JHL90 Service Manual
The purpose of this chapter is to provide a systematic method of isolating
problems you may have with the JHL90 series Notebook Computer. We assume
that you have a basic understanding of DOS-based computer systems as well as
knowledge of standard troubleshooting procedures. This manual is written under
the assumption that the problems are indeed related with Notebook itself. The
improper usage and application software problems are excluded in this chapter.
The system BIOS Beep Code is an integrated unit to detect some errors in the
system board. This beep code will give immediate identification of certain system
board problems. If the troubleshooting procedure is followed step by step, it can
efficiently isolate the problem and the problem can be solved easily.
1. PERFORM VISUAL INSPECTION
Check the following:
• Power cords are properly connected and secured
• Power supply is adequate for operation
• There are no obvious shorts or opens
• There are no obviously burned or heated components
• All components appear normal
2. Troubleshooting Flowchart
Use the flowchart in Figure 6-1 as a guide for determining which troubleshooting
procedures to execute. Before going through the flowchart steps, verify the
following:
• Ask the user if a password is registered and, if it is, ask him or her to enter the
password.
• Verify with the customer that VISTA32 is installed on the hard disk.
Operating systems that were not preinstalled by Compal can cause the
computer to malfunction.
• Make sure all optional equipment is removed from the computer.
• Make sure the floppy disk drive is empty.
6-1
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