2 - 12(1) Image Drum UnitThe image drum unit consists of a sensitive drum, a charger, and a developer. The unit formsa toner image on the sensitive drum, using a electrostatic latent image formed by the LEDhead.(2) Registration MotorThe registration motor is a pulse motor of 48 steps/rotation, that is two-phase excited by thesignal from the Main Control PCB. It drives the hopping and registration rollers via two one-way clutches according to the direction of rotation.(3) Drum MotorThe drum motor is a pulse motor of 48 steps/rotation that is two-phase excited by the signalfrom the Main Control PCB and is the main motor of this mechanism.(4) LED HeadImage data for each dot line from the control board is received by the shift register and latchregister. The 2496 LED's (OKIPAGE 6e)/4992 LED's (OKIPAGE 6ex) are driven to radiatethe image data on the image drum.(5) FuserThe fuser consists of a heater, a heat roller, a thermistor and a thermostat.The AC voltage from the power supply board is applied to the heater controlled by theHEATON signal from the control board. This AC voltage heats the heater. The Main ControlPCB monitors the heat roller temperature via the thermistor, and regulates the heater rollerto a predetermined temperature (165°C) by connecting or disconnecting the AC voltagesupply to the heater.When an abnormal rise of the heater roller temperature takes place, the thermostat of theheater voltage supply circuit becomes active and forcibly cuts the AC voltage supply.
