HP Model 712/100 hp 9000 series 700 model 712 service handbook (a2615-90039) - Page 60

Troubleshooting

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Troubleshooting 4 This chapter provides information about isolating a failing component, known as a Field Replaceable Unit (FRU), in a Model 712 workstation. To troubleshoot a Model 712 workstation, you must be familiar with the operating system and be able to start and stop processes. You should also be familiar with the boot ROM diagnostics, ISL diagnostics, and the SupportWave online tests, which we describe in this chapter. To troubleshoot the Model 712 workstation, first check that the power LED on the front of the system unit comes on. If the LED doesn't light, follow the instructions in the flowchart in Figure 4-1. If the LED comes on, follow the instructions in the flowchart in Figure 4-2 to isolate a failing Field Replaceable Unit (FRU). NOTICE: The CPU board contains a surface-mount fuse that fuses +5 volts from the system to the keyboard. This fuse (1) blows if an overvoltage occurs and (2) protects the system if the keyboard is shorted. Therefore, if the keyboard fails a diagnostic or won't function, replace the keyboard and the CPU board. Troubleshooting 4-1

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Troubleshooting
4–1
Troubleshooting
4
This chapter provides information about isolating a failing component, known as a
Field Replaceable Unit (FRU), in a Model 712 workstation.
To troubleshoot a Model 712 workstation, you must be familiar with the operating
system and be able to start and stop processes. You should also be familiar with the
boot ROM diagnostics, ISL diagnostics, and the SupportWave online tests, which we
describe in this chapter.
To troubleshoot the Model 712 workstation, first check that the power LED on the
front of the system unit comes on. If the LED doesn’t light, follow the instructions in
the flowchart in Figure 4–1. If the LED comes on, follow the instructions in the
flowchart in Figure 4–2 to isolate a failing Field Replaceable Unit (FRU).
NOTICE:
The CPU board contains a surface–mount fuse that
fuses +5 volts from the system to the keyboard. This
fuse (1) blows if an overvoltage occurs and (2) pro-
tects the system if the keyboard is shorted. Therefore,
if the keyboard fails a diagnostic or won’t function,
replace the keyboard and the CPU board.