Compaq 100 schematic
CONTENTS
preface
Symbols.......................................................................................... ix
Technician Notes............................................................................. x
Serial Number.................................................................................. x
Locating Additional Information.................................................... x
chapter1
1.1 Computer Features and Models............................................1-1
1.2 System Memory Options.......................................................1-4
1.3 Power Management Functions..............................................1-5
1.4 Setup Configuration Utility (SCU).......................................1-6
1.5 Compaq Configuration Record Utility ...............................1-16
1.6 Gathering Information.........................................................1-17
1.7 Diagnostics..........................................................................1-19
1.8 Computer External Components.........................................1-20
1.9 Design Overview.................................................................1-24
chapter2
2.1 Service Considerations..........................................................2-1
2.2 Basic Troubleshooting Checklist..........................................2-1
2.2 Power-On Self Test (Post) ....................................................2-2
2.3 Solving Common Problems..................................................2-5
2.4 Test Errors.............................................................................2-7
chapter3
3.1 Serial Number Location........................................................3-1
3.2 Computer System Major Components..................................3-2
3.3 Miscellaneous Plastic Kit Components................................3-4
3.4 Hardware Kit Components....................................................3-5
3.5 Cable Kit Components..........................................................3-6
3.6 Mass Storage Devices...........................................................3-7
3.7 Miscellaneous........................................................................3-8
chapter4
4.1 Tools Required......................................................................4-1
4.2 Service Considerations..........................................................4-1
Contents v
4.3 Preventing Damage to Removable Drives ........................... 4-2
4.4 Preventing Electrostatic Damage.......................................... 4-3
4.5 Packaging and Transporting Precautions............................. 4-4
4.6 Workstation Precautions....................................................... 4-4
4.7 Grounding Equipment and Methods .................................... 4-5
chapter5
5.1 Serial Number....................................................................... 5-1
5.2 Disassembly Reference Chart............................................... 5-2
5.3 Preparing the Computer for Disassembly ............................ 5-3
5.4 Battery Pack.........................................................................5-4
5.5 Modem .................................................................................. 5-5
5.6 Fan Assembly........................................................................ 5-8
5.7 CD-ROM Drive................................................................... 5-10
5.8 Processor............................................................................. 5-12
5.9 Memory............................................................................... 5-15
5.10 Top Cover.......................................................................... 5-17
5.11 Hard Drive......................................................................... 5-19
5.12 Real Time Clock (RTC) Battery....................................... 5-20
5.13 Keyboard........................................................................... 5-21
5.14 EMI Shield........................................................................5-23
5.15 Touchpad........................................................................... 5-25
5.16 Speakers ............................................................................ 5-26
5.17 Display Assembly............................................................. 5-27
5.18 Speaker Housing...............................................................5-32
5.19 System Board.................................................................... 5-34
5.20 Diskette Drive................................................................... 5-38
chapter 6
SPECIFICATIONS
appendix A
CONNECTOR PIN ASSIGNMENTS
appendix B
POWER CORD SET REQUIREMENTS
3-Conductor Power Cord Set.......................................................B-1
Country-Specific Requirements...................................................B-2
INDEX .......................................................................................................I-1
vi Contents
chapter
1
PRODUCT DESCRIPTION
1.1 Computer Features and Models
The Compaq Notebook 100 Series offers an AMD K6-2 475-MHz
processor, a 12.1-inch SVGA TFT or HPA display, a 5.0-GB hard drive,
and a 24X Max CD-ROM drive. The computer also comes equipped with
a TouchPad pointing device and 4 MB of video SDRAM.
Figure 1-1. Compaq Notebook 100 Series
Product Description 1-1
Models
The Compaq Notebook 100 Series is available in the models shown in
Table 1-1. The computer serial number is located on a bar code on the
bottom of the computer and identifies the model’s features.
