Dell Inspiron Lm Service Guide

							System Overview 1-11
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
To u c h  P a d
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)
Table 1-2.  Technical Specifications (Continued)  
						

							1-12 Dell Latitude LM Systems Service Manual
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
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)
1Battery performance features such as charge time, operating time, and life span can vary according to 
the conditions under which the computer and battery are used.
Table 1-2.  Technical Specifications (Continued)  
						

							System Overview 1-13
AC Adapter
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)
Table 1-2.  Technical Specifications (Continued)  
						

							1-14 Dell Latitude LM Systems Service Manual
Environmental (Computer)
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)
2Measured with the hard-disk drive in head-parked position.
Table 1-2.  Technical Specifications (Continued)  
						

							Initial Procedures 2-1
Chapter 2
Initial Procedures
T
his chapter describes initial procedures that can help you diagnose a com-
puter problem. These procedures can often reveal the source of a problem or 
indicate the correct starting point for troubleshooting the computer. Dell recom-
mends that you perform these initial procedures in the order they are presented.
Initial 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 com-
puter’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 repeating the operations 
he or she was performing at the time the problem occurred.
Can the user duplicate the problem?
Ye s.  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?
Ye s.  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.”
Visual Inspection
The visual inspection consists of a quick inspection of the exterior of the com-
puter and any attached peripherals, including making any necessary corrections. 
For information about the proper removal and installation of computer  
						

							2-2 Dell Latitude LM Systems Service Manual
components, as instructed in the following procedure, see Chapter 4, “Remov-
ing and Replacing Parts.” 
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 obvi-
ous 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 mod-
ules, 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.CAUTION:  Before you proceed with the visual inspection, ensure that
the user has saved all open files and exited all open application programs
if possible. 
						

							Initial Procedures 2-3
12. If an external monitor is connected, verify the following: 
a. The monitor’s interface cable is properly attached to the external-
monitor connector on the computer’s I/O panel.
b. The monitor’s power cable is attached to a power source and is free of 
any obvious physical damage.
c. The monitor and its interface cable are free of any obvious physical 
damage.
d. The monitor’s controls are set according to the instructions in the docu-
mentation for the monitor.
13. If an external mouse is connected, verify the following:
a. The mouse is properly connected to the keyboard/keypad/mouse con-
nector on the computer’s I/O panel.
b. The mouse and its cable are free of any obvious physical damage.
c. The mouse’s ball and pushbuttons operate freely.
14. For any attached serial or parallel devices, verify the following:
a. The device’s interface cable connector is correctly attached to the appro-
priate port connector on the computer’s I/O panel.
b. The captive screws that secure the connectors at each end of the inter-
face cable are secure enough to ensure a firm connection.
c. The attached device and its interface cable are free of any obvious phys-
ical damage.
15. Turn on any attached peripherals and then the computer.
Does the problem recur?
Ye s.  Proceed to the next section, “Observing the Boot Routine.”
No.  No further steps are necessary.
Observing the Boot Routine
After you perform a visual inspection as described in the previous section, boot 
the computer from a diagnostics diskette and, while the boot routine is running, 
observe the computer for any indications of problems.
NOTE:  To prevent possible damage to the original diagnostics diskette, always 
use a backup copy of the diagnostics diskette when servicing a user’s computer.  
Dell recommends that users make copies of the Dell Diagnostics Diskette. For 
instructions, see “Before You Start Testing” in Chapter 4 of the Dell Latitude LM Refer-
ence and Troubleshooting Guide.
To observe the boot routine, follow these steps:
1. Turn off the computer and any attached peripherals.
2. Insert a diagnostics diskette into the diskette drive. Turn on all periph-
erals and then the computer. 
						

							2-4 Dell Latitude LM Systems Service Manual
3. Watch the indicators at the top of the keyboard. Depending on how 
your computer is configured, after various indicators flash momen-
tarily in the status display panel, some indicators should light up and 
remain on.
Do these indicators light up within seconds after the boot routine starts?
Ye s .  Proceed to step 4.
No.  Troubleshoot the power subsystem.
4. While the boot routine is running, observe the computer for any of the 
following:
•Diskette-drive and hard-disk drive access indicator activity
These indicators light in response to data being transferred to or from the drives. If 
either of these indicators fails to light during the boot routine, troubleshoot the 
diskette drive or hard-disk drive subsystem, as appropriate.
•System error messages
These messages can indicate problems or provide status information.  If a system 
error message is displayed, refer to Table 3-2. 
•Beep codes
A beep code is a series of beeps that indicates an error condition.  If the computer 
emits a beep code, refer to Table 3-1.
NOTE:  The computer beeps once shortly after the system boots. This beep 
is normal and not part of a beep code. 
•Any unusual sounds
5. Observe the display for the Diagnostics Menu of the Dell diagnostics.
Does the Diagnostics Menu appear on the display?
Ye s .  See “Running the Dell Diagnostics” in Chapter 3.
No.  Proceed to step 6.
6. Insert another copy of the diagnostics diskette into the diskette drive, 
and reboot the computer.
Does the Diagnostics Menu appear on the display?
Ye s .  See “Running the Dell Diagnostics” in Chapter 3.
No.  Proceed to the next section, “Eliminating Resource Conflicts.” 
						

							Initial Procedures 2-5
Eliminating Resource Conflicts
Devices within or connected to the computer may require dedicated memory 
spaces, interrupt levels, and/or DMA channels. Because different devices can be 
configured at different times, it is possible the same resource is assigned to two 
or more devices.
Disconnect all peripherals and remove all PC Cards to make sure that the com-
puter failure is not caused by faulty devices.
If you suspect that resource conflicts might exist, check the computer and reas-
sign the resources as necessary. For more information about resolving conflicts, 
see Chapter 3, “Troubleshooting Your Computer,” in the Reference and Trouble-
shooting Guide.
Getting Help
If none of the procedures in this chapter reveal the source of the problem or lead 
to the proper troubleshooting steps for determining the source of the problem, 
contact Dell for technical assistance. For instructions, see Chapter 5, “Getting 
Help,” in the Reference and Troubleshooting Guide or the “Contacting Dell” section 
of the online System User’s Guide. 
						

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