Original Exposure System

To learn about the principle how a original on the copyboard glass is read.  To learn about service persons’ tasks as well as configuration and operation of major units used for original exposure.

Learn about an overview of original exposure.

Overview of Original Exposure System

○Purpose: To learn about parts consisting of the original exposure system and their specs.

1. Overview

The original exposure system is a original reading area when a copy is made.

Original reading is performed by the reader unit [1]. The reader unit has the contact image sensor (CIS) [3], and the CIS shifts from side to side to read a original [4] on the copyboard glass [2] as image data. The image data read by the CIS is corrected by the reader controller, and is sent to the image-processing unit (main controller).

The auto document feeding function (ADF function) becomes available when the optional feeder unit is attached to the machine.

Original reading has the following 2 modes.

∙ BOOK mode: Reading a original on the copyboard glass

∙ ADF mode:    Feeding originals from the ADF to read (When the feeder unit is attached.)

 

Schematic diagram of the original exposure system is shown below (See photo: )

[1] Reader Unit

　

[2] Copyboard Glass

　

[3] Contact Image Sensor (CIS)

　

[4] Original

　

2. Specifications List of Original Exposure System

Specifications of the original exposure system are shown below.

Item		Function/Method
Original Exposure		Indirect exposure using the LED (LED + photoconducting body)
Original Scan	BOOK mode	The contact image sensor (CIS) moves to scan.
	ADF mode	The contact image sensor (CIS) is fixed to scan.(Original stream reading)
Resolution		600dpi x 600dpi
Gradation		256 steps
Scan Speed (When the ADF is attached)		45ipm (1-sided, A4/LTR)
Carriage position sensor		CIS home position sensor (PS503)
Scaling	Scaling	25%to400
	Main scan direction	Image processing by the main controller PCB
	Sub scan direction	BOOK mode: Change of the carriage moving speed, Image processing by the reader controller PCB, Image processing by the main controller PCB ADF mode: Change of the original feeding speed, Image processing by the reader controller PCB, Image processing by the main controller PCB
Lens		Rod lens array
CCD	Line	1 line
	Pixel	7488 pixels
	Max. document reading width	304mm
CIS Drive Control		Drive control by the reader motor (M501)
Original Size Detection	BOOK mode	Main scan direction: Reflection sensor (AB/INCH) Sub scan direction: Reflection sensor (AB/INCH)
	ADF mode	Width: The volume of original width on the ADF Length: The photo sensor on the ADF

Lean about the reader unit.

Reader Unit

　

○Purpose: To learn about controls executed by the reader unit.

　

　

1.Overview

The reader unit is controlled by the reader controller PCB.  When the reader controller receives a original reading command from the main controller, it controls the contact image sensor (CIS) to execute scanning.  At this time, the CIS shifts from side to side using the reader motor drive to scan original data for 1 page.

Original size on the copyboard glass is detected by the original sensors 1 to 5.

The reader unit consists of the following parts.

[1] Copyboard Cover Open/Close Sensor 1 (PS501)

[2] Reader Controller PCB

[3] Original Sensor 3 (PS506)

[4] Original Sensor 4 (PS507)

[5] Original Sensor 5 (PS508)

[6] Reader Motor (M501)

[7] Reader Heater (Option)

[8] Original Sensor 1 (PS504)

[9] Original Sensor 2 (PS505)

[10] Contact Image Sensor (CIS)

[11] CIS Home Position Sensor (PS503)

[12] Copyboard Cover Open/Close Sensor (PS502)

Reader Controller PCB

Jack No.	Description
J500	supplies power to the ADF.
J501	receives power from the machine body (printer unit).
J502	communication with the machine body (printer unit).
J503	communication with the ADF.
J504	communication with the ADF.
J505	connects to the main motor.
J506	copyboard cover open/closed sensor; connects to the CIS HP sensor
J507	connects to original sensor 1, original sensor 2.
J508	connects to original sensor 3, original sensor 4.
J510	connects to the contact image sensor (CIS).
J512	for use at factory
J513	for use at factory

The reader unit executes the following controls.

If you need detailed descriptions, click in the more information field.