Table 1-1
Compaq Notebook 100
Model Naming Convention
Example: serial number N10 K2 475 T1S 5 M 64 98
Key
A K2 475 T2S 5 M 64 98
1 2345678
KEY DESCRIPTION OPTIONS
1 Brand designator A = Notebook 100
2 Processor K2 = AMD k6-2
3 Processor speed 475 = 475-MHz
4 Display T2S = 12.1”, CTFT, SVGA H2S = 12.1”, HPA, SVGA
5 Hard drive size (MB) 5 = 5.0 MB
6 Integrated
communication
7 RAM (in MB) 64 = 64 MB 32 = 32 MB
8 Operating system 98 = Microsoft
M = Modem 0 = None
Windows 98
2 = Microsoft Word
2000
SB = Microsoft Small
Business
Table 1-2
Compaq Notebook 100 Models
12345678 SKU#
A K2 475 T2S 5 M 64 98/2 175844-XX4 FFG1
A K2 475 T2S 5 M 64 98 180641-XX4 FFG2
A K2 475 T2S 5 M 64 98 180641-XX5 FFG2
A K2 475 T2S 5 0 64 98/2 180097-XX4 FFG3
A K2 475 T2S 5 M 64 98/SB 175599-XX4 FFG4
A K2 475 H2S 5 M 32 98/2 175843-XX4 FFF1
A K2 475 H2S 5 M 32 98 180640-XX4 FFF2
A K2 475 H2S 5 M 32 98 180640-XX5 FFF2
A K2 475 H2S 5 0 32 98/2 180096-XX4 FFF3
A K2 475 H2S 5 M 32 98/SB 175598-XX4 FFF4
A K2 475 H2S 5 M 64 98/2 180095-XX4 FFF5
A K2 475 H2S 5 M 64 98/SB 180094-XX4 FFF6
1-2 Product Description
Config.
Code
Features
The Compaq Notebook 100 Personal Computer has the following
features:
■ AMD K6-2 475-MHz processor with 512 KB integrated L2 cache.
■ 64-MB 100-MHz SDRAM, expandable to 192 MB, or 32-MB
100-MHz SDRAM, expandable to 160 MB, varying by computer
model. The Compaq Notebook 100 also features a SODIMM
memory expansion slot, capable of accepting a memory expansion
board of 32-, 64-, or 128-MB.
■ Primary memory cache is 64 KB; secondary memory cache is
512 KB.
■ 12.1-inch SVGA TFT or HPA (800 × 600) color display, varying by
computer model. These display feature:
■ over 16.8 million colors.
■ integrated Trident CyberBlade AGP2 controller bus.
The computer also features external monitor support with 4G color
(640 × 480, 800 ×600, 1024 ×768, 1280 ×1024), with up to 60-, 75-,
or 85-Hz refresh rate.
■ Microsoft Windows 98, professional or standard edition,
preinstalled.
■ Keyboard with TouchPad pointing device.
■ 56-Kbps AC97 modem (not supported in DOS mode).
■ External AC adapter with 6-foot power cord.
■ A 9-cell NiMH battery pack is standard equipment on the Compaq
Notebook 100 Personal Computer. An 8-cell Li ion battery pack is
available as an option.
■ One Type II PC Card slot with support for both 32-bit CardBus and
16-bit PC Cards.
■ Mass storage devices include a 5.0-GB hard drive, 3.5-inch,
1.44-MB diskette drive, and 24X Max CD-ROM drive.
■ Connectors for parallel, serial, audio in/out, external monitor,
universal serial bus, external keyboard, and AC power. An infrared
port is also available.
Product Description 1-3
1.2 System Memory Options
Depending on the computer model, the main memory subsystem supports
a minimum of 32 or 64 megabytes of Synchronous SDRAM, expandable
to 160 or 192 megabytes. The minimum standard Synchronous SDRAM
is integrated on the system board. The upgrade SDRAM is accomplished
with memory expansion boards that are available on 128-, 64-, and 32megabytes.
The memory expansion slot is located underneath the fan/CPU cover.
Refer to Chapter 5, “Removal and Replacement Procedures,” for
information on installing and removing memory expansion boards.
System memory can be upgraded as shown in Table 1-3.
Table 1-13
Memory Upgrade
Base Memory on System Board Memory Expansion Board Total Memory
32 MB 32 MB 64 MB
32 MB 64 MB 96 MB
32 MB 128 MB 160 MB
64 MB 32 MB 96 MB
64 MB 64 MB 128 MB
64 MB 128 MB 192 MB
1-4 Product Description
1.3 Power Management Functions
Power Management functions of the computer are designed to conserve
power. All Power Management functions can be configured from the
Setup Configuration Utility (SCU), described later in this chapter.
Automatic Power Management
Automatic Power Management operates at two levels as described in the
following paragraphs.
Local Power Management
Local Power Management controls computer subsystems. When a
subsystem is inactive for a period of time, it is automatically shut down
or slowed to reduce power consumption. The subsystem returns to an
active state when it is accessed.
