OKIDATA OL400e Series, Service Manual

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Service Manual for OL400e/OL410e/OL410e-PS
Chapter 2 Principles of Operation
Print Operation
Both the control function (data reception and bit-image data generation) and the print
engine function (LED head, registration motor, and drum motor) are integrated. Both
functions are controlled by the main controller board. The peripheral logic is integrated
into one chip, an ASIC microcomputer (RISC-based microprocessor) chip.
Data is received through either the Centronics parallel interface or the RS232 serial interface.
These two interfaces are located on the main control board.
The LocalTalk interface is located on the PostScript Board.
The data is then stored in the receive buffer. The data is transferred from the receive buffer
to a processing section of the main controller. In this processing section, control codes and
printing codes are assigned. Once the font is determined, the data is written to the page buffer.
The microprocessor then executes the print routine. The data is extracted from the page buffer,
synchronized to the printing operation, and written to the band buffer. While performing the
engine functions, the microprocessor sends the data from the band buffer to the LED array
head.
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