HP Portable 486 Compaq Portable 486c Personal Computer Maintenance and Service - Page 9

Problem Isolation Flowchart

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1. Disconnect the AC power. 2. Disassemble the computer to reach the I/O board (refer to Chapter 5). 3. Locate the power on password switch (SW5) on the I/O board; set the switch to ON (Figure 2-1). 4. Reconnect AC power. 5. Turn on the computer and allow it to complete POST. 6. Turn the computer off. 7. Set switch SW5 to OFF. 8. Disconnect AC power. 9. Reassemble the computer (refer to Chapter 5). 10. Reconnect the AC power. 11. Turn on the computer and allow it to complete POST. If the key icon (o--m) does not appear when POST completes, the power on password has been cleared. Chapter 2.4 Problem Isolation Flowchart The problem isolation flowchart provides a quick reference for identifying and correcting problems that may occur during POST. The flowchart gives troubleshooting procedures for identifying malfunctions. It also directs you to the Diagnostics chapter in the SUPPORT SOFTWARE MAINTENANCE AND SERVICE GUIDE and to Chapter 3, "Error Messages and Codes," for more detailed

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1. Disconnect the AC power.
2. Disassemble the computer to reach the I/O board (refer to Chapter 5).
3. Locate the power on password switch (SW5) on the I/O board; set the
switch to ON (Figure 2-1).
4. Reconnect AC power.
5. Turn on the computer and allow it to complete POST.
6. Turn the computer off.
7. Set switch SW5 to OFF.
8. Disconnect AC power.
9. Reassemble the computer (refer to Chapter 5).
10. Reconnect the AC power.
11. Turn on the computer and allow it to complete POST. If the key icon
(o--m) does not appear when POST completes, the power on password has
been cleared.
Chapter 2.4 Problem Isolation Flowchart
The problem isolation flowchart provides a quick reference for identifying
and correcting problems that may occur during POST. The flowchart gives
troubleshooting procedures for identifying malfunctions. It also directs you
to the Diagnostics chapter in the SUPPORT SOFTWARE MAINTENANCE AND SERVICE
GUIDE and to Chapter 3, "Error Messages and Codes," for more detailed