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    • 7. 发明专利
    • PUBLIC TELEPHONE SET
    • JPH066490A
    • 1994-01-14
    • JP18481592
    • 1992-06-19
    • TAMURA ELECTRIC WORKS LTDNIPPON TELEGRAPH & TELEPHONEANRITSU CORP
    • IWASA KIKUMAROHARA HIRONOBUTAKADA SHINJI
    • H04M17/00
    • PURPOSE:To repair a faulty public telephone set quickly by informing automatically a management number of the public telephone set to a prescribed sensor together with fault information when a liquid crystal display element of the public telephone set is destroyed and cannot be used. CONSTITUTION:A CPU 5 of a public telephone set discriminates the detection of destruction of a liquid crystal display element LCD 9. That is, an applied voltage to a port P0 of the CPU 5 is lost and it is discriminated to be YES, whether or not the public telephone set is busy is discriminated and when busy, a prescribed interrupt protocol is implemented to forcibly interrupt the call. Then a prescribed dialing protocol is applied to a center monitoring a fault of each public telephone set. When a reply from the center is obtained, LCD destruction information is sent to the center. Furthermore, in this case, the public telephone set management number and various setting information are sent altogether so that the installed location of the public telephone set and the set function information sending the LCD destruction information are identified by the maintenance personnel.