Control Panel; Overview; Lcd Indication Processing; Adjusting The Lcd Contrast - Canon iR6570 series Service Manual

10.1 Control Panel

10.1.1 Overview

The machine's control panel consists of the following PCBs, LCD, and touch panel, and possesses the following principal functions:
- LCD indication
- contrast adjustment
- touch switch input
- hard key input

10.1.2 LCD Indication Processing

The CPU found on the main controller PCB serves to feed data (display data) to the control panel CPU on the control panel according to program
instructions.
The data goes through the control panel CPU PCB to reach the color LCD.

10.1.3 Adjusting the LCD Contrast

The machine is equipped with a density control volume (VR6801) on its keypad PCB so that the user can adjust the contrast of the LCD to suit individual
needs.

10.1.4 Functions of the Control Panel CPU

- Monitoring Key Inputs
It communicates the inputs from the keypads and function keys to the CPU on the main control PCB.
- Monitoring the Touch Panel Inputs
It communicates the inputs from the touch panel to the CPU on the main controller PCB.
- Controlling the Buzzer Sound
- Turning On Control Panel LEDs
MEMO:
The color LCD is operated by the main controller, and the control panel CPU PCB serves to relay the drive signal.
Main controller PCB
Touch panel
LCD
Control panel control block
J1018A,J1018B
J511
J1114
Control panel CPU PCB
J1112
J1113 J1110,J1111
J1 J6801,J6802
Control panel
Keypad PCB
inverter PCB
Control panel
F-10-1
Chapter 10
0009-2470
0009-2471
0009-2472
0009-2473
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