Lenovo 3000 N100 0689 Hardware Maintenance Manual

Also see for 3000 N100: Hardware Maintenance Manual Brochure & specs Brochure Install guide Setup poster

Contents

Intermittent problemsIntermittent system hang problems can be due to a variety of causes that havenothing to do with a hardware defect, such as cosmic radiation, electrostaticdischarge, or software errors. FRU replacement should be considered only when aproblem recurs.When analyzing an intermittent problem, do the following:1. Run the diagnostic test for the system board in loop mode at least 10 times.2. If no error is detected, do not replace any FRUs.3. If any error is detected, replace the FRU shown by the FRU code. Rerun thetest to verify that no more errors exist.Undetermined problemsIf the diagnostic tests did not identify the adapter or device that has failed, ifwrong devices are installed, or if the system simply is not operating, follow theseprocedures to isolate the failing FRU (do not isolate FRUs that have no defects).Verify that all attached devices are supported by the computer.Verify that the power supply being used at the time of the failure is operatingcorrectly. (See “Power system checkout” on page 27.)1. Turn off the computer.2. Visually check each FRU for damage. Replace any damaged FRU.3. Remove or disconnect all of the following devices:a. Non-Lenovo 3000 devicesb. Devices attached to the port replicatorc. Printer, mouse, and other external devicesd. Battery packe. Hard disk drivef. External diskette drive or optical driveg. DIMMh. Optical disk or diskette in the internal drivei. PC Cards4. Turn on the computer.5. Determine whether the problem has been solved.6. If the problem does not recur, reconnect the removed devices one at a timeuntil you find the failing FRU.7. If the problem remains, replace the following FRUs one at a time (do notreplace a nondefective FRU):a. System boardb. LCD assemblySymptom-to-FRU index42 MT 0689, 0690, and 0768