HITACHI Hitachi maintenance man-machine interface, HMI solve HITACHI Hitachi Troubleshooting: black screen, the video, the touch screen unresponsive or slow reactions, content deranged, can not enter the system interface, no backlight, backlight dark, backlit without character, can not communicate , button no response; HITACHI Hitachi HMI common models: PWS500S-LED, PWS520S-LED, PWS700T-STN, PWS700X-STN, PWS1711-STN, PWS1711-CTN, PWS1760-CTN, PWS3260-FTN, PWS3260-DTN, PWS3260 -TFT, PWS3760-TFT and other maintenance process: Step One: Ask the user equipment failure; the second step: the user's failure to describe, analyze the reasons causing this failure; third step: Open in need of repair equipment, make sure to be damaged The device, analyze the feasibility of recovery of maintenance; fourth step: work based on the location of the device is damaged, view and analyze the circuit works, to find out the cause of damage to the device; fifth step: contact with customers, reported on the repair price, solicit the views of the customer service; Part VI: Looking for the original model to replace the device; Part VII: The following are excluded confirmed case of equipment failure, power testing. Service features: enterprise service operation, to provide ongoing support services, free checking, line repair price confirmation by the customer acceptance and then repair, fast, excellent price