Dell latitude lm Service Manual
®
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/DWLWXGH® /0
6(59,&(0$18$/
®
Information in this manual is subject to change without notice.
1994–1996 Dell Computer Corporation. All rights reserved.
Printed in the United States of America. Reproduction in any manner whatsoever without the written permission of Dell Computer Corporation is strictly forbidden.
Trademarks used in this text: Dell, the DELL logo, and Latitude are registered trad emarks of Dell Computer Corporation; MS-DOS is a registered trademark of
Microsoft Corporation; Intel and Pentium are registered trademarks of Intel Corporation; IBM is a registered trademark of International Business Machines Corporation.
Other trademarks and tr ade names may be used in this document to refer to either the entities claiming the ma rks and names or their products. Del l Co mputer
Corporation disclai m s a ny proprietary interest in trademarks and trade name s othe r than its own.
June 1996 P/N 98085
Contents
Chapter 1
System Overview. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
System Features . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-1
Physical Description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-2
Status Display . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Keyboard Indicators . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
CD-ROM/Hard-Disk Drive Indicator. . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Diskette-Drive Access Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
PC Card Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
AC Power Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Battery Activity Indicator. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Battery Status Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-4
Battery Charge Gauge. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
Password. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-5
System Power . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Power Conservation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-6
Interrupt Assignments. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Technical Specifications. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Chapter 2
Initial Procedures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Initial User Contact. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Visual Inspection . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-1
Observing the Boot Routine . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-3
Eliminating Resource Conflicts . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
Getting Help . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 2-5
v
Chapter 3
Beep Codes and Error Messages . . . . . . . . . . . . . . . . . . 3-1
POST Beep Codes . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-1
System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Running the Dell Diagnostics. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-6
Chapter 4
Removing and Replacing Parts . . . . . . . . . . . . . . . . . . . 4-1
Recommended Tools . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Screw Identification and Tightening . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Precautionary Measures . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
ZIF Connectors. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Exploded Views of Components and Assemblies . . . . . . . . . . . . . . . . . . . . . 4-7
Factory Repair Parts and Assemblies. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-11
Deleting the Password . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Hard-Disk Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Diskette Drive. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
CD-ROM . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Memory Module. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
LCD Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Front Bezel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
LCD Panel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
Inverter Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Microphone . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
LCD Assembly Latches . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-27
Power/Suspend Indicator . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-28
Back Bezel . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Keyboard . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Top Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Speakers . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Status Display Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-35
I/R Device. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
Power Button . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
Touch Pad. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38
Bottom Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
Processor Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
Power Supply Board. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-41
vi
Audio Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
Main Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
Cache Board . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45
Index
Figures
Figure 1-1. Front View of the Portable Computer . . . . . . . . . . . . . . . . . . . 1-2
Figure 1-2. Back View of the Portable Computer . . . . . . . . . . . . . . . . . . . 1-2
Figure 1-3. Status Display Panel. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-3
Figure 4-1. Computer Orientation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-1
Figure 4-2. Screw Identification. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-2
Figure 4-3. Main Battery Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-3
Figure 4-4. Hard-Disk Drive Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-5. Options Bay Lock and Latch . . . . . . . . . . . . . . . . . . . . . . . . . . 4-4
Figure 4-6. Diskette Drive, Secondary Battery, or CD-ROM Removal. . . 4-5
Figure 4-7. PC Card Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-5
Figure 4-8. Releasing a ZIF Connector . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-6
