Patent ID: 9086679
Filing Date: 2015-07-21
Classification: G03G

Abstract:
1. An image forming apparatus comprising: a consumable unit with a built-in memory; a power supply unit electrically connected to the consumable unit to provide power to the built-in memory; a memory control unit to determine whether an event that needs to access the built-in memory happens; a power control unit to control the power supply unit to provide power to the built-in memory when the event happens; a cover movably attached to a main body of the image forming apparatus, through which the consumable unit is detachable from the main body; a determination unit to determine whether the cover is opened or closed; an outputting unit to output an error message, when the cover is determined to be opened while power is being provided to the built-in memory; and an I/O control unit to perform at least one operation of data reading and data writing on the built-in memory under the control of the memory control unit, when the cover is determined to be closed while power is being provided to the built-in memory, wherein the consumable unit includes a CRUM unit (Customer Replaceable Unit Monitoring unit) comprising a CPU (Central Processing Unit) with the built-in memory; and the power control unit controls the power supply unit to provide power to the CRUM unit when the event happens, transmits a clock signal and data to the CRUM unit after a preset first delay time has passed, when a process in respect to the CRUM unit has finished, stops transmitting the clock signal and the data, and controls the power supply unit to cut off the power from the CRUM unit after a preset second delay time passes.