Inoperative Unit Procedure - HP 340 Series Service Manual

Workstation's spu
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Table 5-1. SPU Troubleshooting Procedures
Procedure
What MUST Function
Inoperative Unit
Nothing
Live Unit
Power Supply
Functional Unit
Power Supply
Part of CPU circuits
Part of interfaces
Top 16K of RAM
Some inputs from keyboard
Video to operate monitor
Inoperative Unit Procedure
An Inoperative Unit is one which does not appear to function at all. No power-on or self-test
LEDs, fan rotation, or response to keyboard inputs are typical symptorus. Nearly all inoperative
units have one of these problems:
• Defective power supply.
• Voltage select connector in wrong position.
• Improper line voltage/frequency or defective power cord.
Follow this procedure to isolate the problem. If an assembly is defective, this procedure indicates
which asserubly should be replaced to eliminate the problem.
WARNING
Hazardous voltages are present in the SPU when it is plugged in. Turn
the unit off and unplug the SPU before placing test leads, checking
fuses, or removing/installing assemblies.
1. Check that the voltage select swith is correctly set. Refer to Chapter 3 in this manual or
Chapter 2 in the Service Handbook for the correct procedures.
2. See if the power supply output voltages are correct. If they aren't, replace the power
supply.
3. If the fan is not rotating, replace the power supply.
Troubleshooting
85

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