Acer Extensa 570 Mantenance Manual

							 Table 4-1   Extensa Series I/O Address Map
Address Range Device
000-00F DMA Controller 1
020-021 Interrupt Controller 1
022-023 M1429 Registers
040-043 T imer 1
060-06E Keyboard Controller 8742 Chip Select
070-071 Real T ime Clock and NMI Mask
080-08F DMA Page Register
0A0-0A1 Interrupt Controller 2
0C0-0DF DMA Controller 2
1F0-1F7 Hard Disk Select
178, 17A 6377 Registers
1F0-1F7 Hard Disk Select
3F6, 3F7
278-27F Parallel Port 3
35F, 36F Special I/O Ports
378, 37A Parallel Port 2
3BC-3BE Parallel Port 1
3C0-3C5
3C6-3C9 Video DAC
3C0-3CF Enhanced Graphics Display
3D0-3DF Color Graphics Adapter
3E0-3E1 PCMCIA Controller
3F0-3F7 Floppy Disk Controller
3F8-3FF Serial Port 1
   
 Theory of Operation 4-3 
						

							Table 4-2  DMA Channels
Controller Channel Address Function
1 0 0087 Spare
1 1 0083 Spare
1 2 0081 Diskette
1 3 0082 Spare
2 4 Cascade Cascade
2 5 008B Spare
2 6 0089 Spare
2 7 008A Spare
Table 4-3  IRQ Interrupt Levels
Priority Interrupt
NumberInterrupt Source
1 SMI Power management unit
2 NMI Parity Error Detected, I/O Channel Error
3 IRQ0 Interval Timer, Counter 0 Output
4 IRQ1 Keyboard
IRQ 2 Interrupt from controller 2 (cascade)
5 IRQ8 Real Time Clock
6 IRQ 9 Cascaded to INT 0AH (IRQ 2)
7 IRQ10 Reserved
8 IRQ 11 Reserved
9 IRQ 12 PS/2 Mouse
10 IRQ13 INT from Coprocessor
11 IRQ14 Hard Disk Controller
12 IRQ15 Reserved
13  IRQ3 Serial Comm Port 2
14 IRQ4 Serial Comm Port 1
15 IRQ5 Reserved
16 IRQ6 Diskette Controller
   
4-4 
 Theory of Operation 
						

							Priority Interrupt
NumberInterrupt Source
17 IRQ7 Parallel Port
n
Note:
 A PCMCIA card can use IRQ 3, 4, 5, 7, 9 and 11 as long as it does not
conflict with the interrupt address of any other device.
4.2.2 I/O Subsystem
The I/O subsystem, implemented with an SMC37C655IR Super I/O
Controller Chip, provides for such functions as internal floppy drive control,
serial and parallel ports and support for the Serial Infrared port. The Super
I/O Controller includes the following features:
·100 percent compatible with ISA, EISA, and micro-channel architectures
· Built-in floppy disk controller
·Two UARTs
·
Software compatible with the PC16550A and PC16450
·
MIDI compatible
·
Infrared support on UAR T2 (IRDA-compliant)
·Bidirectional Parallel Port
·
Enhanced Parallel Port (EPP) compatible
·
Extended Capabilities Port (ECP) compatible, including level 2
support
·
Bidirectional under either software or hardware control
·
Compatbile with ISA, EISA, and Micro Channel architectures
·
Ability to multiplex FDC signals on parallel port pins for
external FDD
·
Includes protection circuit against damage caused when
printer is powered up, or operated at higher voltages
·Integral address decoder- provides selection of all primary and
secondary ISA addresses including COM1-4 and LPT1-3.
·Enhanced Power Management Function
·
Enhanced programmable power -down and wake-up modes
   
