Patent ID: 8126348

Claim:
A printing apparatus comprising: at least one device unit to perform a printing operation; a main controller to control the device unit; a main power supply to supply power to the main controller; an instruction receiving part to receive a user's printing instruction and to transmit the user's printing instruction to the main controller, the instruction receiving part being a USB (universal serial bus) controller to receive the user's printing instruction from a host apparatus according to a USB standard through a communication with the host apparatus; a power controller with a power consumption lower than the main controller to control the main power supply such that power is supplied to the main controller when the instruction receiving part receives the printing instruction while the printing apparatus is in a standby state wherein supply of power to the main controller is interrupted; an auxiliary power supply to supply power to the instruction receiving part and the power controller; a power switch to be switched on or off by a user manipulation; a switch state output part to output a switch state signal corresponding to a switch-on state or a switch-off state of the power switch; and wherein the power controller controls the main power supply such that the power is supplied to the main controller when it is determined, based on the switch state signal from the switch state output part, that the power switch is switched on while the printing apparatus is in the standby state.