| 摘要 |
PROBLEM TO BE SOLVED: To prevent a circuit board from illegally being exchanged together with a whole board box. SOLUTION: A security chip 22 is assembled to a rear board of a main set 20 from its front with a screw 25. This security chip 22 is exchanged by loosening the screw 25. A board box is assembled undetachably to the security chip 22 from the back with a caulking screw 33. With this structure, a difficult operation of loosening the caulking screw 33 is necessary for removing a board box from the main set 20 and therefore, this structure prevents a circuit board for reward balls from illegally being exchanged together with the whole board box. COPYRIGHT: (C)2008,JPO&INPIT
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