Figure 4-9. Exploded View—Computer. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-7
Figure 4-10. Exploded View—LCD Assembly . . . . . . . . . . . . . . . . . . . . . . 4-8
Figure 4-11. Exploded View—Top Assembly. . . . . . . . . . . . . . . . . . . . . . . 4-9
Figure 4-12. Exploded View—Bottom Assembly . . . . . . . . . . . . . . . . . . . 4-10
Figure 4-13. Capacitor C146 (Location). . . . . . . . . . . . . . . . . . . . . . . . . . . 4-18
Figure 4-14. Hard-Disk Drive Disassembly . . . . . . . . . . . . . . . . . . . . . . . . 4-19
Figure 4-15. Diskette Drive Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-20
Figure 4-16. CD-ROM Assembly. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-21
Figure 4-17. Memory Module Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . 4-22
Figure 4-18. LCD Assembly Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-23
Figure 4-19. Front Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-24
Figure 4-20. LCD Panel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-25
Figure 4-21. Inverter Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-26
Figure 4-22. LCD Assembly Latches Removal . . . . . . . . . . . . . . . . . . . . . 4-27
Figure 4-23. Power/Suspend Indicator Removal . . . . . . . . . . . . . . . . . . . . 4-28
Figure 4-24. Back Bezel Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-29
Figure 4-25. Keyboard Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-30
Figure 4-26. Top Assembly Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-32
Figure 4-27. Speakers Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-34
Figure 4-28. Status Display Board Removal . . . . . . . . . . . . . . . . . . . . . . . 4-35
vii
Figure 4-29. I/R Device Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-36
Figure 4-30. Power Button Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-37
Figure 4-31. Touch Pad Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-38
Figure 4-32. Bottom Assembly . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-39
Figure 4-33. Processor Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-40
Figure 4-34. Power Supply Board Removal . . . . . . . . . . . . . . . . . . . . . . . 4-41
Figure 4-35. Audio Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-42
Figure 4-36. Main Board Removal . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-43
Figure 4-37. Cache Board Removal. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-45
Tables
Table 1-1. Interrupt Assignments . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-7
Table 1-2. Technical Specifications . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 1-8
Table 3-1. POST Beep Codes. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-2
Table 3-2. System Error Messages . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3-3
Table 4-1. Factory Repair Parts and Assemblies . . . . . . . . . . . . . . . . . . 4-11
Table 4-2. Naming Conventions. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4-17
viii
ix
ead This First
R
A prerequisite for using this manual to service Dell portable computers is a
basic knowledge o f IBM-compatible PCs and prior training in IBM-comp atible
PC troubleshooting techniques. In addition to information provided in this
manual, Dell provides the Reference and Troubleshooting Guide for trouble-
shooting procedures and instructions on using the Dell diagnostics to test
portable computers, and the online System User’s Guide for information about
system setup and operations.
arnings, Cautions, and Notes
W
Throughout this manual, there may be blocks of text printed in bold type or in
italic type. These blocks are warnings, cautions, and notes, and they are used as
follows:
WARNING: A WARNING indicates the potential for bodily harm and provides instructions for how to avoid the problem.
CAUTION: A CAUTION indicates either potential damage to hardware or
loss of data and provides instructions for how to avoid the problem.
NOTE: A NOTE provides helpful information about using the computer system.
xxixii
Chapter 1
y
System Overview
he Dell® Latitude® LM P-100SD and LM P-133ST are high-performance
T
multimedia portable computers that use the Intel® Pentium® microprocessor.
This chapter provides an overview of the components and subsystems of these
computers.
The individual model names within the Dell Latitude LM portable family indicate the type and operating frequency of the microprocessor and display used in
the computer. For example:
The Dell Latitude LM P-100SD contains a 100-MHz Pentium micro-
•
processor and an SVGA (S) dual-scan (D) STN LCD.
The Dell Latitude LM P-133ST contains a 133-MHz Pentium micro-
•
processor and an SVGA (S) active-matrix (T) TFT LCD.
S
stem Features
In addition to the standard features found in IBM®-compatible portable computers, the Dell Latitude LM includes the following new and/or advanced
features:
8 MB of nonremovable main memory on the main board. The memory
•
capacity can be increased up to 40 MB by installing a matched pair of
4-, 8-, or 16-MB memory modules in the memory upgrade sockets on the
main board.
An 11.3-inch dual-scan SVGA color display or a 12.1-inch active-matrix
•
SVGA display.
42-WH lithium ion battery (nine cells).
•
256-KB SRAM level-2 external cache and 16-KB internal cache.
•
NeoMagic 2070 video controller supporting all video features with a PCI
•
local bus.
Intel 430MX PCIset for system and PCI controller.
•
Built-in microphone and jacks for connecting external speakers, micro-
•
phones, and headphones.
Two new diagnostics tests (infrared and audio).
•
An options bay that lets users replace the secondary lithium ion battery or
•
diskette drive without turning off or rebooting the computer. This feature is
sometimes called hot swapping. The CD-ROM can be inserted or removed
while the computer is in suspend mode. This feature is sometimes called
System Overvi ew 1-1
warm swapping. However, the CD-ROM must be in the computer before or
LCD assembly
keyboard
options bay
touch pad
atch
(2)
power button
hard-disk
drive
bay main-battery
compartment
microphone
status display
panel
power
/suspend
ndicator
touch pad
button (2)
display close
button
during boot in order for the drivers to load.
