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

iR5065 / iR 5055 / iR5075 / / /

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

iR5065 / iR 5055 / iR5075 / / /

- 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.

10.2 Counters

10.2.1 Soft Counters

iR5065 / iR 5055 / iR5075 / / /

The machine possesses soft counters used to keep track of the number of prints it has made. The counter readings are indicated in response to a press on the Check

key on the control panel.

The counters are controlled by the main controller PCB, and the readings are incremented in response to detection of paper by the following sensors at time of

copier/printer operation:

Copier/printer operation

Simplex mode

Duplex mode

Main controller PCB

Touch panel

Color LCD

Control panel control block

J1018A,J1018B

J511

J1114

Control panel CPU PCB