IBM RS6000 Service Guide - Page 114

Memory Test Hang Problem General Memory Information: Memory Card cards can be installed in either slot (or both) on the System Board, there is no requirement that one be installed before the other. It is perfectly acceptable for there to be 2 partially populated Memory Cards, the first one does not have to be fully populated before memory on the 2nd Memory Card is usable. Memory Card memory DIMMs, on the other hand, must be installed in matched (size and speed) pairs. Refer to the "Removal and Replacement Procedures" for "Memory Modules" on page 6-26 for labeling of the Memory Card and instructions on module removal and installation (do not, however, replace the covers as directed while troubleshooting this problem). A single memory DIMM pair may be installed in module slots 1 and 2 (not slots 1 and 3). A second memory DIMM pair could be installed in module slots 5 and 6 (slots 3 and 4 do not have to be populated first). Along these same lines, there is no requirement that memory DIMM slots 1 and 2 be populated before another slot pair. Problem resolution steps: This section attempts to trouble shoot a problem during the memory testing where the system hangs before an error code can be displayed on the Operator Panel. 1. Power down the system 2. Remove and re-install any installed Memory Card(s), power the system up. If the system no longer stops at an E3xx code, re-seating the Memory Card(s) has corrected the problem. 3. Attempt to isolate the problem to a specific Memory Card. a. If there is only 1 Memory Card installed, tag the card as suspect bad and skip to step 4 on page 3-43. b. Remove one of the 2 Memory Cards, tag the card as suspect bad and Power the system up. If the system no longer stops at an E3xx code, skip to step 3d. c. Power down the system, remove the installed Memory Card and install the Memory Card removed in step 3b. Move the suspect bad tag from the installed Memory Card to the one just removed, and power the system up. If the system stops at an E3xx code, remove the suspect bad tag and skip to step 7 on page 3-44, if the system does not stop at an E3xx code, skip to step 4 on page 3-43. d. Power down the system, remove the installed Memory Card and install the Memory Card removed in step 3b (tagged as suspect bad). Power the system up. If the system stops at an E3xx code again, skip to step 4 on page 3-43. 3-42 Service Guide