Subsystems under Power Management include:
■ Hard disk drive
■ Diskette drive
■ CD-ROM drive
■ LCD display panel
Global Power Management
Global Power Management automatically puts the computer into Suspend
mode when the computer is inactive for a period of time. The computer
wakes up whenever activity resumes.
The time-out settings for Suspend mode are set up in the SCU program.
The computer uses Suspend-to-RAM (Standby) or Suspend-to-Disk
(Hibernation) depending on the Suspend Data To setting in the SCU
program.
Manual Power Management
Suspend mode can be initiated at any time in one of two ways:
■ By pressing Fn + F12.
■ By closing the top cover, if the Cover Close option is set to Suspend
in the SCU program.
Product Description 1-5
Suspend-to-Disk (Hibernation)
When the computer suspends to disk, the system preserves all the running
application programs as a file in a Suspend-to-Disk partition on the hard
disk. The computer then turns off automatically. When the computer is
powered on, the system reads the file from the Suspend-to-Disk partition
back into memory, returning the computer to the state it was in before it
was suspended.
If there is no Suspend-to-Disk partition on the hard disk, use the
HIBERNAT utility to create the partition, in order to be able to use the
Suspend-to-Disk feature.
Suspend-to-RAM (Standby)
When the computer suspends to RAM, several subsystems enter standby
or power-off mode to conserve power. The system wakes up when any
key is pressed. Resume Timer and Ring Resume options also wake the
system from Suspend-to-RAM.
1.4 Setup Configuration Utility (SCU)
The system comes with a Setup Configuration Utility (SCU). This utility
configures BIOS settings via menu-driven utilities. Settings are stored in
the CMOS RAM.
The SCU must be used when:
■ An error message indicates that the SCU should be run.
■ Factory default settings need to be restored (after BIOS upgrades).
■ Specific settings must be modified.
Starting the SCU
The SCU resides on the system ROM chip. Start the utility by pressing
F10 during initial power up.
1-6 Product Description
Main SCU Screen
The SCU main screen is divided into three areas:
Menu area – lists the available menu titles, across the top of the screen.
Each menu title provides a pull-down menu of item settings.
Display area – displays current system settings. This section also
displays submenus for items that provide multiple options.
Information and navigation area – provides keyboard/mouse
instructions for moving around and making decisions.
You can select items using either the keyboard or the TouchPad/mouse.
Product Description 1-7
Startup Menu
The Startup pull-down menu contains basic system configuration
settings.
Startup Menu
Item Function Default
Date and
Time
Fast Boot When enabled, speeds up the booting
Boot
Device
Set Admin
password
Set User
password
Sets the system date and time. N/A
procedure by bypassing the memory test. This
option does not include a sub-menu. A check
mark indicates Enabled. An underline
indicates Disabled.
Sets the boot device sequence. If all booting
options are set to the same device, the
computer tries to boot only from that device.
Allows the creation of an administrator-level
password. This controls whether a nonadministrator can boot the system or enter the
SCU utility.
Sets up a user-level password. This controls
booting, running the SCU, or resuming the
system.
Enabled
Diskette A
Hard Drive C
CD-ROM Drive
■ An Administrator password must be set up prior to attempting to set
up a User password.
■ The Administrator password must be used to make changes in the
SCU. The User password only allows browsing.
1-8 Product Description
Memory Menu
The Memory pull-down menu controls memory usage. The setting
enables or disables usage of L2 cache memory. The default setting is
Enabled.
Disks Menu
The Disks menu contains settings that configure the system diskette drive
and hard drive. It also sets the virus alert option.
Product Description 1-9
Disks Menu
Item Function Default
Internal
FDC
Sets when an internal diskette drive is present.
A check mark indicates that the item is
Enabled. An underline indicates Disabled.
Enabled
Diskette
Drives
Internal
HDC
IDE
Settings
Virus Alert Provides warning messages if the hard disk
Sets the type of diskette disk. 1.44MB
Sets when an internal hard drive is present. A
check mark indicates that the item is Enabled.
An underline indicates Disabled.
Sets the type of hard disk drive in the system.
HDD Timing – Sets the data transmit mode of
the hard drive. The default is Ultra DMA-33.
I/O 32 bit Transfer – If enabled, allows for a
faster transfer rate. The effect is more
noticeable under DOS. The default setting is
Enabled.
