Objective To study and improve medical equipment fault diagnosis techniques by utilizing system state detection methods to quickly and accurately diagnose faults in medical equipment without schematics, thereby enhancing the efficiency and accuracy of equipment maintenance. Methods This study employed the system state detection method, using online testers and digital oscilloscopes to establish a system state database for the equipment. The study involved 20 common medical devices from a hospital, including blood oxygen monitors and laminar flow fan frequency converters. When equipment failures occurred, traditional fault localization methods were first used to narrow the fault range to the board level. Subsequently, online testers and digital oscilloscopes were used for component comparison testing, combined with previous successful cases for fault diagnosis. Results Among the 20 medical devices, 18 were successfully diagnosed and repaired, achieving a fault diagnosis accuracy rate of 90%. Specific cases included successfully eliminating ADC chip faults in the PM9000 monitor's blood oxygen board and E2PROM faults in the laminar flow fan frequency converter. By establishing a system state database and case database, the efficiency of equipment fault diagnosis was significantly improved, with the average diagnosis time reduced by 30%. Conclusion System state detection can effectively enhance the accuracy of medical equipment fault diagnosis and should be further promoted to optimize maintenance management.

KEY WORDS: system status detection  /  fault diagnosis  /  medical equipment  /  on-line tester  /  maintenance efficiency