| 摘要 |
PROBLEM TO BE SOLVED: To prevent a control board on which regular electronic components are mounted from being detached and replaced with a fraudulent control board on which altered electronic components are mounted in the board case structure of a game machine. SOLUTION: The control board (13) is provided with a conductive part (14) for conducting tightening screw holes (13a, 13b), a voltage generation means to the respective tightening screws (16a, 16b), and an abnormality detection means (18) for detecting the interruption of conduction between the tightening screws (13a, 13b). When the control board (13) is detached from a case main body (11) and a voltage between the tightening screws (16a, 16b) becomes practically "0", abnormality signals are transmitted from the abnormality detection means (18). COPYRIGHT: (C)2008,JPO&INPIT
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