dial of the digital multimeter should always display "1" during measurement.

Magnetic rod inductor insulation test

It has been tested that the magnetic bar inductor has good insulation and no leakage.







Comments

Popular posts from this blog

How to repair ASIC miner hash board

How to repair ASIC miner hash board Important parts of ASIC miners – Hash board One  ASIC miner consists of 3 to 5 Hash board, a control board, a casing, and software, among which the Hash board are easiest  to broken. because the ASIC bitcoin miner hash board consists of many serially connected ASIC chips. When they work, they will be in a high-temperature environment for a long time. In this environment, it is easy to burn the chip or scatter the solder due to high temperature which makes the hash board or the mining machine unable to work and no hash rate. How to quickly detective which chips broken it’s the most important when we repairing ASIC miners The Antminer chips fixture fast efficient and easy to use Bitmain Antminer repair inspection tool The ASIC bitcoin miner hash board consists of many serially connected ASIC chips. When they work, they will be in a high-temperature environment for a long time. In this environment, it is easy to burn the chip or scatter the solder du

Antminer APW9 and APW9+ Power Supply Repair Guide

Antminer APW9 and APW9+ Power Supply Repair Guide Apw9 Apw9+ is a high-power PSU with 2 single-phase AC inputs and 2   DC outputs. 1: 14.5v-21v voltage adjustable output, maximum current 170A 2: 12v voltage fixed output, maximum current 12A The circuit board layout is mainly divided into: 1A - The first AC input and EMI circuit 1B - PFC and MOS circuit 1C - 12V auxiliary circuit and VCC circuit 2A -  2nd AC input and EMI circuit 2B - PFC and MOS circuit 2C - 12V auxiliary circuit and VCC circuit 2D - 12V output port and PIC communication port   The vulnerable parts of PSU are: fuse, MOS, rectifier bridge A more detailed circuit diagram is provided in the document for  Reference See more details here  Antminer manuals and repair guide

How to repair antminer T17 Hashboard and repair guide manual download

How to repair antminer T17 Hashboard and repair guide manual download This version contains the basic circuit schematic diagram and chip signal direction and voltage introduction We currently publish in Chinese and the English version will be released soon Basic overview: Antminer T17 single hash board uses a total of 30 hash chips, the model is "BM1397", and the signal direction is sequentially transmitted from U1 to U30. Signal direction: "CLK / CO / BO / RST", transferred from U1 to U30, "RI" is transferred from U30 to U1 It also passes 5 test points for testing and maintenance The five test points are: CLK-CO-RI-BO-RST (Please note: The location of the test points in different voltage domains are also different, please refer to the picture notes) For notes and instructions on the test points, please see the following articles: The whole board has 30 chips, divided into 10 voltage domains, and each voltage domain contains 3 chips For the description of