Toshiba e-STUDIO453 User Manual

e-STUDIO350/352/353/450/452/453
SCANNER
6
6 - 11 © 2003 - 2008 TOSHIBA TEC CORPORATION All rights reserved
I = k x (S — K)
(W — K)
 k : Coefcient
S : Image data before correction
K : Black data (stored in “black” memory)
W : White data (stored in “white” memory)
6.5 General Description of CCD Control
6.5.1 Opto-electronic conversion
ACCD(charge-coupleddevice)isusedtoproduceelectricalsignalcorrespondingtothereectedlight
amount from the original. CCD is a one-chip opto-electronic conversion device, comprised of several
thousand light-receiving elements arranged in a line, each one of them is a few micron square.
This equipment is equipped with a CCD which has 7,400 light-receiving elements.
Each element of the light-receiving section consists of semiconductive layers P and N. When the light
irradiates the element, light energy produces a (-) charge in the layer P; the amount of the charge pro-
duced is proportional to the energy and irradiating time. The charges produced in the light-receiving
section are then sent to the transfer section where they are shifted by transfer clock from left to right
asshowninthegurebelow,andarenallyoutputfromtheCCD.Atthistime,toincreasethetransfer
speed of the CCD, image signals in the even-number and odd-number elements are separated and
output in parallel via two channels.
6.5.2 Shading correction
Signal voltages read by the CCD have the following characteristics:
(1) Light source has a variation in its light distribution.
(2)Sincethelightbeamreectedfromtheoriginalisconvergedusingalens,thelightpathis
the shortest at the center of the CCD and the longest at ends. This causes difference in the
amount of light reaching the CCD (i.e. the light amount is maximum at the CCD center, gradu
-
ally decreases toward ends).
(3)Eachofthe7,400elementsvariesinopto-electronicconversionefciency.
These variation need to be corrected and this correction is referred to as shading correction. Shading
correction is performed by applying normalization process using the following formula on the black and
white data obtained in advance to correct lighting variance and element variation of the image data.
1
7397
7398 7399 7400
2
3 4
Transfer clock
Transfer section
Transfer section
Light receiving section
Light energy
Iayer N
Iayer P
Transfer clock
Shift register
Details of light receiving
Fig. 6-501

Toshiba e-STUDIO453 Specifications

General

Brand	Toshiba
Model	e-STUDIO453
Category	All in One Printer
Language	English

Summary

General Precautions for Installation and Service

1. Transportation / Installation

Guidelines for safely moving and setting up the equipment.

2. Service of Machines

Precautions and safety measures to take when servicing the machine.

Safety and Handling Precautions

3. Main Service Parts for Safety

Highlights critical components for safe operation and maintenance.

4. Cautionary Labels

Information regarding important safety labels on the equipment.

5. Disposition of Consumable Parts and Materials

Guidance on proper disposal of materials according to regulations.

8. Precautions Against Static Electricity

Procedures to prevent damage to electronic components from static discharge.

1. Specifications, Accessories, Options, and Supplies

1.1 Specifications

Details on the technical features and capabilities of the equipment.

1.2 Accessories

Lists the items included with the equipment.

1.3 Options

Lists optional components and add-ons for the equipment.

1.4 Supplies

Information on consumable items like toner and developer.

2. Outline of the Machine

2.1 Sectional View

Explains the internal structure of the machine with diagrams.

2.2 Electric Parts Layout

Illustrates the arrangement of electrical components within the machine.

2.3 Symbols and Functions of Various Components

Details the purpose and symbols of different parts within the machine.

2.5 Installation and Replacement of Covers and PC boards

Instructions for removing and installing external covers and circuit boards.

3. Copy Process

3.1 General Description of Copying Process

Outlines the step-by-step process of how copying is performed.

3.2 Details of Copying Process

Provides in-depth explanations of each stage in the copying process.

4. General Operation

4.1 Overview of Operation

General guide to operating the equipment.

4.2 Description of Operation

Detailed explanation of how to perform various operations.

4.3 Detection of Abnormality

Information on how the machine detects and reports errors.

5. Control Panel

5.1 Control Panel and Display Panel

Description of the control panel layout and its display elements.

