PURPOSE:To display the name of the fault information or the name of a station to be maintained after changing optionally them, by using a visible display panel containing the light emitting elements that can display an optional name of the fault information or the station to be maintained supplied from a maintenance terminal in the form of alphanumerics. CONSTITUTION:A visible display panel is capable of display of 64 types of fault information names and the names of station to be maintained as well as the information on the occurrence of each fault. A microcomputer 6 identify the presence of the request display fault information. If this information is confirmed, a fault occurrence display element driving part 8 is controlled to turn on or off a fault occurrence display element 4. A fault information name display element 3 and a display element 2 for station to be maintained contain the light emitting diodes that can display the alphanumerics.
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