Dell Latitude LM Reference And Troubleshooting Manual

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Dell Latitude LM Reference And Troubleshooting Manual Manual pdf 54 page image

3-20 Dell Latitude LM Reference and Troubleshooting Guide5. Insert your diagnostics diskette into drive A,reboot the computer, and run the Serial/InfraredPorts Test Group and/or the Parallel Ports TestGroup in the Dell diagnostics. (See Chapter 4,“Running the Dell Diagnostics.”)The Serial/Infrared Ports Test Group and the ParallelPorts Test Group check the basic functions of thesystem board’s I/O port logic. Also, if a parallelprinter is connected to the parallel port, the ParallelPorts Test Group tests the communication linkbetween the system board’s I/O port logic and theprinter.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 aParallel Printer” or “Troubleshooting a SerialI/O Device” found later in this chapter.Troubleshooting a Parallel PrinterIf the preceding procedure, “Troubleshooting the BasicI/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 aknown 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. CallDell 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 boughtthe printer from Dell, call Dell for technical assis-tance. (See Chapter 5, “Getting Help,” forinstructions.) 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 parallelprinter.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 DeviceIf the procedure titled “Troubleshooting the Basic I/OFunctions” found earlier in this section indicates that theproblem is with a device connected to one of the serialports, use the following procedure:1. Save any open application programs, and thenturn off the computer and the serial device.2. Swap the device’s interface cable with a knownworking cable.3. Turn on the computer and the serial device.Is the problem resolved?Yes. You probably need a new interface cable. CallDell 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, andswap the device with a comparable workingdevice.For example, if your serial mouse has a problem,swap it with a serial mouse you know is workingproperly.5. Turn on the computer and the serial device.Is the problem resolved?Yes. You probably need a new device. Call Dell fortechnical assistance. (See Chapter 5, “Getting Help,”for instructions.)No. Call Dell for technical assistance. (See Chap-ter 5, “Getting Help,” for instructions.)