Lcd Indication Processing; Adjustment Of The Lcd Contact; Functions Of The Control Panel Cpu - Canon imageRUNNER 2270 Service Manual

Chapter 10

10.1.2 LCD Indication Processing

The CPU on the main controlled PCB sends data (display data) to the control panel CPU
PCB as instructed by the program.
The data is sent through the control panel PCB to reach the color LCD.

10.1.3 Adjustment of the LCD Contact

The machine is equipped with a density adjustment volume (VR6801) on its keypad PCB
for use by the user to adjust the contrast of the LCD screen.

10.1.4 Functions of the Control Panel CPU

- Monitoring the Key Inputs
It communicates the keypad and function key inputs to the CPU on the main controller
PCB.
- Monitoring the Touch Panel Input
It communicates the key 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.
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