HP 9000 A-180 User Manual page 77

the rear of the server. Slide the top back, lift it off, and set it aside.
General RAM Module Troubleshooting.
Step 1. List which size SIMMs are installed in which slots.
Step 2. Remove all RAM SIMMs except for slot 0a and 0b (0a/b). Plug in and power up the server,
and observe the front panel LEDs.
Step 3. If fault does not recur, the SIMMs installed in slot 0a and 0b are not the cause of the RAM
SIMM fault. Power down the server, refer to the memory configuration list (step 1) and install
the next pair of SIMMs. Power up the server and observe the front panel LEDs.
Step 4. Repeat step 3 until the RAM SIMM fault recurs. Note which pair of SIMMs caused the RAM
SIMM failure. Either replace both memory SIMMs or continue to troubleshoot to a single
SIMM.
For example: When RAM was reinstalled in slots 2a/b, the RAM SIMM fault returned.
Therefore, the problem is with one of the two RAM SIMMs installed in slot 2a/b.
Single RAM Module Troubleshooting. To troubleshoot RAM faults to a single SIMM, a
known-good RAM SIMM is required.
Step 1. Install the known-good RAM SIMM in slot A and install one of the original RAM SIMMs in
slot B. Power up the server and observe the front panel LEDs.
Step 2. If the fault does not recur, the problem was caused by the SIMM that is not presently
installed. Boot the system and resume normal operations. If the fault recurs, proceed to step 3.
Step 3. Power down the server and replace the RAM SIMM in slot B with the other original RAM
SIMM. Power up and observe front panel LEDs.
Step 4. If the fault does not recur, the problem is with the RAM SIMM that was previously installed
in slot B. Boot the system and resume normal operations.
Step 5. If the fault recurs, the problem is with the system board. To change the system board, you
must replace the A-Class Exchange Base Unit (EBU). Refer to the "Replacing an A-Class
Server Exchange Base Unit (EBU)" section.
I/O Subsystem or I/O Board Fault
This fault occurs when either an HSC or PCI I/O board prevents the system from
completing selftest. Chassis codes provided by the HSC Remote Management card
are useful to troubleshoot this type of error. For example: FLT 8xxx indicates an I/O
card failure.
To troubleshoot I/O Subsystem or I/O Board Faults using the front panel LEDs,
follow the procedure listed below:
Chapter 3
A-Class System Service
A-Class Server Trouble Shooting
77