Main Control Board - Oki Microline 520 Service Handbook

2.1.01

Main Control Board

The main control board is made up of the microprocessor, peripheral circuits, drive circuits,
sensors and interface connectors.
The power to the main control board is supplied by the transformer assembly through a wire
harness. The power to other electrical parts (line feed motor, space motor and printhead)
is provided by the power supply circuitry through connectors on the main control board.
Microprocessor (MPU) (Location 04C: 67X640)
16 bit MPU, using CMOS technology.
The MPU contains a 20 bit address bus, a 16 bit data bus.
The MPU can access 1 Mbyte of program memory and 1 Mbyte of data memory
space.
The microprocessor controls the entire printer by executing the control program
through the LSIs and the driver circuits.
Principles of Operation 2 - 2 Microline 520/521 Service Handbook
P/N 59257803