Copyright 1998 by Sharp Corporation | Sharp Digital Copier, AL-840

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COPYRIGHT © 1998 BY SHARP CORPORATION

All rights reserved.

Printed in Japan.

No part of this publication may be reproduced, stored in a retrieval system, or transmitted.

In any form or by any means,

electronic, mechanical, photocopying, recording, or otherwise,

without prior written permission of the publisher.

SHARP CORPORATION

Printing Reprographic Systems Group

Quality & Reliability Control Center

Yamatokoriyama, Nara 639-1186, Japan

1998 October Printed in Japan S

Image 31

Sharp Digital Copier, AL-840, AL-800 service manual Copyright 1998 by Sharp Corporation

Contents

Model AL-800/840 Operating Principle Scanner read section Fusing/paper exit sectionHigh voltage power PWB Power PWB Paper path and imaging Copy modeImage process and data flow Printer mode Data Flow Diagram PUS Paper feed, paper transport sectionOutline Major parts Paper Size PE Sensor PempPUS PIN Sensor Operation Paper release operation Scanner reading section Sensor MhpsCCD CCD OUT CCD Asic IC8 Mcupcu PWB Wiring diagram Scanner writing section Block diagram Mcupcu PWB LSU PWB SyncICU PWB Image process section Image forming process diagram OPC Photoconductor section Development section Transfer/separation section CPU IC5 System diagram Separation electrode Photoconductor drum unitDeveloping unit Transfer charger roller Actual image forming process Paper Transfer roller Residual toner OPC drum OPC drum surface potential OPC drum surface potential and developing bias Model Fusing/paper exit sectionRTH AMP CN2 AC PowerHlon HLL Comp CPU IC5 MEN MMT0 MMT1 Wiring diagramDrive section Asic Major sections operations and functions Electrical section Power PWB High voltage power PWBCopy lamp control PWB Operation PWB Copyright 1998 by Sharp Corporation