Service manual

Running the Dell Diagnostics: Dell Latitude CP
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
SCSI Devices Test Group
The subtests in the SCSI Devices test group check the functionality of the small computer
system interface (SCSI) controller in the C/Port APR or C/Dock Expansion Station, and the
SCSI devices attached to either. These tests run only if the computer is docked.
NOTES: Before conducting these subtests on an external SCSI CD-ROM drive,
insert into the drive a CD with audio and data tracks (such as a multimedia CD). The
Audio Output Test requires a CD with audio tracks; all other subtests require a CD
with data tracks.
If the external CD-ROM drive is empty, or if it contains a CD that does not have the
required data or audio tracks, the subtest fails.
Why Run a SCSI Devices Test?
If you check your SCSI hard-disk drive to determine the amount of available space, your
operating system will probably report problem areas. Problem areas on hard-disk drives are
common, because most hard-disk drives have a small amount of space that is not usable. The
hard-disk drive keeps a record of this space so that your computer will not attempt to use it.
Identification of unusable disk space, unless it is an unusually large amount (over five percent
of the possible total), should not be regarded as a cause for testing the hard-disk drive.
These are the most common symptoms that might prompt you to test a SCSI device:
A SCSI hard-disk drive fails during the boot routine.
Seek errors are reported by the operating system or application programs.
An error message appears on the screen stating that the computer cannot read from or
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