Dell PowerEdge 4300 Dell PowerEdge 4300 Systems Installation and Troubleshooti - Page 74

Diskette, Drives, Serial/Infrared Ports, Serial/Infrared Baud Rate Test, Serial/Infrared Interrupt

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A command that is typed in an incorrect form (usually called a syntax error) is another possible cause of diskette drive problems. Be sure you have entered the command in the proper form. If the diskette(s) and command syntax are eliminated as causes, the following symptoms usually suggest a drive problem and warrant running a subtest in the Diskette Drives test group: An error message appears on the screen stating that the computer cannot read from or write to a diskette. A diskette cannot be properly formatted, or format error messages appear on the screen. Data on diskettes is corrupted or lost; these problems may be intermittent. The subtests in the Serial/Infrared Ports test group check the computer's interface with external devices, such as a printer and a mouse, that are connected to the computer through a serial or infrared port. The subtests in this test group are not intended as a diagnostic test for the actual peripheral attached to each port. NOTES: With certain modems installed, the subtests in the Serial/Infrared Ports test group may fail because the modem appears to the diagnostics as a serial or infrared port, but it cannot be tested as a serial or infrared port. If a modem is installed and one of the subtests in the Serial/Infrared Ports test group fails, remove the modem and run the diagnostic tests again. If an external loopback connector is not attached to a serial or infrared port, the Serial External Transmission Test will fail for that port and the results of this test should be ignored. An external modem connected to the port does not substitute for an external loopback connector. The four subtests in the Serial/Infrared Ports test group and the port functions they test follow: Serial/Infrared Baud Rate Test Checks the baud rate generator in each serial communications chip against the computer's clock Serial/Infrared Interrupt Test Checks the serial port's ability to send IRQs to the microprocessor Serial/Infrared Internal Transmission Test Checks several internal functions of the serial port using the internal loopback mode of the serial communications chip 5-20 Dell PowerEdge 4300 Systems Installation and Troubleshooting Guide

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5-20
Dell PowerEdge 4300 Systems Installation and Troubleshooting Guide
A command that is typed in an incorrect form (usually called a
syntax
error) is another
possible cause of diskette drive problems. Be sure you have entered the command in
the proper form.
If the diskette(s) and command syntax are eliminated as causes, the following symp-
toms usually suggest a drive problem and warrant running a subtest in the
Diskette
Drives
test group:
²
An error message appears on the screen stating that the computer cannot
read
from or
write
to a diskette.
²
A diskette cannot be properly formatted, or format error messages appear on the
screen.
²
Data on diskettes is corrupted or lost; these problems may be intermittent.
6HULDOÀ,QIUDUHG±3RUWV±7HVW±*URXS
The subtests in the
Serial/Infrared Ports
test group check the computer’s interface
with external devices, such as a printer and a mouse, that are connected to the com-
puter through a serial or infrared port. The subtests in this test group are not intended
as a diagnostic test for the actual peripheral attached to each port.
NOTES: With certain modems installed, the subtests in the
Serial/Infrared Ports
test
group may fail because the modem appears to the diagnostics as a serial or infrared
port, but it cannot be tested as a serial or infrared port. If a modem is installed and
one of the subtests in the
Serial/Infrared Ports
test group fails, remove the modem
and run the diagnostic tests again.
If an external loopback connector is not attached to a serial or infrared port, the
Serial
External Transmission Test
will fail for that port and the results of this test should be
ignored. An external modem connected to the port does not substitute for an external
loopback connector.
6XEWHVWV
The four subtests in the
Serial/Infrared Ports
test group and the port functions they
test follow:
²
Serial/Infrared Baud Rate Test
Checks the baud rate generator in each serial communications chip against the
computer’s clock
²
Serial/Infrared Interrupt Test
Checks the serial port’s ability to send IRQs to the microprocessor
²
Serial/Infrared Internal Transmission Test
Checks several internal functions of the serial port using the internal loopback
mode of the serial communications chip