Pre-equipment inspection and testing → design troubleshooting plan → troubleshooting implementation → establish formal system equipment file → accept maintenance application → dispatch and issue documents → prepare instruments and equipment → arrive at the site → repair or replace spare parts → fill in documents → customer maintenance inspection and signature (if it fails, return to "establish formal system equipment file") → feedback adjustment (if it fails, return to "establish formal system equipment file") 2.

Pre-inspection and testing of equipment → design of troubleshooting scheme → implementation of troubleshooting → establishment of formal system equipment files → daily inspection and maintenance → monthly and quarterly inspection and testing → annual inspection and testing (in this process, it may be necessary to return to daily inspection and maintenance and monthly and annual inspection and testing) → quality and safety inspection.