5.2 Items Shown on the Display Panel

Explains the various information displayed on the equipment's screen.

5.4 Description of Operation

Detailed explanation of how the equipment operates.

6. Scanner

6.1 Function

Explains the purpose and basic operation of the scanner.

6.2 Construction

Details the physical components and structure of the scanner.

6.3 Description of Operation

Explains how the scanner functions during operation.

6.7 Disassembly and Replacement

Instructions for removing and installing scanner components.

7. Image Processing

7.1 General Description

Overview of the image processing stages.

7.3 SLG Board

Details the functions and features of the SLG board.

7.4 LGC Board

Details the functions and features of the LGC board.

7.5 Laser Driving PC Board (LDR board)

Explains the function of the LDR board in laser control.

8. Laser Optical Unit

8.1 General Description

Overview of the laser optical system.

8.2 Structure

Describes the physical construction of the laser optical unit.

8.3 Laser Diode

Details the laser diode, its specifications, and control.

8.5 Polygonal Motor

Explains the polygonal motor's drive circuit and control signals.

9. Paper Feeding System

9.1 Functions

Describes the purpose and main components of the paper feeding system.

9.2 Operation

Explains how the paper feeding system operates.

9.4 Disassembly and Replacement

Instructions for disassembling and replacing components in the paper feeding system.

10. Drive System

10.1 General Description

Overview of the machine's drive system and main motor.

10.3 Main Motor

Details the main motor's drive and control signals.

10.4 Disassembly and Replacement

Instructions for removing and replacing drive system components.

11. Drum Related Section

11.1 Configuration

Outlines the components around the drum and their arrangement.

11.2 Functions

Explains the roles of the drum and related components.

11.3 Output Control Circuits of High-Voltage Transformer

Details the circuits controlling high voltage outputs for chargers and bias.

11.6 Disassembly and Replacement

Instructions for removing and replacing drum-related parts.

12. Development System

12.1 Configuration

Describes the components of the development system.

12.2 Functions

Explains the functions of the toner cartridge and developer unit.

12.4 Auto-Toner Circuit

Explains the circuit that manages toner density and supply.

12.5 Disassembly and Replacement

Instructions for disassembling and replacing developer system components.

13. Fuser Unit / Paper Exit Section

13.1 General Description

Overview of the fuser unit and its role in fusing toner.

13.2 Operation

Explains how the fuser unit operates to fuse toner onto paper.

13.3 Functions

Details the functions of the IH coil, rollers, and thermistors.

13.4 Heater Control Circuit

Describes the circuit that controls the heating elements.

13.7 Disassembly and Replacement

Instructions for disassembling and replacing fuser unit components.

14. Automatic Duplexing Unit (ADU)

14.1 General Description

Overview of the ADU's function in duplex printing.

14.2 Description of Operations

Explains the operational procedures for duplex printing.

14.5 Disassembly and Replacement

Instructions for disassembling and replacing ADU components.

15. Power Supply Unit

15.1 Construction

Describes the construction of the power supply unit, including AC filter and DC outputs.

15.2 Operation of DC Output Circuits

Explains the sequence of power supply output during startup and shutdown.

15.4 Fuse

Information on fuses and troubleshooting related to blown fuses.

15.6 Sequence of Power Supply

Timing chart illustrating the power supply sequence.

16. PC Boards

16.1 PWA-F-SYS

Diagram and identification of the main system PC board.

16.2 PWA-F-LGC

Diagram and identification of the LGC PC board.

16.3 PWA-F-SLG

Diagram and identification of the SLG PC board.

16.4 PWA-F-CCD

Diagram and identification of the CCD PC board.

16.5 PWA-F-LRL

Diagram and identification of the LRL PC board.

16.6 PWA-F-LDR

Diagram and identification of the LDR PC board.

16.7 PWA-F-SNS

Diagram and identification of the SNS PC board.

16.8 PWA-F-ADU

Diagram and identification of the ADU PC board.

16.9 PWA-F-DSP

Diagram and identification of the DSP PC board.

16.10 PWA-F-KEY

Diagram and identification of the KEY PC board.

16.11 PWA-F-FIL

Diagram and identification of the FIL PC board.

16.12 PWA-F-FUS

Diagram and identification of the FUS PC board.