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Service Guide OL830
Chapter 2 Principles of Operation
2.3.09 Operation Panel
The 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 sheet
LEDs (for Online Mode indication)
Operation Buttons
The Operation Panel is connected to the Main Controller Board via the Engine Connection Board
and the Engine Controller Board.
The LCD control driver (MSM622B or HD44780) converts 4-bit character codes received from the
MPU into 8-bit character codes and retrieves the character pattern data (font) from the internal
character generator for display on the LCD.
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