Adjustment Of The Lcd Contact; Functions Of The Control Panel Cpu - Canon iR4570 Series Service Manual

Chapter 10

10.1.3 Adjustment of the LCD Contact

iR2270 / iR2870 / iR3570 / iR4570
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

iR2270 / iR2870 / iR3570 / iR4570
- 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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