HDD Block Transfer – If enabled, allows for a
large capacity hard disk. The default setting is
Enabled.
boot sector (partition table) has changed. A
checkmark indicates that the item is Enabled.
An underline indicates Disabled.
Enabled
N/A
Enabled
1-10 Product Description
Components Menu
The Components menu changes settings on various components such as
COM and LPT ports.
Components Menu
Item Function Default
Com Port Assigns COM1 and COM2 to specific
LPT Port Sets the address for the LPT (parallel) port.
Keyboard
Numlock
Keyboard
Repeat
functions. In general, assign COM1 to RS-232
(the serial port); then assign COM2 to IR.
Mode Setting for COM B – Sets the IR mode
for COM B. The mode depends on the type of
device that the computer will communicate
with.
This system supports Enhanced Parallel Port
(EPP) and Extended Capabilities Port (ECP)
standards. If the port is set to ECP, choose a
DMA channel setting for that port.
Sets the function of the numeric keypad. If you
disable this option, the numeric keypad on the
computer will not function, even if the Num
Lock indicator is on. However, an external
keyboard is not affected by this feature.
Sets the repeat rate and delay time of
keystrokes. The Key Repeat Rate sets the
repeat rate while holding down a key. The Key
Delay item sets delaying time between key
repeats.
Enabled
Product Description 1-11
Power Menu
The Power menu contains Power Management settings that help conserve
system power.
Enable Power Saving – This is the master control for the Power
Management features. If disabled, all Power menu items with the
exception of Suspend Controls are automatically disabled.
Timeout Settings – Sets up timeout functions. Note that some operating
systems such as Windows 98 have built-in APM/ACPI configurations
that could override these settings.
Item Function
Video
Timeout
Disk
Timeout
Global
Timeout
1-12 Product Description
Sets the timeout period for the monitor to power down if not used
during a set period. The monitor powers up again when a key is
pressed. Available options are 30 Sec, 2 Min, 5 Min, 10 Min,
15 Min, and Always On.
Sets the timeout period for the hard disk to power down if not
accessed during the set period. The hard disk powers up again
when next accessed. Available options are 30 Sec, 1 Min,
1.5 Min, 2 Min, and Always On.
Sets the timeout period for the whole system to power down if
not in use during a specified period. The system powers up
again once any key is pressed. Available options are 1 Min,
2 Min, 4 Min, 6 Min, 8 Min, 12 Min, 16 Min, and Always On.
Power Menu
continued
Power Menu continued
Item Function
Monitor
Video
Activity
Suspend
Timeout
Suspendto-Disk
Sets up the system to monitor video activity. If enabled, any
activity on the screen (such as displaying a movie) prevents the
monitor from powering down. Available options are Enabled or
Disabled.
Sets the timeout period for the system to enter Suspend Mode if
not in use during a pre-set period.
The Suspend Mode is determined by the “Suspend Type” item in
the “Suspend Controls” submenu. Choices may be Suspend-toRAM or Suspend-to-Disk.
When Suspend-to-RAM (Standby) mode is initiated, several
subsystems enter standby or power-off mode to conserve power.
The system wakes up when a key is pressed. “Resume Timer”
and “Ring Resume” items will also wake the system from
Suspend-to-RAM mode.
When Suspend-to-Disk (Hibernation) mode is initiated, the
system preserves all running application programs as a file in a
suspend-to-disk partition on the hard disk. Available options are
1 Min, 5 Min, 10 Min, 20 Min, 30 Min, and Never.
Sets the timeout period for the system to enter Suspend-to-Disk
mode if not in use during a set period.
When Suspend-to-Disk mode is initiated, the system preserves
all running application programs as a file in a suspend-to-disk
partition on the hard disk. Available options are 1 Min, 5 Min,
10 Min, 20 Min, 30 Min, and Never.
The Suspend-to-Disk item functions regardless of the “Suspend
Timeout” setting and the “Suspend Type” setting in the “Suspend
Controls” submenu. If the timing of this item is shorter that that of
“Suspend Timeout”, the system directly enters Suspend-to-Disk
mode if inactive for the timing.
Product Description 1-13
Suspend Controls – Manages several suspend features.
Suspend Controls Menu
Item Function
Power
Button
Function
Lid Switch
Function
Suspend
Type
Sets the function of the Power button. Available options are
Power On/Off and Suspend/Resume. If this item is set to
Suspend/Resume, holding down the button for 5 seconds will
turn off power.
