An image forming apparatus, and a method of controlling it. The apparatus performs, in a case where at least one function out of a plurality of functions of the apparatus ceases to be usable, degeneracy control for operating to provide functions other than the at least one function, and stores information indicating a degeneracy control state is entered. The apparatus controls so as to activate without initialization operation of an image forming mechanism in a case where it is determined that the activation is due to the return from a power saving mode and the information is stored and so as to activate with the initialization operation when the activation is due to a power of the apparatus being turned on.

An electrical device includes a controlling unit configured to control the electrical device, a power supplying unit configured to supply power to the controlling unit, and a power controlling unit configured to control supply and interruption of power with regard to the controlling unit by the power supplying unit. In a case where the controlling unit receives a supply of power from the power supplying unit under control of the power controlling unit, the controlling unit executes different processing based on whether or not the supply of power is a first supply of power after power-on with regard to the power supplying unit.

A power control device includes a power supply, an integrated scanner assembly (ISA), an image forming engine including a general engine unit and a special engine unit, a main power switch, a special engine unit power switch, and a processor including an independent power controller, and the processor to control power supplied to the ISA and the general engine unit by closing the main power switch through the independent power controller, to receive specification information from the ISA activated by the supplied power, to receive state information on the image forming engine from the general engine unit activated by the supplied power, and to supply power to the special engine unit by closing the special engine unit power switch after receiving the specification information and the state information.

A control device includes a first control substrate including a processor and a communication interface; and a second control substrate including a processor and a communication interface. The first control substrate and the second control substrate are connected through the communication interfaces. When occurrence of an error in data communication through the communication interfaces is detected, at least one of the processor of the first control substrate and the processor of the second control substrate performs the data communication using unused signal lines among signal lines provided in the communication interfaces.

An electronic apparatus that communicates with an information processing apparatus that includes at least one memory storing a program and at least one processor, that when executes the program, causes the electronic apparatus to receive a job from the information processing apparatus, enable or disable a specific function causing the electronic apparatus to transition to a first state from a second state in response to receiving the job in the second state, the second state having lower power consumption than the first state, and perform, in a case where a power-on operation is performed on the electronic apparatus in a state where the specific function is disabled, control to display a screen prompting enabling of the specific function based on receiving a job satisfying a predetermined condition, and executing an operation based on the received job.