Sharp ER-A520, ER-A530 service manual Copyright  2004 by Sharp Corporation

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COPYRIGHT 2004 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

Digital Document Systems Group

Products Quality Assurance Department

Yamatokoriyama, Nara 639-1186, Japan

2004 March Printed in Japan t

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Contents ER-A520 Model ER-A530 Appearance SpecificationsRating KeyboardSlip CancelDEPT# CONV2 ~ CONV4Mode Switch and Mode Keys Mode SwitchPrinter DisplayOptions 1.OPTIONS DrawerMaster Reset Master Reset and Program ResetProgram Reset Master ResetBlock Diagram Memory MAP Hardware DescriptionAddress MAP CPU PIN Table RTS4# Drive Signal RTS3# Drive SignalAN0 Temperature Monitor AN6 Power CON TrolStepping Motor Control Printer ControlHead Control Other PortsD Conversion KEY/DISPLAY Printer Head Temperature MonitorPrinter Head Voltage Monitor Reference VoltageKEY/DISPLAY Scan Flash Memory Rewrite Procedure PowerSerial I/O DisplayReset Ristrictions on Print RatioBuzzer Test Items Diagnostic ProgramDescription of Each Diag Program Display Buzzer TestPrinter Test Mode Switch TestKeyboard Test Printer Sensor TestDrawer 1 Open & Sensor Test Clock TestDrawer 2 Open & Sensor Test LCD CG TestOption RAM Test Standard RAM TestAD Conversion Port Test CPU Internal RAM Test16POLE Display Test Flash ROM TestRS Test 19SCANNER TestIPL from EP-ROM ROM Copy GND VCCIPL ROM CPU Circuit Diagram and PWB Layout16M Flash ROM Sram / from / Eprom / PoffLCD I/F / KEY I/F Printer Driver RS232C Driver / UP-P16DP CN DRAWER1 Option RAM Connector / Printer Connector / Drawer+5V, Vled ER-A520U/ER-A530U Circuit Diagram and PWB Layout ER-A520U/ER-A530U Circuit Diagram and PWB Layout ER-A520U/ER-A530U Circuit Diagram and PWB Layout Sharp Corporation Copyright  2004 by Sharp Corporation