Sets the sequential event when the top cover is closed with
power still available. The available options are Blank LCD and
Suspend/Resume.
Sets the suspend mode the system enters if it stays inactive for
the time specified in the “Suspend Timeout” item.
Ring Resume – Enables or disables the system from waking up from
Suspend-to-RAM mode when the modem receives an incoming call.
Resume Timer – Sets the date and time the system resumes from
suspend mode. The default setting is Disabled.
Advance CPU Controls – Sets up further advanced CPU functions.
Advance CPU Controls Menu
Item Function
Clock
Control
Mechanism
Clock Run
Enable
Sets the CPU activity under normal condition. The available
options range from 6% to full speed (Disabled). Note that
although this item sets the usage of CPU resources, the CPU
can still reach its full speed if the system is under a heavy job
load.
Enables whether the system can take advantage of the
Southbridge chipset to help transmit data, thereby reducing the
CPU job load.
1-14 Product Description
Exit Menu
The Exit pull-down menu displays ways of exiting SCU. This menu also
restores default settings and displays BIOS version information.
When troubleshooting the Compaq Notebook 100, it is important to
obtain all facts about the situation. Obtain details of the problem and any
circumstances surrounding the problem. Obtain all error codes or beep
codes. Once all facts have been gathered, determine possible causes and
search for issues.
Product Description 1-15
1.5 Compaq Configuration Record Utility
Compaq Configuration Record Utility is an online information-gathering
tool meant to replace the DOS based Inspect utility. It runs from within
Windows and gathers critical hardware and software information from
various sources to give a complete view of the computer. The Compaq
Configuration Record Utility delivers comprehensive configuration
capture, provides a means for automatically identifying and comparing
configuration changes, and has the ability to maintain a computer
configuration history. The information can be saved as a history of
multiple sessions.
The Compaq Configuration Record Utility captures data as sessions; a
session is defined as an organized group of data describing the configured
state of the system at a specific point in time.
The session information is maintained in a log file, located in the same
directory as the executable portion of the program. This file contains all
of the ASCII text configuration information captured for a session. This
file can be analyzed locally by the Configuration Record Utility, or it can
be sent to another location such as a help center, or to Compaq.
The sessions are organized as two distinct types:
Active
The Active session (referenced as session now.log) is the most recent
information captured. The utility overwrites this session each time a
sample is taken.
Original
The Original session (referenced as session base.log) is the first session
sampled. The Compaq Configuration Record Utility will treat this
session as a "master configuration" and the utility will never overwrite
this session.
1-16 Product Description
1.6 Gathering Information
The comparison feature provides several reports that enable the
administrator to specify the particular type and level of information that
will be most useful in a particular case. The different report types
available are:
Show Only Differences Report
This feature provides a mechanism for filtering the level of information
displayed when comparing two different configuration snapshots (or
sessions). For example, when a user requests that Configuration Record
Utility generate a comparison of sessions using the “differences” filter,
the tool automatically compares those two sessions (which are already
stored in a Configuration Record file). It then generates a report that
shows only the differences between the two generations. In this case, the
differences report will include all information recorded, such as changes
in amounts of free memory. Reviewing the differences occurring between
different configuration snapshots can help identify trends causing
intermittent computer problems, such as low memory resources.
Product Description 1-17
Show Details and Differences Report
This report provides the level of detail that is necessary for service
personnel to get a clear picture of the system configuration. It provides a
much greater depth of information on hardware, operating system
services, and drivers that are running on the computer.
The Compaq Configuration Record Utility is supported under
Windows 95, Windows 98, and Windows NT 4.0. This utility is available
on SoftPaq.
1-18 Product Description
1.7 Diagnostics
Using Compaq Diagnostics
■ Access Compaq Diagnostics for Windows by selecting
StartÅSettingsÅControl PanelÅCompaq Diagnostics.
■ To select a category, choose one of two methods:
■ Select the Categories menu, then select a category from the drop-
down list.
■ Select a category icon on the toolbar.
To run diagnostic tests:
1. Select the Test tab.
2. In the scroll box, select the category or device you want
to test.
3. Select the Quick, Complete, or Custom test type.
4. Select the Interactive or Unattended test mode.
5. Select the Begin Testing button.
6. View test information by selecting a report from the Status, Log, or
Error tab.
■ To print the information or save it to a drive, select the File menu,
then select Print or Save As.
