| 摘要 |
PURPOSE:To save and reduce the power consumption, to improve the durability and to reduce noise by driving a motor to the indispensable minimum not always rotating the driving motor at the time when a power source is applied. CONSTITUTION:A driver substrate 65 controls the light projecting part and the light receiving part of a toner sensor, detects whether toner exists or not, and stores the detection result to a nonvolatile RAM. When the power source 66 of a laser printer is turned on, the value of the nonvolatile RAM storing a condition before the power source is turned off in the case of using the substrate at the previous time in terms of the existence/absence of the toner is read, and whether the condition is a toner-absence condition or not before the power source is turned off is decided. Since the existence/absence of the toner is not required to be detected if the condition is toner-existent, a main motor 73 is not driven by a software, and the control of printing operation is performed after starting the printing operation. When the condition is toner- absent in the case of using the substrate at the previous time, the motor 73 is driven by the software so as to detect the existence/absence of the toner. |
