Dell Latitude LM - Manual (Page 54)

3-20 Dell Latitude LM Reference and Troubleshooting Guide
5. Insert your diagnostics diskette into drive A,
reboot the computer, and run the Serial/Infrared
Ports Test Group and/or the Parallel Ports Test
Group in the Dell diagnostics. (See Chapter 4,
“Running the Dell Diagnostics.”)
The Serial/Infrared Ports Test Group and the Parallel
Ports Test Group check the basic functions of the
system board’s I/O port logic. Also, if a parallel
printer is connected to the parallel port, the Parallel
Ports Test Group tests the communication link
between the system board’s I/O port logic and the
printer.
Do the tests complete successfully?
Yes. Go to step 6.
No. Call Dell for technical assistance. (See Chap-
ter 5, “Getting Help,” for instructions.)
6. If the problem persists, go to “Troubleshooting a
Parallel Printer” or “Troubleshooting a Serial
I/O Device” found later in this chapter.
Troubleshooting a Parallel Printer
If the preceding procedure, “Troubleshooting the Basic
I/O Functions,” indicates that the problem is with a paral-
lel printer, use the following procedure:
1. Turn off the parallel printer and computer.
2. Swap the parallel printer’s interface cable with a
known working cable.
3. Turn on the parallel printer and computer.
4. Attempt a print operation on the parallel printer.
Does the print operation complete successfully?
Yes. You probably need a new interface cable. Call
Dell for technical assistance. (See Chapter 5, “Get-
ting Help,” for instructions.)
No. Go to step 5.
5. Run the parallel printer’s self-test.
Does the self-test complete successfully?
Yes. Go to step 6.
No. The printer is probably defective. If you bought
the printer from Dell, call Dell for technical assis-
tance. (See Chapter 5, “Getting Help,” for
instructions.) If you purchased the printer elsewhere,
take it to one of the manufacturer’s authorized ser-
vice centers for repair.
6. Attempt another print operation on the parallel
printer.
Does the print operation complete successfully?
Yes. The problem is resolved.
No. Call Dell for technical assistance. (See Chap-
ter 5, “Getting Help,” for instructions.)
Troubleshooting a Serial I/O Device
If the procedure titled “Troubleshooting the Basic I/O
Functions” found earlier in this section indicates that the
problem is with a device connected to one of the serial
ports, use the following procedure:
1. Save any open application programs, and then
turn off the computer and the serial device.
2. Swap the device’s interface cable with a known
working cable.
3. Turn on the computer and the serial device.
Is the problem resolved?
Yes. You probably need a new interface cable. Call
Dell for technical assistance. (See Chapter 5, “Get-
ting Help,” for instructions.)
No. Go to step 4.
4. Turn off the computer and the serial device, and
swap the device with a comparable working
device.
For example, if your serial mouse has a problem,
swap it with a serial mouse you know is working
properly.
5. Turn on the computer and the serial device.
Is the problem resolved?
Yes. You probably need a new device. Call Dell for
technical assistance. (See Chapter 5, “Getting Help,”
for instructions.)
No. Call Dell for technical assistance. (See Chap-
ter 5, “Getting Help,” for instructions.)