IBM RS/6000 44P Series 270, Service Manual

Page: 58 / 346

It is acceptable to have two partially populated memory cards in the system. The first
memory card does not have to be fully populated before memory on the second
memory card can be installed and used.
Memory modules, on the other hand, must be installed in matched (size and speed)
pairs. Refer to “Memory Modules” on page 236 for labeling of the memory card and
instructions on removing and installing modules. A single memory module pair can be
installed in module slots J1 and J2 (not slots J1 and J3). A second memory module pair
could be installed in module slots J5 and J6 (slots J3 and J4 do not have to be
populated first). In addition, memory module slots J1 and J2 need not be populated
before another slot pair.
Step 1240-1
1. Ensure that the diagnostics and the operating system are shut down.
2. Turn off the power.
3. Remove and reinstall any installed memory card(s).
4. Turn on the power.
Does the system stop with a memory checkpoint displayed on the operator
panel?
NO Reseating the memory card has corrected the problem.
Go to
″
Map 0410: Repair Checkout
″
in the RS/6000 and
Eserver
pSeries
Diagnostics Information for Multiple Bus Systems .
YES If there is only one memory card installed, tag it as
″
suspect bad
″
and go to
“Step 1240-7” on page 42.
If there are two memory card installed, go to “Step 1240-2”.
Step 1240-2
1. Turn off the power.
2. Remove the memory card from slot J3.
3. Turn on the power.
Does the system stop with a memory checkpoint displayed on the operator
panel?
NO Go to “Step 1240-4” on page 41.
YES Go to “Step 1240-3” on page 41.
40
Service Guide