One: the most faulty is the power supply circuit
The power supply circuit mainly has two types of series 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.
Power circuit overhaul is mainly to check and repair these parts, understand the principle and role of the power supply circuit, then not litigation is an imported machine or a domestic machine, repair ideas and methods are the same, in fact, and the repair of other electrical appliances, such as televisions, computers, and other methods of thinking are very similar. Many damaged imported machines, with domestic components instead of receiving the desired results.
Two: repair display part and repair the computer is very similar
Color ultrasound display part of the computer is actually a computer, dedicated just: host, monitor and camera monitor.
Monitor by the 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 failure to appear in the scanning part, which to line scanning failure rate is the highest, similar to the power supply part of the scanning part of the line scanning part of the normal operation of the state of the high-voltage and high-current, which consumes the entire monitor almost It consumes more than half of the monitor's power, and has a series of heating components during normal operation, such as line output tubes, line output transformers, and line correction coils, etc. When the heat dissipation is poor, it can cause damage to these components due to overheating or make the circuit board welded.
We have repaired several EUB200 type ultrasound, the host works normally, the monitor is no light, only a vertical bright line, after repeated inspections found that the line scanning line correction coil due to high heat desoldering, re-welding troubleshooting, from which we can see that the temperature is too high can be caused by ultrasound faults occur in a number of places, so the ventilation and cooling of the B is very important, so that can be prevented before the fact, to better guarantee the normal operation of the machine. Ensure the normal operation of the machine. You can see that this part of the maintenance and computer maintenance is very similar.
Three: keyboard failure
In fact, the keyboard of the ultrasound and the computer is basically the same: the repair idea and method is basically the same as repairing the computer keyboard. It is also composed of a variety of function keys and numeric keys, it is the most part of the ultrasound operation, 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, generally speaking, the latter for the recent products. 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 the most common.
For example: we repaired a Myriad ultrasound DC-N2S, the failure phenomenon is that the monitor display is normal, but there is no echo image on the screen, the keyboard control failure. Check the host found fault, open the keyboard found too much dust in the keyboard, carefully cleaned the machine back to normal. This case fully explains the color ultrasound dust work is very important. Color ultrasound placed in the standard conditions are, with air-conditioning equipment, a thousand dry, ventilated, clean room, even so the color ultrasound but also regular dust maintenance (at least 1-2 times a year), which will greatly reduce the color ultrasound keyboard and other parts of the failure.
Four: Ultrasound probe
The ultrasound probe is a unique part of the ultrasound, and its failure is unique, but not complicated.
The usual ultrasound probes are the line array probes and mechanical fan scanning probes. One of the mechanical fan scanning probe failure is more, the common failure of fan scanning probe bubbles, treatment is: exhaust, oil, in the book described in the treatment method, will not be repeated here, another common failure is the fan scanning probe does not rotate, usually the probe itself is the drive motor damage, this time to deal with the more troublesome, need to be sawed off the probe.
Five: 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. Once, we repaired a All)-DA-SSD a 630. composite machine, the machine continuous Doppler does not work. Other functions are normal. Power on the inspection did not find a fault, re-cleaning plug-ins, the machine works normally. This case tells us that when we move the color ultrasound must be as little as possible its vibration, usually the color ultrasound casters of the lock switch must be locked, so as to avoid the machine sliding and other objects collision. To sum up, we can see that the color ultrasound faults vary greatly, sometimes make people dazzled and can't start, but the color ultrasound repair work also has its technical, scientific and regularity, as long as the serious analysis, meticulous search, and then the complexity of the fault can be eliminated. However, if there is a slight negligence, it will be more detours, and even cause more losses.