Canon IR3300, IR2800 manual Controlling the Scanning Lamp LA2, Turning On/Off the Lamp, F02-302-01

CHAPTER 2 ORIGINAL EXPOSURE SYSTEM

3 Controlling the Scanning Lamp (LA2)

3.1 Outline

The system used to control the scanning lamp is constructed as follows and the items of control include the following:

[1]Turning on and off the scanning lamp.

[2]Monitoring the scanning lamp for errors.

Xenon lamp

LAMP1

Inverter PCB	J4021 J402 Reader controller
	1		5	+24V	PCB
Activation		LAMP_ON
control	3	INV_ERR	3	CPU
circuit	4		2
	2		4

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3.2 Scanning Lamp

The machine’s scanning lamp is a xenon lamp of a non-electrode discharge type, in which xenon gas is sealed in a tube.

On the outside of the glass tube, two electrodes are arranged parallel to the tube axis, and the inner side of the glass tube is coated with fluorescent material.

The internal gas discharges and, as a result, the fluorescent material glows when a high- frequency voltage is applied across the electrodes.

ElectrodeElectrode

Fluorescent Opening material

Glass tube

ElectrodeElectrode

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3.3 Turning On/Off the Lamp

The scanning lamp is turned on/off in response to the drive signal (LAMP_ON) from the CPU on the reader controller PCB. When the signal is generated, the inverter generates a high-frequency voltage using the drive voltage (+24 V) supplied by the reader controller PCB to turn on the xenon tube.

COPYRIGHT © 2001 CANON INC. CANON iR2200/iR2800/iR3300 REV.0 MAR. 2001 2-9 R