 Theory of Operation 4-5 
						

							·Auto power -down and wake-up modes
·Typical current consumption during power -down is less than
10A
4.2.3 Video Subsystem
The video subsystem, implemented on the Main Board and on the LCD
Display Unit, displays text, graphics and drives an external SVGA port. The
video subsystem is implemented with a CirrusÔ Logic CL-GD 7543 high
performance VGA controller and supporting logic and video RAM (1 MB).
The major features of the VGA controller include:
·Highly integrated design (flat panel / CRT VGA controller, RAMDAC,
clock synthesizer)
·Multiple Bus Architecture Integrated Interface
· Local Bus (32-bit CPU Direct and VL)
· EISA/ISA (PC/ATÔ) 16-bit Bus
·Integrated programmable linear address feature accelerates GUI
performance
·Supports panel resolutions up to 1280 X  1024 resolution including 800
X 600 and 1024 X 768
·SMARTMAP intelligent color to gray scale conversion enhances text
legibility
·Text enhancement feature improves white text contrast on flat panel
displays
· Fully Compatible with IBM SVGA
4.2.3.1 External SVGA Drive Capability
The Extensa 57Xcontains an external SVGA port (15-pin, female, D-type
connector) which can be used to drive an external CR T (standard SVGA
modes with resolutions of 800 X 600 X 256, or 640 X 480 X 256).
4.2.4Hard Disk Subsystem
The Hard Disk Subsystem, controlled by the IDE interface compatible
82C558N IPC chip, provides disk storage for all system software and user
files. Initially, the 57X Series Notebooks are equipped with a removable 810
or 1200 Million Byte hard drive.
During the manufacturing process, Texas Instruments formats the hard
disk and then loads all supplied software including Windows 95.
   
4-6 
 Theory of Operation 
						

							c
Caution: Formatting the disk drive erases any data that may be stored
on the disk. Therefore do not attempt a format of the hard disk unless
the computer self test and diagnostics confirm that the disk has not
been formatted.
A Hard Drive activity ICON is located on the Status LED beneath the
Display Assembly. This ICON is visible during hard driver read/write
accesses.
cCaution:  The notebook should not be moved when the HDD ICON is lit
to prevent accidental damage to the hard drive. 
4.2.5Floppy Diskette Drive Subsystem
The Floppy Diskette Drive Subsystem consists of a Floppy Controller (part of
the Super I/O Chip, SMC37C655IR) and the removable Floppy Diskette
Drive. The Floppy Diskette Drive can read/write standard 3.5-inch
minidiskettes. The floppy drive installs in the Media Bay and can be
removed to install a CD-ROM drive or a second battery pack (Lithium Ion).
4.2.6CD-ROM Subsystem
Many of the Extensa 57x models are equipped with a removable 5.25 inch,
CD-ROM drive (4X or 6X speeds). The drive uses the standard ATAPI
interface.
The CD-ROM subsystem is controlled by the IPC (which also controls the
hard drive subsystem).
4.2.7PCMCIA Subsystem
The notebook is equipped with an on-board PCMCIA host adapter
(UM8366F) PCMCIA Controller) and sockets to support Type I, II, or III
options. The PCMCIA Controller has the following features:
· Single-chip PCMCIA host adapters
· Direct connection to ISA (PC AT) Bus
· Direct connection to PCMCIA 2.0 Bus
· PCMCIA 2.0- and JEIDA 4.1-compliant
· 82365SL-compatible register set, ExCA-compatible
· Automatic Low-power Dynamic Mode for lowest power consumption
· Programmable Suspend Mode
· Five programmable memory windows per socket
   
 Theory of Operation 4-7 
						

							· Two I/O windows per socket
· Programmable card access cycle timing
· 8- or 16-bit CPU interface
· 8- or 16-bit PCMCIA interface support
· ATA disk interface support
· Automatic flash memory timing support
· Easy host interface using ISA I/O addresses 03E0h, 03E1h
· Mixed-voltage (3.3V or 5V) operation
· Dual-socket-interface, 208-pin QFP
4.2.8Sound Subsystem (Model Dependent)
Some models of the Extensa 57x Series notebooks are equipped with a
16-bit stereo sound system including:
·Built-in microphone and stereo speakers
·Stereo line input (5-pin jack, DIP)
·Stereo Line Output (5-pin jack, DIP)
·External microphone input (5-pin jack, DIP)
·Audio chipset
The sound subsystem is physically implemented on the IR/Sound Board.
4.2.9Power Subsystem
The Power Subsystem consists of the following major parts:
·Power Management (hardware and software components)
·AC Adapter
·Power Supply Board
·Nickel Metal Hydride (NiMH) Battery Pack
·Optional Secondary Battery Pack (Lithium Ion) if not using the Media
Bay for a floppy drive or CD-ROM Drive
4.2.9.1 Power Management
The notebook is equipped with a power management function that
minimizes battery usage for prolonged battery operation and automatically
recharges the batteries when the notebook is used with an AC adapter.
   
