Acer Extensa 670 Service Guide

4-22Theory of Operation A simplified block diagram of the Super I/O controller is provided in Figure 4-13.Configuration
RegistersUART
(16550 or 16450)UART
+ IrDA/HP & Sharp IR
(16550 or 16450)
General
Purpose
RegistersPower
Down LogicIEEEE1284
Parallel Port
Hifh Current Driver
Floppy Disk
Controller with
Digital Data
Separator
(Enhabced 8477)I/O PortsControl
InterruptDataHandshakeFloppy
Drive
Interface
OSCInterrupt
and
DMAFloppy
Drive
Interface InterruptIR
Interface Serial
Interface Interrupt Serial...

Service Guide4-23 4.3.9 ESS1878 Audio Controller with Interface to Expansion Audio Mixer
The ES1878 is a member of the ESS family of audio controllers that includes the ES1868. It shares
most of the features of the ES1868. and includes new features, such as support for the expansion
audio mixer chip, the ES978, and a new IIS serial port and stereo D/A converter. A 4-wire expansion
analog bus and 2-wire serial control bus connect the ES1878 and the ES978
Features
· Hot-dock interface to expansion audio...

C h a p t e r     5 C h a p t e r     5
Troubleshooting ProceduresService Guide5-1 5.1. Introduction
This chapter provides an overview of the fault isolation process, provides guidelines for isolating 67x
Series computer malfunctions to replaceable subassemblies and provides instructions for executing
diagnostics and interpreting error messages.
5.2. Overview of Fault Isolation Process
The fault isolation process  (summarized in Figure 5-1) consists of the following steps:
· Notebook power system...

5-2Troubleshooting Procedures 5.3. Troubleshooting Procedures
The built-in self test program and the disk resident diagnostics program (PC-Doctor) are useful tools
in computer troubleshooting. However, if the computer has a power, keyboard or display problem,
you must first solve this problem before running diagnostics. If the computer powers up and displays
messages on the LCD or emits a series of beeps, skip to Paragraph 5.3.3 for further instructions.
5.3.1 Troubleshooting a Power Supply Problem
If...

Service Guide5-3 Table 5-1Display Troubleshooting Guide
Problem DescriptionInverter
BoardLCD
PanelDisplay
CableMother
BoardBIOSSingle line on LCD display (horizontal or
vertical)LowHighMediumLowLowMultiple lines on display (horizontal or vertical)LowMediumMediumLowLowSections of the display are missing charactersLowMediumMediumLowLowScrambled DisplayLowMediumLowMediumMediumIntermittent characters on displayLowMediumMediumMediumLowBright display, no visible charactersLowMediumMediumMediumLowBrightness...

5-4Troubleshooting Procedures Table 5-2Self Test Error Messages
Error MessageExplanationDiskette read failure -
strike F1 to try to retry
bootThis message indicates the disk is defective or not formatted.
Try another known good formatted disk and press F1. Fixed disk failure
This message indicates the system disk drive failed to complete the self test or that
the nonvolatile random-access memory (NVRAM) is configured incorrectly for the
installed drive type.
Ensure that the notebook is configured to boot...

Service Guide5-5 Table 5-2Self Test Error Messages
Error MessageExplanationPress F1 to continue
This message tells you that an error was found during self test execution. Press F1
to attempt to reboot the computer.Save-to-Disk file is too
smallThis message occurs when you add memory. Use the MS-DOS program PHDISK
to increase the size of the save-to-disk file.Save-to-disk file is
missingUse the MS-DOS program PHDISK to create a new save-to-disk file.Swap File is missingUse the MS-DOS program PHDISK to...

5-6Troubleshooting Procedures Table 5-3Self Test Beep Messages
Beep CodePort 80hDescription2-4-11ChBit C, 1ST 64K RAM Failure2-4-21DhBit D, 1ST 64K RAM Failure2-4-31EhBit E, 1ST 64K RAM Failure2-4-41FhBit F, 1ST 64K RAM Failure3-1-120hSlave DMA Register Failure3-1-221hMaster DMA Register Failure3-1-322hMaster Interrupt Mask Register Failure3-1-423hSlave Interrupt Mask Register FailureNone25hInterrupt Vector Loading In Progress3-2-427hKeyboard Controller Test FailureNone28hCMOS Power Failure and Checksum...

Service Guide5-7 5.3.4 PCMCIA Modem Problems
If an optional PCMCIA modem does not work properly, check the following items:
· Dialing problem or wrong number - Try dialing a number that you have previously dialed
successfully.
· Faulty phone line - Connect a telephone to the line and listen for a dial tone.
· Software program - Check to ensure that you have installed the software correctly. 

C h a p t e r     6 C h a p t e r     6
Field ServiceService Guide6-1 6.1. Introduction
This chapter contains general  preventive and corrective maintenance procedures that apply to all
members of the Extensa 67x Series Notebook Computers. The first part of the chapter describes
the computer cleaning procedures and preferred handling procedures for sensitive components (e.g.
disk drives, batteries).
The second part of the chapter identifies all field-replaceable parts; the remainder of the chapter...