Built-in serial infrared transmitter/receiver, effective to 1 m (3.3 ft).
•
Support for connecting an external diskette drive to the parallel connector
•
on the I/O panel.
P
hysical Description
i
l
Figure 1-1. Front View of the Portable Computer
infrared port
serial port connector
parallel port connector
monitor connector
I/O panel
Figure 1-2. Back View of the Portable Computer
service tag number
expansion connector
PS/2 connector
headphones/speakers
connector
external
microphone connector
AC adapter
connector
PC Card slots
1-2 Dell Latitude LM Systems Service Manual
Status Display
.
Figure 1-3. Status Di splay Panel
The status display panel is located directly above the keyboard. This panel
shows icons that indicate keyboard operation or suspend mode; CD-ROM,
hard-disk drive, diskette drive, and PC Card activity; and status of the power
source (AC power or batteries).
Keyboard Indicators
The following icons indicate the status of the keyboard and whether the computer is in suspend mode.
Caps Lock Indicator
Press <
<
CAPS LOCK
Num Lock Indicator
Press <
<
NUM LOCK
Pad Lock Indicator
This indicator appears when the embedded keypad is
active. To activate the embedded numeric keypad, press
<FN><
cursor keys and number keys.
Scroll Lock Indicator
Press <
<
SCROLL LOCK
Suspend Mode
When all indicators are present and appear to be rolling the
computer is in suspend mode.
CAPS LOCK
> to activate this feature. Press
> again to deactivate the feature.
NUM LOCK
> to activate this feature. Press
> again to deactivate this feature.
NUM LOCK
SCROLL LOCK
>. Press <
NUM LOCK>
> to activate this feature. Press
> again to deactivate this feature.
to toggle between the
CD-ROM/Hard-Disk Drive Indicator
This indicator blinks when data is being transferred to or from the
CD-ROM or hard-disk drive.
System Overvi ew 1-3
Diskette-Drive Access Indicator
This indicator blinks when data is being transferred to or from the
internal diskette drive.
PC Card Indicator
This indicator blinks when the computer is accessing data from an
installed PC Card or Cards.
AC Power Indicator
This indicator appears when the computer is receiving power through
an AC power adapter.
If the icon is present but not blinking, the computer is on but the
•
battery is not charging.
If the icon is blinking, the computer is on and the battery is
•
charging.
Battery Activity Indicator
This indicator appears when there are batteries in the computer. If the
main battery is present, the upper triangle appears. If the secondary
battery is present, the lower tria ngle appear s. If either triangl e is bli nking, the battery is in use or charging.
Battery Status Indicato r
The battery status indicator reflects the state of the main or secondary battery in
the computer when the computer is off.
No indicator means there is no battery (main or secondary) in the computer or,
if present, the battery has been discharged.
1-4 Dell Latitude LM Systems Service Manual
The AC power indicator with the battery status in-
•
dicator means the battery is defective.
An indicator with one bar on the left means a battery is
•
too hot. Allow the battery to cool to room temperature.
The AC power indicator with the battery status in-
•
dicator and one bar means that the battery is too
hot (40° C [104° F] or more) to start charging. Charging starts automatically when the battery cools to
below 40° C.
An indicator with no bars means that battery power is
•
low (about 80 percent depleted). This is the first lowbattery indication and the computer warns the user
with three short, audible beeps. There are about
20 minutes of battery life remaining.
A blinking indicator with no bars means that battery
•
power is critically low (about 95 percent depleted) and
needs recharging. There are about 5 minutes of battery
life remaining.
An indicator with bars on the right side of the icon
•
indicates the percentage of battery life remaining.
Each bar equals 10 percent of battery life.
Battery Charge Gauge
There is a battery charge gauge on the main and secondary battery. When you press the battery test button
(labeled “PUSH”), the appropriate indicator lights up for
a few seconds to indicate the amount of charge remaining
in the battery.
P
assword
CAUTION: Dell strongly recommends that the user back up the password onto a diskette. If the user forgets the password and does not have
it on diskette, the computer cannot be accessed. In that case, the computer must be r eturn ed to De ll at the use r’ s expe nse. Dell technic ians wi ll
erase the password by shorting C146, recharge the CMOS battery, and
send the computer back at the user’s expense. For the procedure to erase
the password, see “Deleting the Password” in Chapter 4.
