OKIDATA OF2600, Service Manual

Page: 41 / 410

Page: 34
Service Guide OF2200/2400/2600
Chapter 1 Principles of Operation
1.4 LED PRINTER
1.4.01 Principal Components
The principal hardware components of the printer unit are listed below.
· Printer Control Board
· Power Supply Unit
· Fuser Unit
· Main Motor
· LED Head
· Registration Motor
· DC Fan
· Second Paper Tray Mechanism (option)
1.4.02 Printer Control Board
The printer control board contains a printer unit gate array, 7.5 megahertz microprocessor, send motor
driver (transistor array), registration motor driver integrated circuit, drum motor driver integrated circuit,
and fan motor driver transistors.
This board controls the paper feed and paper transport functions. It also activates the LED array diodes,
which leave a latent electrostatic image on the photosensitive drum. This latent image is printed by fusing
toner to the paper.
1.4.03 Power Supply Unit
The power supply is a switching-type unit, which generates the following voltages from the AC input
voltage.
· + 5 vdc : Printer Logic
· + / - 12 vdc: Interface Signal Levels
· + 38 vdc: Transmit Stepper Motor, Registration / Drum Motor Drive,
Fan Drive, High-Voltage Source.
When the board enables the HEATON signal, the power supply provides the AC voltage to the fuser lamp.
1.4.04 Power Supply Board Components and Functions
The power supply consists of integrated circuit 1 (a one-chip CPU), a cover-open switch, the high,
medium, and low voltage generation circuits and photosensors.