IBM 720X (9552) User Manual
Memory errors can stop system operations, show error
messages on the screen, or hang the system. The
computer detects memory parity errors but does not
correct them.
messages on the screen, or hang the system. The
computer detects memory parity errors but does not
correct them.
Use the following procedure to isolate memory problems.
Notes:
a. Except Model 755CX, installing a non-parity
memory card causes memory errors. Before you
go to the next procedure, check whether or not
the memory card use parity or non-parity. If the
non-parity memory card is installed, disable the
parity check on the Easy-Setup configuration
screen.
go to the next procedure, check whether or not
the memory card use parity or non-parity. If the
non-parity memory card is installed, disable the
parity check on the Easy-Setup configuration
screen.
b. Make sure that the memory card is fully installed
into the connector. A loose connection can
cause an error.
cause an error.
1. Power-off the computer and remove the IC DRAM
card, or DIMM card from its slot (if installed).
2. Press and hold the F1 key; then power-on the
computer. Hold the F1 key down until the
Easy-Setup screen appears.
Easy-Setup screen appears.
3. Select Test and press enter.
4. Select Memory and press enter to run the memory
4. Select Memory and press enter to run the memory
test on base memory. If an error appears, replace
the memory card.
the memory card.
5. Power-off the computer and reinstall the IC DRAM
card or the DIMM card; then power-on the computer.
Verify the memory size; then test the memory. If an
error appears, replace the IC DRAM card or the
DIMM card.
Verify the memory size; then test the memory. If an
error appears, replace the IC DRAM card or the
DIMM card.
IC DRAM
Displayed Value
0 MB
7808 KB
2 MB
9856 KB
4 MB
11904 KB
8 MB
16000 KB
16 MB
24192 KB
DIMM
Displayed Value
0 MB
7808 KB
4 MB
11904 KB
8 MB
16000 KB
12 MB
20096 KB
16 MB
24192 KB
20 MB
28288 KB
24 MB
32384 KB
32 MB
40576 KB
394
IBM Mobile Systems HMM