4-8 
 Theory of Operation 
						

							The power management modes and warnings include the following:
·LCD standby mode
·Hard disk/CD-ROM standby mode
·System standby/suspend mode
·Battery-low warning
·Standby/suspend upon battery low
4.2.9.2 AC Adapter
The notebook uses an AC adapter with built in over voltage and short circuit
protection.
The adapter can with stand a continuous short-circuit to DC output without
damage to the notebook logic components and resets to the normal power
mode after the fault condition is removed.
4.2.9.3 Primary Battery Pack
The Extensa 57x Series Notebooks use a Nickel Metal Hydride battery as the
primary battery pack. Specifications for the primary battery pack are
provided in Table 4-4.
Table 4-4 Primary Battery Pack Specifications
Function Specifications
Battery type NiMH (Nickel Metal-Hydride)
Cell Type A
Nominal voltage 8.4 V
Cell energy capacity 4200 mAH
Nominal rated 
capacity27 Watt-hours
Charge and discharge
cycles500 (minimum)
   
 Theory of Operation 4-9 
						

							4.2.9.4 DC-DC Converter/Battery Charger Circuit
The power supply board includes two DC-DC Converter circuits and a
battery charging circuit that operate the notebook and charge the internal
batteries when the AC Adapter is attached to the notebook. The converters
operate from an input voltage between 7 VDC and 20 VDC (from the AC
adapter) and generate the regulated voltages required to power all internal
logic circuits and charge the internal batteries. When the AC adapter is not
used, the DC-DC converters are powered by the output of the internal
battery pack (s) (nominal 8.4V).
   
4-10 
 Theory of Operation 
						

							5
Troubleshooting Procedures
5.1General
This section provides the following information:
·Overview of the fault isolation process
·Guidelines for isolating computer malfunctions to replaceable
subassemblies 
·Instructions for executing diagnostics and interpreting error messages. 
5.2Overview of Fault Isolation Process
The fault isolation process (summarized in Figure 5-1) consists of the
following:
·Quick Check of the following:
·
Notebook power system (including battery packs and AC
Adapter connections)- refer to Paragraph 5.4.
·
Switch settings (ensure Power
 switch is On, and press
Standby 
switch to ensure that Notebook is not in Standby
mode; press Shift
 to ensure the notebook is not in
Auto-Suspend mode.
·
All external cabling (if any).
·
Check LCD Contrast adjustment (Dual Scan version only).
·Record and attempt to resolve any displayed error messages/LED
indications (refer to Paragraph 5.3 and Table 5-1).
·Record and attempt to resolve any series of beeps emitted from the
notebook indicating test failure (refer to Table 5-2).
Troubleshooting Procedures 5-1 
						

							START
COMPUTER
TROUBLE
INDICATION
?
DE AD
COM PUTER
SYMPTOMS
?
RUN
SELF TEST
ERROR
MESSAGE
?
MODEM
PROBLEM
?
RUN
DIAG NOSTI CS
DIAG NOSTI CS
E RROR MS G
?
NO
YES
NOYES
SEE PARAGRAPH
5.3.4
NO
YE SSEE PARAGRAPH
5.3.3
NO
SEE
PARAGRAPHS
5.3. 1 &  5.3. 2 NO
YES
YES
See Appendix B
(PC-Doctor)
When Power button 
is pressed, no indication
of power is present (dark
LCD, no Status icons lit, 
no disk drive activity, etc.)
Press Power button; 
Selftest automatically
runs when power turned on.
Figure 5-1  Troubleshooting Flowchart
   
5-2 
Troubleshooting Procedures