Troubleshooting; Introduction; The Troubleshooting Process; Materials Required - HP 9000 Series 310 Service Information Manual

Chapter 5
Troubleshooting
Introduction
The Troubleshooting Process
Troubleshooting c.omputer systems c.an be defined as a proc.ess of answering these five questions:
• What exac.tly is wrong, or what are the bad symptoms?
• Where are the bad symptoms appearing?
• When do the bad symptoms oc.c.ur?
• How bad is the problem or to what extent does it oc.c.ur?
• After the immediate problem is solved, what c.aused it to happen?
Getting the answers to these questions usually makes the troubleshooting proc.ess muc.h more
effec.tive and less c.ostly. When a failure in one of these c.omputer system oc.c.urs, remember these
questions and get the answers to eac.h of them. After you have all answers possible, determine
what c.ould be the most probable c.ause of the problem. Sometimes you will arrive at several
c.hoic.es for a c.ause. For eac.h c.hoic.e, qualify it against the answers to the questions above. The
most probable c.ause is the one that explains why the answers to these questions are what they
are.
Materials Required
Several items are required to troubleshoot the HP Series 300 Computer and HP 98568A Bus
Expander to the failed assembly:
• Series 300 Computer and HP 98568A Bus Expander Servic.e Handbook
• Series 200/300 Test Tools Manual and Test Disc.s.
• Digital Voltmeter.
• Anti-Static. Workstation.
Test LED Displays
Eight test LEDs are loc.ated behind the front panel and are visible from the front of the c.omputer.
In this manual, the LED's are shown in the following c.ontext:
LED On •
LED Off 0
Troubleshooting
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