Page: 19Service Guide OL400Chapter 2 Principles of Operation2.3.02 Operation PanelThe following components make up the operation panel.4-bit MPU (LC6543C)LCD control driver (MSM6222B or HD44780)LCD display (16 characters per line)Operation panel sheetLEDs (for online mode indication)Operation buttonsThe LCD control driver (MSM622B or HD44780) converts 4-bit character codes received from theMPU into 8-bit character codes and retrieves the character pattern data (font) associated with the8-bit character codes from the internal character generator for display on the LCD.Operation Panel InterfaceThe operation panel is controlled by the operation panel interface located on the Main ControlBoard via the Engine Board.Copyright 1997, Okidata, Division of OKI America, Inc. All rights reserved. See the OKIDATA BusinessPartner Exchange (BPX) for any updates to this material. (http://bpx.okidata.com)
