HP 330 Service Information Manual page 173

6. Repeat steps 4 and 5 until the board or card passes self-test. If the assembly does not
pass self-test, either it or the bus expander is defective. In this case, repeat steps 6 and
7 using another board or card.
Before you can proceed further, the minimum configuration must work. If this configuration
works, then you can proceed to the next level, Functional Unit Troubleshooting.
Functional Unit Troubleshooting
A functional unit is one that passes the minimum configuration test. It doesn't have to function
properly, but at least start the self-test and light the LEDs for the computer. For the bus
expander, one accessory card must at least pass self-test.
For the computer to pass the minimum computer configuration functions correctly, the LED's
should end up as:
o
0 0 0 0
0 00
Once the computer n1inimum configuration self-test passes, you're ready to start testing with
an Interrnediate Configuration.
Intermediate Configuration
You may configure the computer several ways for intermediate level troubleshooting in Func-
tional Unit procedures. A good place to start is by having memory configured to address at the
top of RAM. This will verify that more of the processor board is working. The procedures are:
1. Turn off the computer, unplug it, and reconnect the ribbon cables to the backplane.
2. Install a nlemory board (without systenl bus on a Model 350) configured for the top of
RAM.
3. Plug the computer in, turn it on and watch the LED's go through self-test.
4. If the LED pattern is correct, skip to Step 6.
If the pattern is incorrect, either the backplane or the processor is bad. Power down and
relocate the memory board in another system slot, then retest. If necessary, run the test
with the memory board in each system slot.
5. If the LED pattern is correct, skip to Step 6. If the pattern is incorrect, either motherboard
or processor is bad. Replace each one and retest until the correct LED pattern is achieved.
6. If you're testing a Model 330 computer, skip to Step 12. For a Model 350, power down
and unplug the computer. Install a the system bus between the processor board and a
memory controller board.
7. Turn on the computer. Watch the self-test display on the monitor.
8. The display should be correct and reflect the total memory in the computer,
Troubleshooting
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