1 fault-
1.1 fault phenomenon
Endoscopy system can display the image after powering on, but the image is off-color or green, or red, or blue.
1.2 Failure Analysis and Maintenance
(1) According to the imaging system process schematic (shown in Figure 1) in accordance with the principle of easy to difficult, first check the host, monitor YPbPrRGB settings are consistent to check whether the electronic endoscopy charge-coupled components (charge-coupled device CCD) damage caused by the phenomenon. ) damage caused by the phenomenon. Replacement of a normal endoscope in other hosts, adjust the CCD automatic white balance after the failure remains.
(2) As the hospital's endoscopy host is placed on the tower host and monitor through the RGB adapter cable adapter failure may lead to image color deviation, so the host MONITOR port cable directly connected to the monitor failure remains Rule out the problem of the RGB adapter cable Replacement of the MONITOR cable Failure remains.
(3) Re-plug the CLV260 cold light source and the image processing center connected to the cable Image quality did not improve In order to prevent cable failures, replace the other host using the normal cable Failure remains.
(4) to rule out the possibility of peripheral failures, the problem directly to the host itself. At this point, through careful observation can be seen at the end of the electronic endoscopy issued by the light is not flashing white light, but with the color of the light This is more certain that the cold light source failure. Open the cold light source housing connected to the power supply after the boot, hear the machine on the high-voltage discharge board "pop" discharge sound, the xenon lamp is lit, but the grating turntable is slower and slower until it stops. The light source unit is a device that provides in vivo illumination for the light transmitted by the endoscope's light guide beam. Because the image generation of this series of endoscopes is based on a sequential scanning method, as shown in Fig. 2, the sequential imaging endoscopes can form a color image by means of an RGB grating. In order to achieve a clear image, three signals are added together, so the light source from the xenon lamp passes through the high-speed rotating RCB grating, and the absence of any one of the colors results in a deviated image. In order to prevent oxidation, loosening caused by the grating on the motor power supply instability, re-plug the motor power supply line end, online measurement of the voltage is normal, but the grating is still turning - a moment on the stop does not turn. This equipment has been put into use 6a, grating, circuit boards are covered with dust to consider the rotor shaft may be stuck by the dust, so the host of dust, especially the light shed motor shaft. After powering on the grating at this point in the rapid rotation connected to the endoscopic image shows that everything is normal.
2 fault two
2.1 fault phenomenon
Olympus 260 endoscopy system with ERBE VIO electrosurgery workstation to do endoscopic submucosal dissection, the use of electrocutaneous mode is normal and the use of electrocoagulation mode when the monitor appeared black screen.
2.2 Failure Analysis and Repair
Factors that cause interference failure can be divided into two categories of equipment failure interference and external intrusion interference. Equipment failure interference refers to the equipment itself failure caused by the interference that the system intrinsic factors interference. This type of failure is mainly caused by the system's power supply, monitor and so on. External intrusion interference failure refers to the video signal in the transmission process, from the outside interference signal intrusion into the video spectrum caused by image interference failure 21
First check the Olympus 260 endoscopy system, ERBE VIO electrosurgical workstations, crane tower grounding and power grounding after checking found that the grounding are good, which ruled out the ground potential imbalance caused by the interference. Endoscopy host and high-frequency electrical equipment with power outlets, using the replacement method to replace one by one ERBE VIO electrosurgical workstations, 260 image processing systems, cold light sources, monitors and various connections to investigate the causes of equipment failure, looking for sources of interference. In this process found that the RGB video adapter metal part of the mutual contact will have a black screen phenomenon with insulating tape wrapped around the mutual insulation after the test found no black screen phenomenon
monitor normal use for a period of time after the same black screen phenomenon. Repeat the above troubleshooting program, in order to prevent the RGB adapter line is broken inside Replacement of a new adapter line is still a black screen, which indicates that there is a new source of interference, at this time, the only thing that has not been replaced is the argon knife connecting line, careful observation of the connecting line, and found that the root near the output end of the machine outer skin broken and broken inside A light pull on the break. Replacement of a new connection line did not appear again after the phenomenon of black screen.
3 fault three
3.1 Fault phenomenon
Olympus 260 endoscopy system host connected to the ultrasound mirror can be used normally connected to the enteroscope black screen with text but no image display. 3.2 Failure Analysis and Repair
Replacement of different types of endoscopes in other machines used in the normal endoscopes, test found that the only connection to ultrasound mirror can be image display. While connecting the enteroscope and gastroscope are no image display, which excludes the endoscope itself. The electronic endoscopy light guide is connected to the image processing center through the connecting cable. Considering that the internal wiring of the electrical connector of the electronic light guide is different between the ultrasonoscope and the gastrointestinal mirror, the failure of the connecting cable itself will lead to the appearance of this phenomenon. Replace a new connecting cable after the fault is removed.
4 Fault 4
4.1 Fault phenomenon
Endoscopic image dark.
4.2 Failure Analysis and Repair
Firstly, check whether the endoscopic light guide beam is broken or partially broken monitor brightness, contrast, host keyboard settings are correct, and whether the light source brightness level is set correctly. Secondly, if the life of the bulb to, will also affect the image at this time need to replace the bulb. Excluding the above problems, it is necessary to consider the possibility of light source internal dust masking the light path leading to a decrease in brightness at this time you need to open the light source shell, the internal light path for dust treatment.
5 Summary
As a hospital medical equipment maintenance personnel, first of all, we need to understand the basic working principle of the maintenance equipment need to think clearly on the equipment failure phenomenon is carefully analyzed. In the maintenance process in accordance with the first simple and then complex first peripheral after the central principle of analysis by level according to the working principle to determine the real cause of the failure. In addition, the maintenance should be bold and careful to dare to do so in order to better carry out fault judgment and troubleshooting in order to quickly solve the actual problem at a lower cost.