| 摘要 |
PROBLEM TO BE SOLVED: To prevent the fraudulent change of setting of the probability of winning a winning combination to a higher value by inserting a fraudulent device into the gap between an exterior front door and a body casing. SOLUTION: A main control board 20 of the slot machine 1 changes of the setting of the probability of a lottery for selecting a winning combination based on the input operation from a setting change button 141 only when the result of detection of an open/close detection switch 211 in a power supply unit 24 indicates a front door 204 for the power supply unit is closed and when a setting key engagement part of a setting cylinder lock 220 is at the on-position. As a result, the fraudulent change of setting of the probability of winning the winning combination to a higher value by inserting the fraudulent device into the gap between the exterior front door 3 and the body casing 2 can be prevented, whereby the fraudulent play can be prevented and the management of play facilities can be improved. COPYRIGHT: (C)2009,JPO&INPIT
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