HP 300

Table 5-1. Computer/Bus Expander Troubleshooting Procedures
Procedure
Inoperative Unit
Live Unit
Functional Unit
What MUST Function
Nothing
Power
Supply
Motherboard
Computer:
Power Supply
Part of processor
Part of motherboard
Top 16K of RAM
DIO Bus
Some inputs from keyboard
Output to operate monitor
Bus Expander:
Power
Supply
Part of motherboard
One accessory/I/O card
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 fans or LED's aren't working, go to the Inoperative Unit Procedure. If they do
work, go
to the Functional Unit Procedure.
Troubleshooting
105
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