1. 1 fault-

1. 1. 1 fault phenomenon

9L-D probe has interference in color blood flow mode, while other probes and imaging modes are normal.

1. 1.2 fault analysis and solution

First, judge whether the probe is faulty, and take the probe to another VE9 for testing, and the display is normal. After the probe itself was eliminated, it was suspected that it was an environmental problem. The equipment was moved to other ultrasonic clinics for power-on detection, and the fault disappeared. Therefore, it is necessary to find the interference source to determine that the fault is caused by the equipment use environment.

There is no large electrical equipment around the clinic, so it is important to find the interference source of the clinic. Turn off all the electrical equipment in the clinic in turn, and the fault has not disappeared; Disconnect the power supply of the electrical equipment in the consultation room in turn. When the host plug of the report workstation is unplugged from the patch panel, the interference is reduced, and it is suspected that the interference source is in a certain link of the workstation power connection. Continue to disconnect the patch panel connected to the workstation, and the interference disappears. After repeated tests, it is confirmed that the image interference is caused by the power plug of the connecting station. Replace the power board and solve the problem.

The problem of ultrasonic image interference is complex, and the interference sources are various, such as the interference caused by power plug-in is rare. Therefore, all possibilities except ultrasound equipment must be considered when encountering this kind of failure.

1.2 Fault 2

1.2. 1 fault phenomenon

When using the console keyboard to input information, there is snowflake interference on the screen.

1.2.2 fault analysis and solution

Interference problems are mostly related to power supply. Because interference will only occur when using the keyboard, first check the USB input voltage of the keyboard, and the measurement result is normal. Test the host +5V output voltage, and the result is normal.

Check the keyboard again and find that the keyboard does not pop up smoothly and the sliding is blocked; When the console is raised, it is found that the protective grounding wire terminal under the keyboard has fallen off (Figure 1), and the grounding wire is stuck in the slideway. After repeatedly pushing and pulling the keyboard, it is found that as long as the bare wire of the ground wire touches the metal object screen on the shell, it will cause interference. After reconnecting and fixing the keyboard ground wire, the fault will be eliminated.

1.3 Fault III

1.3. 1 fault phenomenon

The interference between near field and far field appears in two-dimensional mode; In color mode, the whole sampling frame is a color scale. This kind of fault happens from time to time, and with the increase of use frequency, it seriously affects the use of equipment.

1.3.2 fault analysis and solution

According to the conventional method of eliminating interference, the probe was tested, the power supply was detected, the environmental impact was investigated, and the cleaning and maintenance were carried out, but the cause of the failure was not found. After repeated observation, it is found that when the temperature of the front end of the equipment rises, the fault appears obviously and stably, which is suspected to be the problem of the internal circuit and board card of the equipment. Refer to the signal transmitting schematic diagram (Figure 2) and receiving schematic diagram (Figure 3) of the front end of VE9, and find out the fault reason from the angle of ultrasonic signal.

According to the schematic diagram, the process of generating sound waves by the equipment is controlled by the front-end motherboard (GFI). It mainly controls the transmitting board (GTX) and the interface board (relay) to load coded high voltage, and informs the receiving board (GRX) to prepare to receive signals; When receiving signals, GFI controls relays, GRX and DRX to receive signals and process them. In the front panel, relays, GTX and GRX transmit or load analog signals. When receiving, GRX signals are transmitted to DRX through XD bus board, and after DRX, they are digital signals. There are 1 relay boards, 4 GTX boards, 2 GRX boards and 4 DRX boards in the host system. The GTX board and GRX board are connected with the relay board through two sets of XDBUS; These plates form 256 physical transmitting and receiving channels respectively, which control the scanning and imaging of different sound beam positions respectively.

Understand the functions and signal properties of the above components, and re-check the faults: ① The equipment is only connected with the 9L-D linear array probe with the same number of physical channels as the host, and the GTX position is changed in turn, and the interference position remains unchanged, so as to eliminate the emission interference; 2) Remove an XD bus board and observe the change of interference position. The interference position remains unchanged, and the missing part of the image still has interference. Make sure there is no problem with the analog signal of GRX: 3. Change the position of DRX board, observe the change of interference position, change the interference position, confirm that DRX board causes interference, and solve the fault after replacing and repairing the DRX board that causes interference.

