The machine's scanning lamp is a xenon lamp, which uses xenon gas sealed inside. On the outside of the glass tube, 2 electrodes are arranged in parallel with the

tube; the inside of the tube, on the other hand, is coated with fluorescent material. When a high-frequency high voltage is applied to the electrodes, the gas inside

the tube starts to discharge, causing the fluorescent material to emit light.

6.3.3.3 Turning On and Off the Scanning Lamp

/ / / / iR C4580i / / / iR C4080i / / /

The scanning lamp is turned on and off by the drive signal (LAMP_ON) generated by the CPU of the reader control PCB. When the signal is generated, the inverter

PCB generates high-frequency high voltage in the activation control circuit using the drive voltage (+24 V) supplied by the reader controller PCB to turn on the

xenon lamp.

ä÷òAÉGÉâÅ[ÉRÅ[ÉhÅF

Relevant Error Code:

E220 (Lamp ON fault when the power is ON.)

Inverter PCB fault, reader controller PCB fault, or scanning lamp fault.

6.3.4 Detecting the Size of Originals

6.3.4.1 Identifying the Size of Originals

/ / / / iR C4580i / / / iR C4080i / / /

The machine identifies the size of an original based on combinations of measurements taken of the light reflected by specific points (using a reflection type sensor

and CCD). In consideration of possible displacement of the original when the ADF is closed, the machine uses a 2-point CCD check.

- Main Scanning Direction:

by CCD (AB-configuration; 8-point measurement; inch-configuration, 6-point measurement)

- Sub Scanning Direction:

reflection type photo sensor (AB-configuration: 1-point measurement; inch-configuration: 1-point measurement)

Specifically, the following takes place:

1) External Light Search (main scanning direction only)

While keeping the scanning lamp off, the machine measures the level of the CCD at specific points in main scanning direction.

2) Sensor Output Level Detection

The machine turns on the scanning lamp, and measures the sensor output at specific points. It then checks combinations of these measurement to find the size

of the original.

6.3.4.2 Points of Measurement Used for Original Size Identification

/ / / / iR C4580i / / / iR C4080i / / /

For main scanning direction, the machine moves the No. 1 mirror base to the following points in relation to the location of the original to measure the levels of the

CCD. For sub scanning direction, the machine checks the states of the sensors arranged as follows:

AB-Configuration

CCD original detection position

To raise the accuracy of original size identification (as when the original is displaced while the ADF is closed), the machine makes use of the following 2 types of

mechanisms:

1. Presence/Absence of an Original at 2 Points (for each point of measurement)

For each point of measurement in main scanning direction, the machine checks the presence/absence of an original with reference to the CCD output at 2 points

near the point of measurement.

6-8

electode

Original

sensor 1

Point of original

detection 1

B5R

Print of original

A4R

detection 2

Point of original