7. To exit, select the File menuÅExit.
Product Description 1-19
1.8 Computer External Components
The external components on the display and right side of the computer
are shown in Figure 1-2 and described in Table 1-2.
Figure 1-2. Display and Right Side Components
Table 1-2
Display and Right Side Components
Item Component Function
1 TouchPad and touch
buttons
2 Keyboard Provides numeric keypad, 12 function keys,
3 Stereo speakers Produce high-quality stereo sound.
4 Activity lights Indicate AC/battery power, mass storage,
5 Display release latch Opens the computer.
6 Microphone Allows for audio input.
7 Volume control Adjusts the volume of the stereo speakers.
8 CD-ROM drive Accepts CD-ROM disks.
9 Infrared port Provides wireless communication between
10 Diskette drive Accepts 3.5-inch diskettes.
The TouchPad moves the mouse cursor,
selects, and activates.
The touch buttons function like the left and
right mouse button on an external mouse.
and special fn keys
and keyboard lock status.
the computer and another infraredequipped device using an infrared beam.
1-20 Product Description
The external components on the left side of the computer are shown in
Figure 1-3 and are described in Table 1-4.
Figure 1-3. Left Side Components
Table 1-3
Left Side Components
Item Component Function
1 Security cable slot Accepts an optional security cable to secure
2 Power button Turns the computer on or off or exits
3 RJ-11 jack (internal
modem models only)
4 PC Card slot Supports 32-bit (CardBus) and 16-bit
5 Battery pack Accepts either the standard 9-cell NiMH or
the computer to a fixed object to prevent
theft.
Standby.
Connects the modem cable to an internal
modem.
PC Cards.
optional 8-cell Li ion battery packs. The
battery pack supplies power to the computer
of external power is not available.
Product Description 1-21
The external components on the rear of the computer are shown in Figure
1-4 and described in Table 1-5.
Figure 1-4. Rear Components
Table 1-4
Rear Components
Item Component Function
1 Mono microphone jack Connects a mono microphone, disabling
2 Stereo speaker/
headphone jack
the built-in microphone.
Connects stereo speakers, headphones, or
headset.
This jack is driven by an amplifier and has
volume control. The internal computer
speakers are turned off when external
speakers or headphones are plugged into
this jack.
continued
1-22 Product Description
Table 1-4 continued
Item Component Function
3 Universal Serial Bus
(USB) connector
4 Parallel connector Connects an optional parallel device, such
5 Serial connector Connects optional serial devices, such as a
6 External monitor
connector
7 Keyboard/mouse
connector
8 AC Adapter connector Connects the AC power adapter.
Connects USB devices, such as cameras
for video conferencing, or hubs which
connect multiple USB devices.
The USB connector is a powered hub.
When running Windows 98, any
combination of up to five powered or
unpowered hubs can be connected in any
sequence, as long as two unpowered hubs
are not connected next to each other.
When running a lower version of Windows,
or if using a different operating system, up
to two hubs can be connected.
as a printer.
mouse.
Connects an optional external monitor,
overhead projector, or TV adapter.
Connects an optional full-sized keyboard or
a mouse. Both external mouse and
computer pointing device are active. An
optional splitter/adapter allows both an
external keyboard and mouse to be used at
the same time.
Product Description 1-23
1.9 Design Overview
This section presents a design overview of key parts and features of the
computer. Refer to Chapter 3 for the illustrated parts catalog and
Chapter 5 for removal and replacement procedures.
The system board provides the following device connections:
■ Memory expansion board
■ Hard drive
■ Display
■ Keyboard/TouchPad
■ Audio
■ AMD K6-2 processor
■ Fan
■ PC Cards
■ Modem or modem/NIC
The Compaq Notebook 100 uses an electrical fan for ventilation. The fan
is controlled by a temperature sensor and is designed to turn on
automatically when high temperature conditions exist. These conditions
are affected by high external temperatures, system power consumption,
power management/battery conservation configurations, battery fast
charging, and software applications. Exhaust air is displaced through the
ventilation grill located on the right side of the computer.
CAUTION: To properly ventilate the computer, allow at least a
3-inch (7.6 cm) clearance on the left and right sides of the
computer.
1-24 Product Description
chapter
2
TROUBLESHOOTING
2.1 Service Considerations
When troubleshooting the Compaq Notebook 100, it is important to
obtain all facts about the situation. Obtain details of the problem and any
circumstances surrounding the problem. Obtain all error codes or beep
codes. Once all facts have been gathered, determine possible causes and
search for issues.