System Overvi ew 1-5
S
ystem Power
The power button controls power to the system. The computer receives power
from either the AC adapter connected to an AC power source or from up to two
batteries. If you use the AC adapter, constant power is available to the computer .
If you use one or two batteries, the system has built-in power management features that extend battery life by removing power from parts of the computer that
are not being used.
Power Conservation
Attach the AC power adapter to the computer, whenever possible, to conserve
battery power. When the AC adapter is attached, the battery is charged while the
computer uses AC power.
The Power Menu of the Setup program has power conservation features. When
activated, each power conservation feature turns off or slows down one or more
functions while the computer is idle. The power conservation features are as
follows:
Standby mode — To activate this feature, select the
•
option in the Power Menu of the Setup program. To d eactivate the feature, move
the cursor or pre ss any ke y on t he built-i n or ext ernal keyb oard.
Suspend mode — To activate this feature, press <FN><
•
SUSPEND TIME-OUT
pend mode is activated, the computer beeps o nce and the suspend mode indicator in
the status display panel blinks e very 4 seconds. To deactivate this feature, press any
key on the bui lt-in keyb oard.
NOTE: To conserve power when the computer is not in use, close the dis-
play. If the display is closed and an external monitor is
computer beeps one time a nd goes into suspen d mode. If the compu ter r eceives a
modem call from an external modem while the display is closed, the computer
answers the call unless it is in suspend-to-disk mode. To resume work, open the
display.
ST ANDBY TIME-OUT
> or set the
ESC
option in t he Power Me nu of th e Setup pro gram. W hen sus-
not
connected, the
Suspend-to-disk mode — To activate this feature, press <FN><A> or set the
•
SUSPEND TO DISK TIME-OUT
resume using the computer, press the power button on the built-in keyboard.
Dimming the display — To activate this feature, set the
•
option in the Power Menu of the Setup program. To increase the brightness of the dis-
play, press any key on the built-in keyboard.
Turning off the hard-disk drive — To activate this feature, set the
•
TIME-OUT
cally turns the hard-disk drive back on the ne xt time the microprocessor ac cesses the
drive.
1-6 Dell Latitude LM Systems Service Manual
option in the Power Menu of the Setup program. The computer automati-
option in t he Power Me nu of th e Setup pro gram. To
DIM MODE TIM E-OUT
HARD-DISK
I
nterrupt Assignments
Table 1-1. Interrupt Assignments
IRQ Line Used/Available
IRQ0 Generated by the system timer
IRQ1 Generated by the keyboard controller to signal that the key-
board output buffer is full
IRQ2 Cascade to second interrupt controller
IRQ3 Used by the infrared port (COM2)
IRQ4 Used by the serial port (COM1)
IRQ5 Used by the audio controller
IRQ6 Generated by the diskette drive controller to indicate that the
diskette drive requires the attention of the microprocessor
IRQ7 Used by the parallel port
IRQ8 Generated by the system RTC
IRQ9 Software redirect to INTOA
IRQ10 Reserved
IRQ11 Reserved
IRQ12 Generated by the keyboard controller to indicate that the out-
put buffer of the integrated touch pad or external PS/2 mouse
is full
IRQ13 Used by the math coprocessor on the microprocessor
IRQ14 Generated by the hard-disk drive to indicate that the drive
requires the attention of the microprocessor
IRQ15 Reserved
System Overvi ew 1-7
T
echnical Specifications
Table 1-2. Technical Specifications
Microprocessor
Microprocessor type. . . . . . . . Intel Pentium microprocessor
