| 摘要 |
PROBLEM TO BE SOLVED: To protect a control board from overvoltage supply or from noise or the like due to static electricity, to reliably prevent malfunctions of a main control means or auxiliary control means when overvoltage occurs, and to smoothly restore the suspended function of the control means after overvoltage is eliminated. SOLUTION: Overvoltage determining means 39c, 46c, 40b, 43b, 42b to determine whether or not DC voltage generated at a power source feed unit 81 has reached an overvoltage are provided in a maine control means 50 and auxiliary control means 60, 70-72, respectively. When it is determined by these overvoltage determining means that voltage is an overvoltage, CPUs of microcomputers 39a, 40a, 42a, 43a, 46a of the main control means 50 and auxiliary control means 60, 70-72 are initialized by a system reset signal SR of level 'L' outputted from the overvoltage determining means, following which control functions of a game are stopped so that all signals are not outputted from the microcomputers, and hence malfunctions of the means 50 and means 60, 70-72 due to the overvolatage of DC can be reliably prevented.
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