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Service Guide ML590/ML591
Chapter 2 Principles of Operation
2.1.02 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 power supply assembly through a wire
harness. The power to other electrical parts, such as the line feed motor, space motor and
printhead, is supplied by the power supply assembly through the connectors on the main control
board.
Microprocessor (MPU)
Location 04D: 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 space and 1 Mbyte of data
memory space.
The microprocessor controls the entire printer by executing the control program
through the LSI and the driver circuit.
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