Microprocessor speed. . . . . . . 100 or 133 MHz
Internal cache memory. . . . . . 16 KB
External cache . . . . . . . . . . . . 256 KB
Math coprocessor . . . . . . . . . . internal to the microprocessor
Chip Set and Bus
System chip set. . . . . . . . . . . . Intel 430MX PCIset
Data bus width . . . . . . . . . . . . 64 bits
DRAM bus width . . . . . . . . . . 64 bits
Address bus width . . . . . . . . . 32 bits
Flash EPROM. . . . . . . . . . . . . 2 Mbits
PC Card
PC Card connectors . . . . . . . . two (for two type I or type II cards or one type
III card)
Cards supported . . . . . . . . . . . 3.3- and 5-V
PC Card connector size . . . . . 68 pins
Data width (maximum) . . . . . 32 bits
Memory
Architecture . . . . . . . . . . . . . . fast-page mode, two-way interleaved
Memory module capacities . . 4, 8, and 16 MB; must be installed in matched
pairs
Standard RAM . . . . . . . . . . . . 8 MB on system board
Maximum RAM. . . . . . . . . . . 40 MB
1-8 Dell Latitude LM Systems Service Manual
Table 1-2. Technical Specifications
(Continued)
Memory
(Continued)
Memory access time:
tRAC . . . . . . . . . . . . . . . . 70 ns
tCAC . . . . . . . . . . . . . . . . 20 ns
BIOS address . . . . . . . . . . . . . F000:0000
Connectors
Serial (DTE) . . . . . . . . . . . . . . one 9-pin connector; 16,550-compatible,
16-byte buffer
Parallel . . . . . . . . . . . . . . . . . . one 25-hole connector; unidirectional,
bidirectional, EPP 1.9, or ECP
Monitor . . . . . . . . . . . . . . . . . . one 15-hole connector
PS/2 keyboard/mouse . . . . . . . one 6-pin mini-DIN
Infrared . . . . . . . . . . . . . . . . . . one IrDA 1.0-compliant window
Audio . . . . . . . . . . . . . . . . . . . microphone; headphones/speaker
Audio
Audio type. . . . . . . . . . . . . . . . SoundBlasterPro-compatible voice and
music functions
Audio controller . . . . . . . . . . . ESS 1688
Conversion . . . . . . . . . . . . . . . 16 bit (stereo analog-to-digital and
digital-to-analog)
FM music synthesizer. . . . . . . 20-voice, 72-operator
Interfaces:
Internal . . . . . . . . . . . . . . . ISA bus
External. . . . . . . . . . . . . . . microphone (minijack);
headphones/speaker (minijack)
Internal speaker amplifier. . . . 0.5 W stereo
Controls. . . . . . . . . . . . . . . . . . volume can be controlled through key combina-
tions and software application menus
System Overvi ew 1-9
Table 1-2. Technical Specifications
Video
(Continued)
Video type. . . . . . . . . . . . . . . . 64-bit (128-bit hardware accelerated) PCI
Video controller . . . . . . . . . . . NeoMagic 2070
Video memory . . . . . . . . . . . . 896 KB
Active-Matrix Display
Type . . . . . . . . . . . . . . . . . . . . active-matrix color (TFT)
Dimensions:
Height . . . . . . . . . . . . . . . 184.5 mm (7.3 inches)
Width . . . . . . . . . . . . . . . . 246.0 mm (9.7 inches)
Diagonal . . . . . . . . . . . . . .
307.5 mm (12.1 inches)
Maximum resolution . . . . . . . 800 x 600 pixels; 256 colors
Refresh rate (typical) . . . . . . . 70 Hz
Response time (typical) . . . . . 60 ms
Operating angle . . . . . . . . . . . 0° (closed) to 135°
Dot pitch. . . . . . . . . . . . . . . . . 0.31 mm
Power consumption . . . . . . . . 2.35 W
Controls . . . . . . . . . . . . . . . . . brightness can be controlled through key
combinations
Dual-Scan Display
Type . . . . . . . . . . . . . . . . . . . . dual-scan color (STN)
Dimensions:
Height . . . . . . . . . . . . . . . 172.8 mm (6.8 inches)
Width . . . . . . . . . . . . . . . . 230.4 mm (9.1 inches)
Diagonal . . . . . . . . . . . . . . 287.0 mm (11.3 inches)
Maximum resolution . . . . . . . 800 x 600 pixels; 256 colors
Refresh rate (typical) . . . . . . . 70 Hz
Response time (typical) . . . . . 300 ms
