Power supply circuit mainly has two types of series type and switching type, basically by the oscillation, transformer, rectifier, filtering, voltage regulator and other parts of the composition. The role is to convert the AC city into a stable AC and DC voltage, to provide energy to the machine. The working current of the power supply circuit is large and generates a lot of heat, so the failure rate is high. Such as rectifier bridge, voltage regulator block, when the load is too heavy (i.e., too much current), the grid voltage is too high and the temperature is too high (e.g., poor heat dissipation), may cause damage to these components. So to install AC voltage regulator to stabilize the power supply voltage; installation of air conditioners to reduce the indoor temperature and regularly remove the dust inside the machine and so on. Take these measures can completely reduce the power supply part of the possibility of damage, but also greatly reduce the failure rate of the machine.
2, color ultrasound probe failure
Color ultrasound probe is a color ultrasound unique parts, its failure is unique, but not complicated. Usually the color ultrasound probe has a line array probe and a mechanical fan scanning probe. One of the mechanical fan scanning probe failure is more, common failure for fan scanning probe bubble, treatment is: exhaust, oil, in the book described in the treatment method, will not repeat here, another common failure is fan scanning probe does not turn, usually is the probe itself drive motor damage, this time to deal with the more troublesome, need to be sawed open the probe.
3, display part of the failure
Color ultrasound display part is actually a computer, host, monitor and photo monitor. The monitor consists of video amplification, scanning and display of several major components, it will be a high-resolution display of ultrasound images of the main machine, we feel that through practice, the monitor's faults more in the scanning part, which to line scanning the failure rate of the highest, and the power supply part of the similar line scanning part of the normal operation of the state of the high-voltage and high-current, which consumes almost half of the entire monitor of the electrical power, the normal operation of the monitor, there are a series of problems, and the monitor will not be able to detect the problem. In normal operation there are a series of heating components, such as: line output tube, line output transformer and line correction coil, etc., when the heat dissipation is poor, it can cause these components due to overheating and damage or make the circuit board welded.
4, keyboard failure
In fact, the keyboard of the ultrasound and computer is basically the same, repair ideas and methods and repair computer keyboard is basically the same. It is also composed of a variety of function keys and numerical letter keys, it is the ultrasound operation of more parts, due to the different manufacturers and models of the machine, the keyboard is also slightly different, but can be roughly divided into two kinds: one is composed of independent buttons and switches; one is the whole of the touch-type buttons, the latter for the recent products generally speaking. Keyboard is the most typical failure is poor contact, most poor contact is caused by dust, contact oxidation or touch switch in the conductive rubber damage, but the dust caused by poor contact is more common.
5, machine vibration caused by the failure
Medical ultrasound is a very complex electronic instrument, which has a lot of boards, plug-ins, wiring and so on. When subjected to large vibration, these plug-ins may be loose resulting in poor contact, so that the whole machine or part of the function of the machine can not work properly.