Image forming apparatus and power supply control method

An output apparatus comprising:

• a main power supply;
• an auxiliary power supply that stores therein power from the main power supply, and supplies the stored power;
• a power supply control unit that performs control of switching a power supply source to the auxiliary power supply when the main power supply is off, and control of switching the power supply source to the main power supply when the main power supply is on;
• a detection unit that detects whether the power supply source is the main power supply or the auxiliary power supply;
• a mode control unit that performs control of switching between a normal mode and a power-saving mode in which power consumption is smaller than in the normal mode;
• and
• a maintenance unit that performs a maintenance on an output unit, wherein
• the mode control unit performs control of setting a switching time to switch from the normal mode to the power-saving mode to a shorter time when the detection unit detects that the power supply source is the auxiliary power supply,
• the maintenance unit halts an operation of the maintenance when the detection unit detects that the power supply source is the auxiliary power supply, and
• the maintenance unit performs the operation of the maintenance when the power supply source is switched from the auxiliary power supply to the main power supply.