A-Class System Service
A-Class Server Trouble Shooting
Chapter 3
69
Random Access Memory (RAM) Module Fault. This fault occurs when a RAM
failure prevents the system from completing selftest. Chassis codes provided by the HSC
Remote Management card are useful in troubleshooting this type of error. For example,
FLT 7xxx indicates a failure in the memory selftest.
NOTE SIMM is an acronym for Single Inline Memory Module. A SIMM has components on one
side of the card, only.DIMM is an acronym for Dual Inline Memory Module. A DIMM has
components on both sides of the card.The acronym SIMM will be used throughout this
section to refer to either SIMM or DIMM.
Electrostatic Discharge Precautions. The procedures in this section require opening the
server and exposing the system to electrostatic discharge. Always observe all electrostatic
precautions when working with components inside or out of the server. Failure to follow these
precautions may result in component damage or loss of system reliability.
• Use a grounding mat and an anti-static wrist strap.
• Wear the anti-static wrist strap to ensure that any accumulated electrostatic charge is
discharged from your body to ground.
Before You Do Anything...
• Power down the system.
• Unplug the server.
NOTE Cabinet-mounted servers must be removed from the cabinet before proceeding.
• Remove the top of the server by unscrewing the knurled captive screws on each side of 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.
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