Canon iR C6800 Series Service Manual page 736

Chapter 10
10.1.2 LCD Processing
The CPU on the main controller PCB sends data (display information) to the control panel CPU PCB according to
the instructions at such times as programmed.
The data goes through the control panel CPU PCB for display on the color LCD.
10.1.3 LCD Contrast Adjustment
The machine' s keypad PCB is equipped with a contrast adjustment volume (VR6801) to enable the user to adjust
the contrast of the LCD.
10.1.4 Control Panel CPU
Monitoring Key Inputs
communicates the inputs made on the keypad or function keys to the CPU on the main controller PCB.
Monitoring Touch Panel Inputs
communicates the inputs made on the touch panel to the CPU on the main controller PCB.
Controlling the Buzzer Sound
Controlling the Control Panel LED
Memo:
The color LCD is driven by the main controller, and the control panel CPU PCB serves to relay the drive signals.
10-2
0003-2956
0003-2957
0003-2958