Operating angle . . . . . . . . . . . 0° (closed) to 135°
1-10 Dell Latitude LM Systems Service Manual
Table 1-2. Technical Specifications
(Continued)
Dual-Scan Display
(Continued)
Dot pitch . . . . . . . . . . . . . . . . . 0.29 mm
Power consumption. . . . . . . . . 3.4 W
Controls. . . . . . . . . . . . . . . . . . brightness and contrast can be controlled
through key combinations
Keyboard
Number of keys. . . . . . . . . . . . 87 (U.S. and Canada); 88 (Europe); 89 (Japan)
Key travel . . . . . . . . . . . . . . . . 3.0 ± 0.5 mm (0.12 ± 0.02 inch)
Key spacing. . . . . . . . . . . . . . . 19.1 mm (0.75 inch)
Layout. . . . . . . . . . . . . . . . . . . QWERTY/AZERTY/Kanji
Touch Pad
Interface . . . . . . . . . . . . . . . . . PS/2-compatible
X/Y position resolutions. . . . . 20 points/mm (500 points/inch)
Size:
Thickness . . . . . . . . . . . . . 4.65 mm (0.18 inch) at highest component
Width . . . . . . . . . . . . . . . . 62.1-mm (2.4-inch) sensor-active area
Height . . . . . . . . . . . . . . . . 49.0-mm (1.9-inch) rectangle
with 0.5-mm (0.02-inch) tabs
Weight. . . . . . . . . . . . . . . . 15 g (0.52 ounce) ± 0.5 g (0.001 ounce)
Power:
Supply voltage . . . . . . . . . 5 V ± 10%
Supply current. . . . . . . . . . 4 mA (maximum operating current)
System Overvi ew 1-11
Table 1-2. Technical Specifications
Main Battery
Type . . . . . . . . . . . . . . . . . . . . lithium ion
Dimensions:
Height. . . . . . . . . . . . . . . . 22.0 mm (0.86 inch)
Depth . . . . . . . . . . . . . . . . 219.0 mm (8.62 inches)
Width . . . . . . . . . . . . . . . . 57.8 mm (2.27 inches)
Weight. . . . . . . . . . . . . . . . . . . 0.44 kg (0.97 lb)
Voltage . . . . . . . . . . . . . . . . . . 10.8 VDC
Capacity . . . . . . . . . . . . . . . . . 42 WH
(Continued)
Charge time (approximate):
1
Computer on. . . . . . . . . . . 4 hours
Computer off . . . . . . . . . . 3 hours
Operating time (approximate,
with no power management
features enabled):1 . . . . . . . . .
3 to 5 hours with one battery;
6 to 10 hours with two batteries
Life span (approximate)1 . . . .
500 discharge/charge cycles
Temperature range:
Charge . . . . . . . . . . . . . . . 0° to 40°C (32° to 104°F)
Discharge . . . . . . . . . . . . . 0° to 60°C (32° to 140°F)
Storage . . . . . . . . . . . . . . . -20° to 50°C (-4° to 122°F)
1
Battery performance featur es such as c har ge time, oper ating time , and life span can v ary according to
the conditions unde r wh ic h the co m pu te r an d ba tte r y are used.
1-12 Dell Latitude LM Systems Service Manual
Table 1-2. Technical Specifications
AC Adapter
(Continued)
Input voltage . . . . . . . . . . . . . . 90 to 264 VAC
Input current (maximum) . . . . 1.0 A at 100 VAC, full load
Input frequency. . . . . . . . . . . . 47 to 63 Hz
Output current. . . . . . . . . . . . . 2.6 A (continuous)
Output power . . . . . . . . . . . . . 34 W
Rated output voltage. . . . . . . . 16.2 VDC
Physical:
Height . . . . . . . . . . . . . . . . 27.0 mm (1.06 inches)
Width. . . . . . . . . . . . . . . . . 60.0 mm (2.36 inches)
Depth. . . . . . . . . . . . . . . . . 107.5 mm (4.23 inches)
Weight (with cables) . . . . 0.3 kg (0.66 lb)
Temperature range:
Operating . . . . . . . . . . . . . 5° to 35°C (41° to 95°F)
Storage . . . . . . . . . . . . . . . -20° to 50°C (-4° to 122°F)
Physical (Computer)
Height . . . . . . . . . . . . . . . . . . . 49.5 mm (1.95 inches)
Width. . . . . . . . . . . . . . . . . . . . 299.9 mm (11.8 inches)
Depth. . . . . . . . . . . . . . . . . . . . 228.7 mm (8.93 inches)
Weight (with hard-disk drive,
diskette drive, battery, and two
PC Card blanks):
Dell Latitude
LM P100SD . . . . . . . . . . .
3.1 kg (6.9 lb)
Dell Latitude
LM P133ST. . . . . . . . . . . .
