Operation - Canon GP335 Service Manual

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CHAPTER 10 EXTERNALS/AUXILIARY MECHANISMS

B. Operation

1. Data Communication

The exchange of data is controlled by the IP-CPU (CPU for the image processor PCB).

2. LCD Processing

The IP-PCU sends data (display data) to the control panel CPU PCB as instructed by a

program. The control PCU PCB, on its part, relays the data to the LCD panel.

3. LCD Contrast Adjustment

The machine is equipped with a dial (on the control panel) to enable the user to adjust the LCD

contrast. The user may turn the dial to obtain LCD contrast of his/her choice.

4. Control Panel CPU

Monitors key inputs for transmission to the IP-CPU. (keypad keys, function keys)

Controls the buzzer sound.

Turns on/off the control panel LCD.

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