Dell Latitude LM - Manual (Page 76)

4-20 Dell Latitude LM Reference and Troubleshooting Guide
Subtests
The four subtests in the Parallel Ports Test Group confirm
the following port functions:
• Parallel Internal Test
Checks several internal functions of the parallel port
• Parallel External Loopback Test
Tests the functionality of the control lines through an
external loopback connector, if an external loopback
connector is available
• Parallel External Interrupt Test
Tests the parallel port’s ability to generate interrupts
from all possible sources, if an external loopback
connector is available
• Parallel Printer Pattern Test
Tests whether the port(s) can retain data, print text
on a printer, and generate interrupts
S
CSI Devices Test Group
The subtests in the SCSI Devices Test Group check the
functionality of the small computer system interface
(SCSI) controller in the Dell Latitude Advanced Port
Replicator and the SCSI devices attached to it.
NOTE: The SCSI Devices Test Group does not apply to
the Dell Latitude LM.
N
etwork Interface Test Group
The subtests in the Network Interface Test Group verify
the basic operation of the network interface controller in
the Dell Latitude Advanced Port Replicator. They test the
controller’s internal functions, including read and write
access to its registers and internal transmit and receive
(loopback) capability.
NOTE: The Network Interface Test Group does not apply
to the Dell Latitude LM.
A
udio Test Group
The subtests in the Audio Test Group check the functions
of the audio controller and the computer’s recording and
playback features.
Why Run an Audio Test?
If you do not hear sounds from your built-in speakers
when you expect to, it is possible that your operating
system or sound application uses resource settings differ-
ent than those of the audio controller in the computer. In
the absence of an expected sound, first check the docu-
mentation that accompanied your operating system or
sound application to see if the sound features are cor-
rectly configured to work with the computer. The default
resource settings for the audio controller are:
• DMA channel: 1
• IRQ line: 5
• Port address: 220h
If necessary, change the resource settings in your operat-
ing system or sound application to match these default
settings.
If you still do not hear sound when you expect to, run the
Audio Test Group.
NOTE: Before running the Audio Test Group, make sure
to enable the built-in speaker(s), and make sure that the
speaker volume has not been muted.
Subtests
The 11 subtests in the Audio Test Group confirm the fol-
lowing functions:
• Software Reset Test
Checks for the presence of an active audio controller
in your system
• Compatibility ID Test
Determines if the correct sound controller is installed
for your system
• Interrupt Test
Checks to see if the audio controller is generating an
interrupt on the IRQ line configured for that
controller