IBM RS/6000 H50, Installation And Service Manual

Page: 123 / 327

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 modules, 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 module pair may be installed
in module slots 1 and 2 (not slots 1 and 3). A second memory module 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 module 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 dis-
played 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 3-44.
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 3-45, if the system does not stop at an E3xx code, skip to
step 4 on page 3-44.
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
Chapter 3. Error Code to FRU Index
3-43