Troubleshooting - HP 330 Service Handbook

Troubleshooting
4
Analytic Troubleshooting
Troubleshooting computers is the process of getting answers to these
five questions:
• What exactly is wrong, or what are the bad symptoms?
• Where are the bad symptoms appearing?
• When do the bad symptoms occur?
• How bad is the problem or to what extent does it occur?
• What actually caused the problem in the first place?
Getting the answers to these questions usually makes the troubleshoot-
ing process much more effective and less costly. When a failure in a
computer system occurs, remember these questions and get the answers
to each of them.
After you have all answers possible, decide what's the most probable
cause of the problem. Sometimes you'll arrive at several choices for a
cause. For each choice, qualify it against the answers to the questions
above. The most probable cause is the one that logically justifies the
correct answers to these questions.
Troubleshooting 35