3.1 kg (6.9 lb)
System Overvi ew 1-13
Table 1-2. Technical Specifications
Environmental (Computer)
(Continued)
Temperature:
Operating . . . . . . . . . . . . . 5° to 35°C (41° to 95°F)
Storage . . . . . . . . . . . . . . . -20° to 50°C (-4° to 122°F)
Relative humidity. . . . . . . . . . 10% to 90% (noncondensing)
Maximum vibration:
Operating . . . . . . . . . . . . . 0.51 GRMS using a random-vibration spectrum
that simulates air shipment
Storage . . . . . . . . . . . . . . . 1.1 GRMS using a random-vibration spectrum
that simulates truck shipment
Maximum shock:
2
Operating . . . . . . . . . . . . . 1.52 m/sec (4.98 ft/sec)
(less than or equal to a pulse width of 2 ms)
Storage . . . . . . . . . . . . . . . 2.03 m/sec (6.66 ft/sec)
(less than or equal to a pulse width of 2 ms)
Altitude:
Operating . . . . . . . . . . . . . 0 m to 2438 m (0 ft to 8,000 ft)
Storage . . . . . . . . . . . . . . . 0 m to 12,192 m (0 ft to 40,000 ft)
2
Measured with the hard-disk drive in head-parked position.
1-14 Dell Latitude LM Systems Service Manual
Chapter 2
Initial Procedures
his chapter describes initial procedures that can help you diagnose a com-
T
puter problem. These procedures can often reveal the source of a problem or
indicate the correct starting point for troubleshooting the computer. Dell recommends that you perform these initial procedures in the order they are presented.
I
nitial User Contact
When you first contact a user who has a problem, ask the user to describe the
problem and the conditions under which it occurs. A verbal description can
often indicate the cause of a problem or indicate the appropriate troubleshooting
procedure to use. After the user describes the problem, follow these steps:
1. Ask the user to back up any data on the hard-disk drive if the computer’s condition permits.
See the “Maintaining Your Computer” section of the online System’s User’s
Guide.
2. Ask the user to try to duplicate the problem by r epeating the operations
he or she was performing at the time the problem occurred.
Can the user duplicate the problem?
Yes. Proceed to step 3.
No. Proceed to the next section, “Visual Inspection.”
3. Observe the user to determine whether he or she is making an error,
such as typing an incorrect key combination or entering a command
incorrectly.
Is the problem a result of user error?
Yes. Instruct the user in the proper procedure or direct him or her to the
appropriate user documentation for a description of the correct procedure.
No. Proceed to the next section, “Visual Inspection.”
V
isual Inspection
The visual inspection consists of a quick inspection of the exterior of the computer and any attached peripherals, including making any necessary corrections.
For information about the proper removal and installation of computer
Initial Procedures 2-1
components, as instructed in the following procedure, see Chapter 4, “Removing and Replacing Parts.”
CAUTION: Before you proceed with the visual inspection, ensure that
the user has saved all open files and exited all open application pr ograms
if possible.
To perform a visual inspection, follow these steps:
1. Determine the power state of the computer.
If the display is on, go to step 2.
If the display is off, press any key to verify that the computer is not in sus-
pend or standby mode. Then proceed to step 2.
2. Turn off any attached peripherals, and then turn off the computer.
Then proceed to step 3.
3. Verify that the exterior of the computer is free of any obvious physical
damage.
4. If the computer is operating from an AC adapter, verify the following:
a. The AC adapter’s AC power cable is connected to both the AC adapter
and the wall outlet. The AC adapter’s LED should be on.
b. The AC adapter’s DC power cable is properly connected to the com-
puter’s AC adapter connector.
c. The AC adapter and cables are free of any obvious physical damage.
5. If the computer is operating from battery power, remove any installed
batteries, verify that they are free of any obvious physical damage, and
then reinsert the batteries into their respective compartments. Press the
test button located on each battery to see if there is a charge.
6. Remove the diskette drive (if installed), verify that it is free of any obvious physical damage, and then reinsert the drive into its compartment.
7. Remove any installed PC Cards from the PC card slot, verify that they
are free of any obvious physical damage, and then reinsert the card(s)
into the PC card slot.
8. If there is a memory area problem and the computer has memory modules, remove the memory modules from the main board, verify that
they are free of any obvious physical damage, and then reinstall the
modules.
9. Open the computer, and verify that it is free of any obvious physical
damage.
10. Verify that the keyboard is free of any obvious physical damage and
that its keys operate freely.
11. Verify that the touch pad and its associated buttons operate freely.
2-2 Dell Latitude LM Systems Service Manual
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