Five Steps to Fixing Ultrasound Equipment

Understanding the fault involves inquiring with the instrument operator (or other maintenance personnel) about the situation before and during the fault occurrence, such as whether the voltage was normal, whether there were any unusual smells or sounds, whether the fault occurred suddenly or gradually, whether the fault is intermittent, the age of the equipment and the usage environment when the fault occurred, and which components were replaced or which parts were adjusted, etc. Additionally, by operating the machine oneself and observing the manifestation of the fault, it provides a basis for analyzing the fault and increases repair speed.

Fault analysis is based on the fault phenomenon, analyzing and judging the cause of the fault and its approximate location in the circuit. This requires a prerequisite: familiarity with the system composition and circuit working principle of the instrument. Only then can one analyze the possible faulty circuit parts from a practical standpoint and, based on accumulated (or others') maintenance experience, quickly reach a relatively accurate conclusion.

Ultrasound scanners generally consist of pulse control and generation circuits, ultrasonic signal receiving and processing circuits, digital scan conversion circuits, digital image processing circuits, ultrasonic transducer parts, and monitor circuits, etc. Even without the circuit diagram, one should be familiar with these typical circuits of the ultrasound scanner and analyze it based on the block diagram; however, this situation will require more time and effort than having the diagram.

Fault inspection is to narrow down the fault range through testing after analyzing the problem, and finally determine the specific location of the fault. The basic methods of fault inspection can borrow from the four methods of Traditional Chinese Medicine: "looking, listening, asking, and feeling the pulse". Looking: visually inspecting components (circuit boards) for signs of burning, discoloration, cracking, leakage, poor soldering, short circuits, or detachment. Checking for sparks or smoke when powered on. Listening: using the nose to smell for unusual odors. Asking: inquiring with relevant personnel about the situation before and during the fault occurrence as mentioned earlier. Feeling the pulse: inspecting and measuring the fault location. The basic methods for detecting faults are: exterior first, then interior; power supply first, then main circuit; circuit boards first, then circuit units.

IV. Fault Handling

Fault handling: after identifying the fault, the fault should be eliminated by replacing the failed components and adjusting the out-of-adjustment components. Be extremely careful not to damage the printed circuit board or cause short circuits between components.

After the instrument is repaired, the maintenance work is not yet complete. First, the circuits potentially affected by the fault should be checked to see if there are any remaining faults or potential problems. Second, the repaired ultrasound scanner must undergo index debugging and verification, adjusting the instrument to its optimal operating state, at which point the entire repair work is considered complete.

VI. Summary

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