Four Solutions to Address Ultrasound Equipment 'Crash' Failures

Ultrasonic equipment“Crash”Malfunction is similar to that of a computer, sometimes it can be solved by turning off and on again. However, sometimes“Crash”the phenomenon cannot be eliminated by any emergency measures. In this case, repair workers should not be anxious, but should patiently and carefully find“Crash”the cause of the malfunction, and thus eliminate“Crash”the malfunction.“Crash”故障。

Malfunction Phenomenon 1

Power-on self-test failed, and the machine could not start. After opening the front cover of the machine and powering it on, measure the DC operating voltage of the machine,VP2the voltage is equal to+3.8V，the normal value isVP2=+V5。Because this power supply is related to the ultrasound front-end board and channel board, first unplug the probe, then turn on the machine, the machine still cannot start. Check the machine front-end channel board

查机器前端通道板CB0-CB8There are eight in total, first unplug one of them,4，then turn on the machine, the machine passes the self-test, detectionVP2=+5Vremains unchanged. Restore the front-end channel board, when it exceeds5，start the machine,VP2the voltage will be lower than4.5V，sometimes as low as4.3V，the machine self-test fails, and“Crash”故障。

Analyze the reason, is itVP2DC ten5Vpower supply load capacity is poor“Crash”problem. Contact the Philips manufacturer and borrow a new power supply box for testingVP2=+5Vremains unchanged, the machine passes the self-test, and works normally,“Crash”fault eliminated. Therefore, it is considered that this fault isVP2poor power supply load capacity, causing a large+5Vvoltage drop in the power supply during power-on, thus causing the power-on self-test to fail,“Crash”故障。

Malfunction Phenomenon 2

Image“freeze”，the operation keys are not working properly. Turn off the machine and then turn it on again, the machine fails to start, the monitor screen is“gray screen”，that is, there is no display. Using the ultrasound repair backup boot disk cannot eliminate“Crash”the fault. Check each group of DC operating voltages inside the machine, all are normal. Suspecting machine software failure, but when reinstalling the machine software, it always stops halfway through the software installation and does not continue, so it cannot be solved“Crash”problem.

Finally, the machine motherboard was checked, and it was found that the memory stick on the motherboard was problematic after replacement and inspection. After changing a memory stick, the machine“Crash”fault was eliminated. After powering on, the machine self-test and operation are normal.“Crash”The cause of the fault is that the machine motherboard memory stick was damaged. This repair experience tells us that sometimes handling“Crash”problems should be considered comprehensively, and even more complicatedly.

Malfunction Phenomenon 3

During normal operation, the machine often malfunctions irregularly“Crash”，sometimes after turning off and then turning on again, the machine returns to normal operation. But sometimes when it is turned on again, the machine still“Crash”。Sometimes“Crash”when a fault occurs, wait a moment and the machine may automatically recover to normal. At the beginning, it was thought to be more complicated, and all the suspicious places had taken measures, but none of them could eliminate“Crash”故障。

Later, during random observation, it was found that during the normal operation of the machine,“freeze”image, after measurement, press the freeze button to release“freeze”image, but this machine cannot return to the real-time inspection state. Several experiments show that after the image is frozen and the necessary measurements are made, the next step of inspection cannot be performed. Therefore, it is suspected that the machine freeze button is problematic.

Open the cover and check, and find that the freeze button of the machine, due to frequent operation and use, has cracks in the phosphor bronze片, causing the elasticity of the button switch to change. During the normal operation of the machine, after pressing the freeze button, the switch closes, the image freezes, and the button is released. The button switch should immediately disconnect to allow for other operations. However, due to the crack in the phosphor bronze片 of this switch, the elasticity is insufficient, and when the external force of the button switch is released, the contact does not immediately bounce back, but bounces back very slowly. The time required for this bouncing process is sometimes shorter and sometimes longer, and during this time, it is not possible to operate other function keys, resulting in“Crash”故障。

Solution: Due to the cracks in the phosphor bronze片 of the switch, the switch bounce is poor, so this switch cannot be used anymore. Also, because this switch is quite special, it cannot be bought on the market, so a switch that is not frequently used is found from other positions on the keyboard and replaced, and since then the machine“Crash“The fault has never appeared again.

Malfunction Phenomenon 4

The machine self-test fails and a“Crash”fault occurs, and repeatedly turning on the machine cannot solve the problem, making the machine unusable. After investigation, it was found that the cause of“Crash”the malfunction is due to thecAPTuREkey on the keyboard cannot be reset, and the reason why the key cannot be reset is that the tissue paper used during the inspection has poor quality, with many scraps and ends. During the use process, these scraps and ends are scattered on the keyboard, and these scraps and ends are like fine sand, which gets stuck in the button switch, causing the switch to be stuck in the pressed position when pressed, and the switch cannot automatically reset when the button is released.

During the machine's power-on self-test, it detects these switches that have not returned to their original state, and issues an alarm indicating a malfunction, preventing the machine from proceeding.“Crash”The machine malfunctioned. After disassembling the machine and cleaning the keyboard, the malfunction was resolved. This was caused by dust.“Crash”故障。

This example shows us that sometimes“Crash”malfunctions don't need to be overcomplicated. Regular machine maintenance can prevent malfunctions during use, avoiding patient backlog and maintaining orderly clinic operations.

This information originates from the internet. Please contact us for removal if there is any infringement.