For the failure of medical device boards, some large-scale devices such as CT and nuclear magnetic machines have their own programs that can detect the cause of machine failures. Some of the board faults can be detected by the running test program. The circuit board online tester is a new type of maintenance tool based on computer technology. It can perform functional test and model identification on various digital integrated circuits and ICs on the circuit board, which can help accurately judge damaged components and reduce the overall height of the circuit board. Amount of fees. The digital oscilloscope has the advantages of strong anti-interference and accurate test. It can measure multiple parameters such as frequency, collect and store the waveform and data of the key points of the board. Once the instrument fails, the normal value comparison can be adjusted to repair the instrument as quickly as possible. malfunction.

Board maintenance is divided into overall repair and maintenance of electronic components on the board. The overall repair is to replace it with a good circuit board, so that the equipment can resume normal work, such maintenance is rarely used. For the maintenance of electronic components, each circuit board on medical electronic equipment consists of many components, such as: resistors, capacitors, diodes, various integrated blocks, etc., through the detection of faulty devices on the board, after replacement of the board Can return to normal.

The repair of the faulty circuit board firstly cleans and derusts the surface. If the fuse is burned out, the fuse of the same specification can be replaced frequently to resume normal operation. When the problematic component or chip is identified, the failed component needs to be replaced. Early discrete components can be removed and installed with an electric soldering iron and a soldering tin. Later surface mount components can be removed and installed using a hot air blower.

Steps for repairing electronic components of medical device boards:

1 Understand the situation

Ask the operator about the specific working conditions of the equipment before and after the fault, such as voltage, sound, smell, fault is sudden or gradual, as the first-hand information for maintenance.

2 Analysis failure

Be familiar with the working principle and system composition of the equipment, and make analysis and judgment based on the situation at the time of the fault and the accumulated experience.

3 fault check

3. 1 First look at the amount, the circuit board to be repaired first visual inspection, mainly look at the following:

(1) Is there a disconnection?

(2) Discrete components, such as resistors, electrolytic capacitors, inductors, diodes, transistors, etc., are disconnected.

(3) Whether the printed board connection on the board is broken or stuck.

(4) Check the components for solder joints, solder joints, and plugs.

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