| 摘要 |
PROBLEM TO BE SOLVED: To precisely inspect a possibility whether or not a main board is replaced fraudulently. SOLUTION: A fluorescence layer 107 is formed in the end face of main board 100. On this account, a fraudulent player is hard to notice presence of the fluorescence layer 107. When the main control circuit 33 is going to be changed with an illegal one together with the main board 100, the fluorescence layer 107 cannot be placed in the end face of illegal main board 100. Therefore, when the main control circuit 33 is replaced with the illegal one together with the main board 100, because the probability that the fluorescence layer 107 is not arranged in the end face of the main board 100 extremely rises, the inspector can use black light, and irradiates the end face of main board 100 with near ultraviolet rays from the outside of the main board box 60. Based on the inspector's visual confirmation as to whether end face of the main board 100 flashes in blue, the inspector can identify the possibility of illegal replacement of the main board 100 precisely. COPYRIGHT: (C)2009,JPO&INPIT
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