2.2 Basic Troubleshooting Checklist
Use the following checklist in the event minor problems are encountered:
■ Is the computer connected to an external power source or does it
have a fully charged battery pack installed?
■ Is the computer turned on and is the power indicator illuminated?
■ Are all cables connected properly and secure?
■ Did the diskette drive contain a non-bootable diskette when the
system was powered up?
■ Does the computer have all necessary device drivers?
■ Have printer drivers been installed for each application?
■ Was the Windows operating system properly exited?
■ Has the computer hard drive been scanned for viruses?
Troubleshooting 2-1
2.2 Power-On Self Test (Post)
When the computer starts, the system BIOS runs a series of internal
checks on the hardware. This allows the computer to detect problems as
early as the power-on stage. The POST alerts you to problems by
displaying error messages.
If POST detects an error, the system displays an error message on the
display. If the error occurs before the display comes up, error codes or
system beeps indicate the POST error.
The value for diagnostic POST (378H) is written at the beginning of the
test. Therefore, if the test fails, you can determine where the problem
occurred by reading the last value written to POST 378H by the PIO
Debug Board Plug at the PIO port. The following table lists error codes
in sequential order on the PIO Debug Board.
Table 2-1
Error Codes
Code Description
01h Start of boot loader sequence.
02h Initialize chipset.
03h Memory sizing.
04h Perform conventional RAM (1st 640K) test with crossed
pattern R/W.
05h Move boot loader to the RAM.
06h Start point of execution of boot loader in RAM.
07h Shadow screen BIOS.
08h Initialize clock synthesizer.
09h Initialize audio controller.
0Ah Detect internal ISA modem.
0Bh Proceed with normal boot.
0Ch Proceed with crisis boot.
0Fh DRAM sizing
10h Initial L1, L2 cache, make stack and diagnose CMOS.
11h Turn off fast A20 for post, Reset GDT’s, 8259’s quickly.
continued
2-2 Troubleshooting
Table 2-1 continued
Code Description
12h Signal power on reset on COMS.
13h Initialize the chipset (DRAM).
14h Search for ISA bus VGA adapter.
15h Reset counter/timer 1, excite the RAM.
16h User register config through CMOS.
18h Dispatch to 1st 64K RAM test.
19h Checksum the ROM.
1Ah Reset PIC’s (8259s).
1Bh Initialize video adapter(s)
1Ch Initialize video (6845 regs).
1Dh Initialize color adapter.
1Eh Initialize monochrome adapter
1Fh Test 8237A page registers.
2Oh Perform keyboard self-test.
21h Test and initialize keyboard controller.
22h Check if CMOS RAM valid.
23h Test battery fail & CMOS X-SUM.
24h Test DMA controllers.
25h Initialize 8237 controller.
26h Initialize interrupt vectors table.
27h RAM quick sizing.
28h Protected mode entered safely.
29h RAM test completed.
2Ah Protected mode exit successful.
2Bh Setup shadow.
2Ch Prepare to initialize video.
2Dh Search for monochrome adapter.
2Eh Search for color adapter, VGA initialize
continued
Troubleshooting 2-3
Table 2-1 continued
Code Description
2Fh Signon messages displayed.
30h Special init of keyboard ctlr.
31h Test if keyboard present.
32h Test keyboard interrupt.
33h Test keyboard command Byte.
34h Test, blank and count all RAM.
35h Protected mode entered safely (2).
36h RAM test complete.
37h Protected mode exit successfully.
38h Update keyboard output port to disable gate of A20.
39h Setup cache controller.
3Ah Test if 18.2Hz periodic working.
3Bh Initialize BIOS data area at 40.0.
3Ch Initialize the hardware interrupt vector table.
3Dh Search and initialize the mouse
3Eh Update NUMLOCK status.
3Fh OEM initialization of COM and LPT ports.
40h Configure the COM and LPT ports.
41h Initialize the diskette drive.
42h Initialize the hard disk.
43h OEM’s unit of PM with USB.
44h Initialize additional ROMs.
45h Update NUMLOCK status.
46h Test for coprocessor installed.
47h OEM’s unit of power management (check SMI).
48h OEM’s functions before boot (PC Card, CardBus).
49h Dispatch to operation system boot.
4Ah Jump into bootstrap code.
2-4 Troubleshooting
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