Ultrasound probe part of the array element is not completely damaged and there is poor contact within the probe image of the failure phenomenon, see the figure below.
Failure to analyze and cause:
The arrow in the figure indicates that "1" in the shadow of the array element attenuation, but not completely damaged, this kind of situation can continue to use, but also slowly damaged seriously.
The arrow in the figure indicates "2" where the array is completely damaged, neither transmitting nor receiving. This is often caused by a problem with one of the chips in the probe.
The arrow in the figure indicates that "3" at the dotted line ray, there is a continuous short or poor contact in the probe.
Troubleshooting:
The arrow in the figure indicates "2", the maintenance program for the array crystal failure: First, we must find the problem crystals, measure the power supply voltage of each crystal or each group of crystals, because the normal crystal or crystal group power supply voltage is similar, but the problem crystals appear to power supply voltage is reduced. Finding the problem crystals is more time-consuming and labor-intensive because of the number of items that need to be checked. Another thing to add is that a similar failure image can occur when the probe has poor contact with the probe board, and we can switch probes and replace the probe slots to differentiate.
The arrow in the figure indicates "3", for the probe internal wire broken maintenance program: open the outer holster, the total shielding line lateral cut, jump out of the broken line, welded, wrapped in a layer of transparent tape, with a multimeter to measure whether it is on, on, the shielding of this wire will be connected to a good and wrapped in tape. Trial normal before welding the outermost layer of the total shielding line, the outer holster with a high-voltage power supply plastic tape for fixed.
Failure phenomenon two:
Part of the complete array element damage, do not vibrate and do not receive the fault image in the formation of a tooth-shaped black area near the sound surface of the probe, when more than one adjacent array crystal damage, will also form an inverted triangle of black areas.
Failure analysis and processing:
As can be seen, the probe corresponding to the black area of the array crystal has been completely damaged. In actual use, these array elements will successively appear in different degrees of attenuation, no-load in the near field will appear similar to the pulse board single-channel reception failure of the dark channel, in the use of the process of the seriousness, and finally completely damaged. The black zone formed by the probe array element failure is not regular in spatial distribution relative to the black zone formed when the probe board and pulse board fail.
Troubleshooting:
This type of probe failure of more crystals, maintenance is more difficult, it is recommended to replace the entire array element crystal module or replace the probe. It should also be noted that when the probe is in poor contact with the probe board will also appear similar fault image, we can switch the probe and replace the probe slot to distinguish.
Failure phenomenon three:
Probe has bubbles probe has bubbles failure phenomenon.
Failure analysis and handling:
After the probe bubbles, whether it is empty or playing the image is a clear black area, by squeezing the protective layer on the surface of the probe, you can make the bubbles in the matching layer to move and change, the image of the black area will follow the movement and change.
Troubleshooting:
Acoustic lens bubble repair program, the use of liquid silicone rubber as a probe acoustic lens repair material and acoustic lens layer and the matching layer between the adhesive material. With liquid silicone injected into the debonding place and drive out the air bubbles, with gauze tape to tie the probe tightly placed one day and then loosened, the problem disappeared.
Trouble phenomenon four:
Slot oxidation near the surface of the probe, there are a number of different widths - dark stripes, and the distribution does not have the spatial regularity. There is a continuous dark stripes composed of the width and account for the overall width of the probe 1/10 of the dark stripes, and did not form an inverted triangle black zone, slot oxidation fault display.
Failure analysis and causes:
As the dark streaks do not have the regularity of the spatial distribution, basically can rule out the channel failure, so the point of failure in the channel before, both the probe array element to the probe board high-voltage switch on the channel and the array element switching, which is related to the devices between the two relays, slots, the probe socket, the probe wire, array element. And from the image itself, the most likely should be the probe array element aging attenuation of the fault, and in fact, by repeatedly unplugging the probe, found that the dark streaks have been reduced: replacement of the probe slot, found that the formation of the dark streaks of nature and location are not the same, so that can be ruled out is the possibility of aging attenuation of the probe array element.
Troubleshooting:
It should be noted that, due to the probe slot electrical contact points long after the contact will be poor, oxidation phenomenon in the humid environment, resulting in greater impedance, so the echo returned after the insertion of the probe is weakened, many times after pulling out the probe, the contact performance of the slot and the probe has been improved, and some of the dark stripes disappeared.
Failure phenomenon five:
Active interference Active interference failure phenomenon.
Failure analysis and causes:
When the place where there is foreign interference, the gain key to the maximum, you can see a burst of regular snowflakes or ripples of foreign interference. This fault maintenance program: you can move this ultrasound machine away from the interference of the place to try, such as no such interference, both proved to be active interference.
Troubleshooting:
Such active interference may come from the attachment of large-scale radiological equipment, magnetic **** vibration, ultrasonic lithotripter, high-voltage transformers, etc., it is also possible that the equipment dedicated ground line is cut off and lost protection. Can be better place to use, or in the original place to re-check the reliability of the ground, or refer to the next door to stabilize the power supply, re-arrange the power line.
Failure phenomenon VI:
Probe channel plate near the field there are four long dark areas, the display image after applying the coupling agent.
Failure analysis and causes:
Characterized by four notches near the probe acoustic transducer, similar to the probe part of the array element damage failure image, but the notch arrangement has a regular spatial distribution, near the probe acoustic surface or there will be an obvious gap, seriously affecting the clinical use. The probe will be swept obliquely, if the image gap will also move is the channel board bad, if the image gap is fixed is the probe array element crystal damage.
Troubleshooting:
"1" at the channel board failure of the maintenance program, due to the channel circuit board each - - block is common, the general machine has 36 - 48 blocks of channel boards, through every 4 channel boards in order to move the plug, the above faulty image will be moved sequentially, and so on, you can find out which The four faulty channel boards can be identified and replaced. "2" at the probe array crystal damage repair program according to the above failure phenomenon two reference overhaul.