Sharp AL-800 - Manual

Sharp AL-800

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Table of Contents:

  • Page 2 – OPERATING PRINCIPLE; POWER PWB
  • Page 3 – Fusing/paper exit section
  • Page 4 – Outline of operations; A. Paper path and imaging; ) Paper feed (Paper on the paper tray is fed to the transfer section; B. Image process and data flow
  • Page 5 – DATA FLOW DIAGRAM
  • Page 6 – Operations of each section; The paper feed tray contains about 200 (250) sheets of paper.
  • Page 8 – LSU PWB
  • Page 9 – Paper feed roller, paper feed solenoid; ON
  • Page 13 – Signal
  • Page 15 – D. Image process section
  • Page 17 – a. Photoconductor section
  • Page 18 – b. Development section
  • Page 21 – b. Major parts functions and operations; Toner seal; ) Photoconductor drum; The doctor is made of a conductive material.; ) Toner supply roller; During cleaning, a voltage of –850V is applied.
  • Page 22 – c. Actual image forming process; The main charger brush is of roller shape and is rotating.; Step 2 (Exposure) Laser beam scanning light corresponding to the; print data is radiated onto the OPC drum.
  • Page 23 – Step 3 (Development): Toner is attached to the latent electrostatic; images formed on the OPC drum.; Step 4 (Transfer): Visible images of toner on the OPC drum are; transferred to the paper.; OPC drum
  • Page 25 – d. OPC drum surface potential; <1> OPC drum surface potential shift in printing
  • Page 27 – The heater lamp is lighted by the AC power source.; POWER SUPPLY PWB
  • Page 29 – G. Electrical section; a. Major sections operations and functions
  • Page 30 – ICU PWB
  • Page 31 – COPYRIGHT; No part of this publication may be reproduced,; 998 October Printed in Japan
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SERVICE MANUAL

CODE: 00ZAL840//B1E

BASIC MANUAL

DIGITAL COPIER

MODEL

AL-800/840

SHARP CORPORATION

This document has been published to be used
for after sales service only.
The contents are subject to change without notice.

Parts marked with "

!

" is important for maintaining the safety of the set. Be sure to replace these parts with specified

ones for maintaining the safety and performance of the set.

[ 1 ] OPERATING PRINCIPLE

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

1. Block diagram

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1

2. Outline of operations

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

A. Paper path and imaging . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

B. Image process and data flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3

3. Operations of each section

. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

A. Paper feed, paper transport section . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5

B. Scanner (reading) section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-9

C. Scanner (writing) section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-12

D. Image process section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-14

E. Fusing/paper exit section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-25

F.

Drive section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-27

G. Electrical section . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-28

CONTENTS

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Summary

Page 2 - OPERATING PRINCIPLE; POWER PWB

[1 ] OPERATING PRINCIPLE 1. Block diagram CCD CPU ASIC MEMORY MEMORY ICU PWB ASIC HOST(PC) KEY AC POWER Control signal, detection signal, drive signal, control data line Image data signal line Image (light) Power line Paper path line OPERATION PWB LAMP (LED) MAIN MOTOR PRINT PWB SCANNER HOME POSITIO...

Page 3 - Fusing/paper exit section

Scanner (read) section In this section, the copy lamp (cathode ray tube, Xenon lamp)radiates light onto a document, and the reflected light is detected bythe image sensor (CCD element) to convert into electrical signals(analog signals), which are sent to the MCU PWB. MCU (ICU) PWB The image data fro...

Page 4 - Outline of operations; A. Paper path and imaging; ) Paper feed (Paper on the paper tray is fed to the transfer section; B. Image process and data flow

2. Outline of operations A. Paper path and imaging Paper is fed, transported, and discharged through the path indicatedwith the arrow in the figure below. 1) Paper feed (Paper on the paper tray is fed to the transfer section by the paper feed roller.) 2) Image transfer (The toner image on the photoc...

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