Electrophotographic Process; Electrophotographic Process Mechanism - OKIDATA OL600e Service Manual

2.4

Electrophotographic Process

2.4.1

Electrophotographic Process Mechanism

This mechanism uses the electrophotographic process to print image data supplied by the
control board.
The layout of the electrophotographic process mechanism is shown in Figure 2-6.
(1) Image Drum Unit
The image drum unit consists of a light-sensitive drum, a charger, and a developer. The
unit forms a toner image on the sensitive drum, using an electrostatic latent image formed
by the LED head.
(2) Registration Motor
The registration motor is a pulse motor of 48 steps/rotation, which is two-phase excited by
the signal 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 Motor
The drum motor is a pulse motor of 48 steps/rotation, which is two-phase excited by the
signal from the Main Control PCB and is the main motor of this mechanism.
(4) LED Head
Image data for each dot line from the control board is received by the shift register and latch
register. The 2560/2496 LEDs are driven to radiate the image data on the image drum.
(5) Fuser
The 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 the
HEATON signal from the control board. This AC voltage heats the heater. The Main
Control PCB monitors the heat roller temperature via the thermistor, and regulates the
heater roller to a predetermined temperature (165 degrees Celsius) by connecting or
disconnecting the AC voltage supply to the heater.
When the temperature of the heater roller rises abnormally, the thermostat of the heater
voltage supply circuit becomes active and cuts the AC voltage supply.
Operation Description 2 - 12
Service Manual, P/N 59271602
OL600e/610e/610e-PS/610e-S