The subject innovation relates to a ROM board power supply, on / switch that the off-switching operation through the battery voltage, a first for supplying a driving voltage of the controller for the screen voltage of the voltage that is input from the switch constituting the electronic control means the constant voltage of the voltage that is input from the regulator and the switch screen can be obtained by the reduction of noise more effectively work environment, that in characterized in an electronic control unit configured to a second regulator for supplying a driving voltage of the controller of the ROM board Rom relates the board in the electronic control unit can independently develop and utilize to get the effect of shortening the time Romans board power supply.
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