Texas Instruments Extensa 450 Series, Maintenance Manual

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5
Troubleshooting Procedures
5.1
General
This section provides the following information:
•
Overview of the fault isolation process
•
Guidelines for isolating computer malfunctions to replaceable subassemblies
•
Instructions for executing diagnostics and interpreting error messages.
5.2
Overview of Fault Isolation Process
The fault isolation process (summarized in Figure 5-1) consists of the following:
•
Quick Check of the following:
•
Notebook power system (including battery packs and AC Adapter
connections)- See Paragraph 5.4.
•
Switch settings (ensure Power switch is On, and press Standby
switch to ensure that Notebook is not in Standby mode; press Shift
to ensure the notebook is not in Auto-Suspend mode.
•
All external cabling (if any)
•
Check LCD Contrast adjustment (Dual Scan version only)
•
Record and attempt to resolve any displayed error messages/LED indications
(See Paragraph 5.3 and Table 5-1)
Record and attempt to resolve any series of beeps emitted from the notebook
indicating test failure (See Table 5-2)
Troubleshooting 5-1