Chapter 4 Troubleshooting - HP Visualize J2240 Service Handbook

Troubleshooting
This chapter provides information about isolating a failing component, known as a
Field Replaceable Unit (FRU), in a J Class workstation.
To troubleshoot a J Class workstation, you must be familiar with the HP-UX operat-
ing system and be able to start and stop processes. You should also be familiar with
the boot ROM diagnostics, ISL diagnostics, and the Support Tools Manager online
tests, which we describe in this chapter.
Note any error or status messages, then run the power-up boot ROM diagnostics,
known as Self Test. If the Self Test diagnostics fail, replace the FRU that is indicated.
If the tests pass but you still suspect a problem, run the ISL diagnostics and the Sup-
port Tools Manager online tests.
For a complete description of using ISL diagnostics and using the Support Tools
Manager, see the Precision Architecture RISC: HP 9000 Series 700 Diagnostics
Manual (HP Part Number 92453–90010).
First check that the power LED on the front of the system unit lights. If the LED
doesn't light, follow the instructions in the flowchart in Figure 4–1. If the LED lights,
follow the instructions in the flowchart in Figure 4–2 to isolate a failing Field
Replaceable Unit (FRU).
NOTICE: The motherboard 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 motherboard.
NOTICE: On the J280, there are three fans on the CPU board
and system board assembly. These fans are connected
to a fan failure detect circuit. If any of the fans fail,
power is shut down within ten seconds of the fan
failure.
NOTICE: On the J282 and J2240, there are five fans total.
Three on the CPU board and system board assembly.
One for the EISA board and one for the power
supply. These fans are connected to a fan failure
detect circuit. If any of the fans fail, power is shut
down within ten seconds of the fan failure.
4
Troubleshooting 4–1