1.1 Failure-
1.1.1 Failure Phenomena
9L-D probe in the color blood flow mode has interference, the other probes and imaging modes are normal.
1.1.2 Failure analysis and solution
First of all, to determine whether the probe failure, the probe to another VE9 for testing, the display is normal. Excluding the probe itself, suspected that the use of environmental issues, the equipment will be moved to other ultrasound clinic boot test, the fault disappears. This is to determine the fault is the use of equipment environment triggered, need to find the source of interference.
There is no interference with large electrical equipment around the clinic, focusing on the clinic to find the source of interference. Turn off all the electrical equipment in the clinic in turn, the fault has not disappeared; in turn, disconnect the power supply connection of the electrical equipment in the clinic, when the report of the workstation host plug from the power supply plug off, the interference is reduced, suspected of interfering with the source of power supply connection of the workstation of a certain part of the link. Continue to disconnect the power plug connected to the workstation, interference disappeared. Repeat the test to confirm that the image interference is caused by the power plug connected to the workstation. Replace the power supply plug, the fault is solved.
Ultrasound image interference problem is more complex, the source of interference can be described as strange, such as this interference caused by the power supply plug or relatively rare. Therefore, in the event of such a failure must be outside the ultrasound equipment may be taken into account.
1.2 Failure two
1.2.1 Failure phenomenon
When using the console keyboard to enter information, the screen has snowflake interference.
1.2.2 Failure Analysis and Solution
Interference problems are mostly related to the power supply, due to interference only occurs when using the keyboard, first check the USB input voltage of the keyboard, the measurement results are normal; test the host +5V output voltage, the results are normal.
Check the keyboard again, found that the keyboard pop-up is not smooth, sliding blocked; elevated operating table, found that the keyboard under the protection of the grounding ground terminal off (Figure 1), the grounding wire stuck in the slide. Repeatedly push and pull the keyboard found that as long as the ground wire exposed metal wire touching the chassis of the metal objects on the screen will appear interference, reconnect the fixed keyboard ground troubleshooting.
1.3 Failure three
1.3.1 Failure phenomenon
Two-dimensional mode from the near field to the far field through the interference; color mode, the entire sampling frame for the color patch. This failure occurs intermittently, the frequency of occurrence with the use of increasing, seriously affecting the use of equipment.
1.3.2 Failure analysis and solution
According to the conventional method of eliminating interference test probe, detection of power supply, troubleshooting the environmental impact, cleaning and maintenance, failed to find the cause of the failure. After repeated observation found that the equipment front-end temperature increases, the fault is obvious and stable, suspected equipment internal circuitry, board problems. Referring to the VE9 front-end signal transmitting schematic (Figure 2) and receiving schematic (Figure 3), from the ultrasonic signal point of view to find the cause of the failure.
According to the schematic diagram, the process of generating sound waves from the device is controlled by the front-end motherboard (GFI) front-end of the various boards work together. The main control of the transmitter board (GTX) and interface board (RELAY) to load the encoded high voltage, and notify the receiver board (GRX) to prepare to receive the signal; in the reception of the signal, the GFI control RELAY, GRX, DRX to receive the signal and processing. In the front-end boards, RELAY, GTX, GRX passes or loads analog signals, and when receiving, the GRX signal is transmitted to DRX through the XD BUS board, and after DRX it is a digital signal. Host system *** there is a RELAY board, 4 GTX boards, 2 GRX boards, 4 DRX boards; GTX boards and GRX boards are connected to the RELAY board through 2 sets of connecting boards (XDBUS); these boards are composed of 256 physical transmit and receive channels, respectively, to control the scanning and imaging of the different acoustic beam positions.
