Troubleshooting Procedures; Vorkstation Level; Spu Troubleshooting - HP 340 Series Service Manual

Troubleshooting Procedures
Workstation Level
Workstation troubleshooting consists of finding out what part of it is not working correctly. A
Model 340 Workstation consists of the SPU and its installed peripherals, power source, and the
users. Each of these elements is subject to the environment which includes, physical, electrical,
and human factors.
When part or all of the workstation fails, your initial activity should be finding the part that
has the problem. One of the best things to do first is to talk to the users and ask them to
give specific information on what they were doing when the workstation, or part of it, failed.
You may have to duplicate their activities in order to make the failure occur. If the failure is
intermittent, this process may take some time.
An important part of troubleshooting is to get the workstation
III
a mininlum working
configuration that shows the failure symptoms.
Running tests on the workstation can also be helpful. A test is nothing more than a specific
action with the system that should result in a specific response. Simple tests are nothing more
than typing in simple instructions on the keyboard and executing them. A command to print
or plot specific data is an example. Mass storage, graphics, or other functions can be checked
in the same way. These type of tests are called Quick Checks.
For quick checks, the HP 98613D Series 300 BASIC 5.2 operating systenl may be used. It allows
short booting time, easy prograrnming, and can serve as a test tool to check the workstation.
After determining what part, or product, of the system is failing, the next step is to find out
what part of the product is causing the problem. In this case, it is assumed that the SPU has
the problem. The rest of this chapter covers troubleshooting the SPU.
SPU Troubleshooting
Three levels of troubleshooting the SPU is explained. For each level different portions of the
SPU must be operational. A summary of these levels and what must be operational is shown
in Table 5-1.
In order to choose the best approach to start with, obtain as much information as possible from
the user. If the unit is not working at all, the Inoperative Unit Procedure is a good place to
start. If the user indicates that most of the unit is operating properly, the Functional Unit
Procedure rnay be a good place to start. If the users information is not conclusive, use the
following procedure to determine the problem area:
1. Turn the unit on and check for fan and Self-Test LED operation.
2. If the fan or LED's aren't working, go to the Inoperative Unit Procedure. If they do
work, go to the Functional Unit Procedure.
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Troubleshooting