Abstract: A signal processing board includes a six-layer substrate in which six wiring layers are stacked, and a first semiconductor element and a second semiconductor element mounted on the outer surface of a first layer of the six wiring layers. A plurality of signal transmission patterns are formed in the first layer, a third layer, a fourth layer, and a sixth layer of the six wiring layers. A first ground pattern is formed in a second layer. A second ground pattern is formed in a fifth layer. A first power supply pattern is formed in one of the fourth layer, the fifth layer, and the sixth layer. A second power supply pattern is formed in one of the fourth layer, the fifth layer, and the sixth layer.

Abstract: A signal processing board includes a six-layer substrate in which six wiring layers are stacked, and a first semiconductor element and a second semiconductor element mounted on the outer surface of a first layer of the six wiring layers. A plurality of signal transmission patterns are formed in the first layer, a third layer, a fourth layer, and a sixth layer of the six wiring layers. A first ground pattern is formed in a second layer. A second ground pattern is formed in a fifth layer. A first power supply pattern is formed in one of the fourth layer, the fifth layer, and the sixth layer. A second power supply pattern is formed in one of the fourth layer, the fifth layer, and the sixth layer.

Abstract: An image forming apparatus includes a function control processing unit, a clock oscillation unit, power supply control unit including a power supply control processing unit which starts as a power supply of the image forming apparatus is turned on to control energization of constituent elements and control a startup operation of the function control processing unit. Further, the image forming apparatus has a warming-up operation mode in which when the power supply of the image forming apparatus is turned on, the power supply control processing unit starts up to make the clock oscillation unit start operating to transmit a clock signal to the function control processing unit, and in which the power supply control processing unit restarts itself and starts up the function control processing unit after a lapse of a predetermined standby time set beforehand, with the function control processing unit kept inactive.

Abstract: An image forming apparatus includes a function control processing unit, a clock oscillation unit, power supply control unit including a power supply control processing unit which starts as a power supply of the image forming apparatus is turned on to control energization of constituent elements and control a startup operation of the function control processing unit. Further, the image forming apparatus has a warming-up operation mode in which when the power supply of the image forming apparatus is turned on, the power supply control processing unit starts up to make the clock oscillation unit start operating to transmit a clock signal to the function control processing unit, and in which the power supply control processing unit restarts itself and starts up the function control processing unit after a lapse of a predetermined standby time set beforehand, with the function control processing unit kept inactive.