Understand the function of the above boards and the nature of the signal, to re-examine the fault: ① equipment is only connected to the same number of physical channels with the host 9L-D line array probe, in order to replace the GTX position, the location of the interference does not change, to rule out the emission of interference; 2) remove a XD BUS board, observe the interference location changes, the interference location does not change, the missing image of the Part of the interference is still there, to determine the analog signal of the GRX is not a problem: 3 change the location of the DRX board, to observe the change in the location of the interference, the interference position changes, confirm the DRX board triggered interference, replacement of the maintenance of the interference generated by the DRX board after the fault is resolved
2 startup anomalies
2.1 Failure to -
2.1.1 Failure phenomenon
High temperature alarm occurs during the operation of the device, automatic shutdown and restart.2.1.2 Failure analysis and solution
According to the alarm prompts, the failure is due to the ultrasound mainframe internal temperature is too high resulting in the system's protective restart. First of all, detect the ambient temperature in the clinic, the temperature is high but in the normal range; suspected equipment cooling channel is not smooth, respectively, located in the bottom of the host directly under the rear side of the air filter, retry to observe, the fault disappears.
Overheating protection restart is a common failure of the VE9, especially in summer, winter (sufficient heating) high incidence. For this fault, we must pay more attention to the cleanliness of the environment in which the device is used, so that the device maintains good heat dissipation, and do a good job of regular maintenance of the device, timely cleaning of the various filters, regular internal dust removal. To maintain a good external and internal cleanliness, if the device is still frequent overheating failure, consider testing the cooling fan located at the bottom of the host, there have been overheating due to the cooling fan stalled restart failure occurred.
2.2 Failure two
2.2.1 Failure phenomenon
The device machine Basic Input OutputSystem (Basic Input OutputSystems, BIOs) self-test interface after the reboot, can not enter the system.
2.2.2 Failure Analysis and Solution
Ultrasound equipment startup abnormalities, usually caused by the computer as the back-end of the device part of the failure, such as memory, hard disk, graphics card, motherboard and other components of the damage or poor contact. This failure occurred after the device was pushed to the ward for bedside examination, and it was suspected to be caused by the loosening of the rear-end board card. Remove the left side cover of the host, open the rear chassis, sequentially re-insert the memory, graphics card and hard disk, in re-insert the S-ATA cable connecting the hard disk after the failure to solve.
Ultrasound back-end can be regarded as a powerful PC, its hardware or software abnormalities, often leading to ultrasound equipment can not start normally. In use to try to avoid severe vibration of the device, to maintain good internal cleanliness, to reduce the occurrence of its hardware failure. For the system crash and other software failures, to fully grasp the computer knowledge, learn to use Ghost, U disk boot and other tools to do a good job of system backup, so as to timely and effective solution to this type of failure.
2.3 Failure 3
2.3.1 Failure phenomenon
The device boot repeatedly read the progress bar, can not enter the operating system, displayed as HWID = 0.
2.3.2 Failure analysis and resolution
VE9's HWID is saved in the host front motherboard (GFI) chip, the machine in the startup process, the rear will be through the PCle CABLE, and the machine can not enter the operating system. end will read the information on the GFI through PCle CABLE. The failure of HWID = 0 is usually caused by abnormal communication between the front and rear ends, and the failure of any party in the chain may result in the HWID error. Re-plug and unplug the GFI board respectively, and tighten the connection between PCIe CABLE and GFI and BEP, the fault remains. Because of the manufacturer's permission settings, in the absence of a dedicated dongle, it is not possible to determine the location of the fault through the system's background Error log. The hospital has more than one device of the same type, since it has analyzed and judged the general possibility of failure, can use the "replacement method" to replace the corresponding hardware one by one in order to eliminate the problem.
The first thing that comes to mind is to replace the back-end of the device (BEP). Due to the modular design, it is not difficult to remove the BEP from the mainframe, marking and removing all the wires, and installing the BEP of the normal device in the faulty device, and then booting up the device to test it, and the faults were not eliminated. Replace the GFI board and test, the fault remains, replace the PCle CABLE, power on the device after normal startup. After ordering the same type of cable to replace, the fault is solved.
The probability of the device's internal connection cable failing is relatively low, and the VE9's frequent crashes and reboots were solved by replacing the PCle CABLE. Therefore, when repairing VE9 crash and reboot failures, don't neglect to replace the relevant cables if replacing the device boards fails to solve the problem.
3 Discussion
Color ultrasound has become a very important diagnostic equipment in hospitals, and its normal operation is critical. Through the repair of VE9 failure, full proof of the importance of good preventive maintenance, to maintain a good environment for the use of equipment, regular cleaning. Equipment operation as far as possible using independent power supply and good grounding.