2 startup exception

2. 1 failure-

2. 1. 1 failure phenomenon

If there is a high temperature alarm during the operation of the equipment, it will automatically shut down and restart. 2. 1.2 Fault analysis and solutions

According to the alarm prompt, the fault is caused by the protective restart of the system due to the high internal temperature of the ultrasonic host. Firstly, the ambient temperature in the clinic is detected, which is high but within the normal range; It is suspected that the cooling channel of the equipment is not smooth. Clean the air filters located directly below the bottom and at the rear side of the main engine respectively, re-test the machine and observe that the fault disappears.

Restarting overheat protection is a common problem of VE9, especially in summer and winter (with sufficient heating). In view of this kind of fault, we must pay more attention to the cleanliness of the equipment environment, maintain good heat dissipation of the equipment, do a good job in regular maintenance of the equipment, clean all filters in time, and carry out internal dust removal regularly. In the case of good external and internal cleanliness, if the equipment is still overheated frequently, consider detecting the cooling fan located at the bottom of the main engine. There has been an overheating restart failure caused by the stop of the cooling fan.

2.2 Fault 2

2.2. 1 failure phenomenon

The basic input and output system (BIOs) of the equipment machine restarts after self-checking the interface, and cannot enter the system.

2.2.2 Fault analysis and solutions

The abnormal startup of ultrasonic equipment is usually due to the failure of the computer as the back end of the equipment, such as the damage or poor contact of components such as memory, hard disk, graphics card and motherboard. The failure occurred after the equipment was pushed to the bedside of the ward for inspection, and the back end plate was suspected to be loose. Remove the left cover of the host computer, open the back-end chassis, plug and unplug the memory, graphics card and hard disk in turn, and plug and unplug the S-ATA cable connected to the hard disk again to solve the problem.

Ultrasonic back-end can be regarded as a powerful PC, and its hardware or software is abnormal, which often leads to abnormal startup of ultrasound equipment. In use, we should try our best to avoid the violent vibration of the equipment, keep the interior clean and reduce the occurrence of hardware failures. For software failures such as system crash, we should fully master computer knowledge and learn to use tools such as Ghost and USB flash drive to back up the system, so as to solve such failures in time and effectively.

2.3 Fault 3

2.3. 1 failure phenomenon

When the device is turned on, it repeatedly reads the progress bar and cannot enter the operating system. It is displayed as hwid = 0.

2.3.2 Fault analysis and solutions

The HWID of VE9 is stored in the chip of the host front-end motherboard (GFI), and the back-end of the machine will read the information on the GFI through the PCle line during the startup process. The failure of HWID = 0 is usually caused by abnormal communication between the front and back ends, and the failure of any party in the chain may cause HWID error. Plug and unplug the GFI board respectively, and fasten the PCIe cable to connect with GFI and BEP, but the fault still exists. Because of the manufacturer's permission setting, the dog can't judge the fault location through the error log in the background of the system without a special password. There are many equipments of the same model in the hospital. Now that the possibility of fault has been analyzed and judged, the corresponding hardware can be replaced by "replacement method" to eliminate the fault.

The first thing that comes to mind is the replacement equipment back end (BEP). Due to the modular design, it is not difficult to remove BEP from the host. Mark and remove all connections, install BEP of normal equipment on faulty equipment, and start testing. The fault has not been eliminated. After replacing the GFI board for testing, the fault still exists. Replace PCle cable, and the equipment will start normally after startup. After ordering to replace the same cable, the fault was solved.

The failure probability of connecting cables inside the equipment is relatively low, and the frequent shutdown and restart failure of VE9 is also solved by replacing PCle cables. Therefore, when repairing the fault when VE9 crashes and restarts, don't neglect to replace the relevant cables when replacing the equipment board can't solve the fault.

3 discussion

Color Doppler ultrasound has become a very important diagnostic equipment in hospitals, and its normal operation is very important. Through the maintenance of VE9 fault, the importance of preventive maintenance is fully proved, and the equipment should be kept in a good use environment and cleaned regularly. The equipment shall be independently powered and well grounded as far as possible.