Acer Extensa 390 Service Guide

390 Series 390 Series
Notebook Computer Notebook Computer
Service GuidePART NO.:  49.43A02.001
DOC. NO.:   SG234-9710APRINTED IN TAIWAN 

iiCopyright Copyright
Copyright  ã  1997 by Acer Incorporated.  All rights reserved.  No part of this publication may be
reproduced, transmitted, transcribed, stored in a retrieval system, or translated into any language
or computer language, in any form or by any means, electronic, mechanical, magnetic, optical,
chemical, manual or otherwise, without the prior written permission of Acer Incorporated.
Disclaimer Disclaimer
Acer Incorporated makes no representations or warranties, either expressed or...

iiiAbout this Manual About this Manual
Purpose
This service guide aims to furnish technical information to the service engineers and advanced
users when upgrading, configuring, or repairing the 390 series notebook computer.
Manual Structure
This service guide contains technical information about the 390 series notebook computer.  It
consists of three chapters and five appendices.
Chapter  1System Introduction
This chapter describes the system features and major components.  It contains the 390
series...

ivAppendix  DSchematics
This appendix contains the schematic diagrams for the system board.
Appendix  EBIOS POST Checkpoints
This appendix lists and describes the BIOS POST checkpoints.
Conventions
The following are the conventions used in this manual:
Text entered by userRepresents text input by the user.
Screen messagesDenotes actual messages that appear onscreen., , , etc.Represent the actual keys that you have to press on the
keyboard.NOTE
Gives bits and pieces of additional information related to...

vTable of Contents Table of Contents
Chapter  1System Introduction
1.1Overview.............................................................................................................1-1
1.2System Board Layout...........................................................................................1-2
1.2.1Mainboard.............................................................................................1-2
1.2.2CPU...

vi1.4.24LCD.....................................................................................................1-21
1.4.25AC Adapter..........................................................................................1-22
1.5Software Configuration and Specification............................................................1-23
1.5.1BIOS....................................................................................................1-23
1.5.2Drivers, Applications and...

vii2.5.3Pin Configuration.................................................................................2-78
2.5.4Pin Descriptions...................................................................................2-79
2.6YMF715B-S........................................................................................................2-81
2.6.1Features...............................................................................................2-81
2.6.2Pin...

viiiAppendices
Appendix  AModel Number Definition
Appendix  BExploded View Diagram
Appendix  CSpare Parts List
Appendix  DSchematics
Appendix  EBIOS POST Checkpoints 

ixList  of  Figures
1-1PCB No. 96183-1A Mainboard Layout (Top)........................................................1-2
1-2PCB No. 96183-1A Mainboard Layout (Bottom)...................................................1-3
1-3PCB No. 96534-SE CPU Board Layout (Top).......................................................1-4
1-4PCB No. 96534-SE CPU Board Layout (Bottom)..................................................1-4
1-5PCB No. 97355-1 Audio...

x4-11Removing the LED Cover...................................................................................4-12
4-12Removing the Heat Sink Assembly.....................................................................4-12
4-13Unplugging the Display Cable.............................................................................4-13
4-14Removing the Display Hinge Screws..................................................................4-13
4-15Removing the Display Hinge...