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3. Power-off the computer and remove the IC DRAM
card, or DIMM card from its slot (if installed).
4. Press and hold the F1 key; then power-on the
computer. Hold the F1 key down until Easy-Setup
screen appears.
5. Select Test and press enter.
6. Select Memory and press enter to run the memory
test on base memory. If an error appears, replace
the system board.
7. Power-off the computer and reinstall the IC DRAM
card; then power-on the computer. Verify the
memory size; then test the memory. If an error
appears, replace the IC DRAM card.
If memory problems occur intermittently, use the loop
option to repeat the test. When the test detects an error,
an error log is printed on the printer connected to the
parallel port. See “Error Log” on page 229 for more
information.
If a parity error is logged in CMOS, POST error code 118
appears when the power is turned on. To clear the log
and to test the memory, run the memory diagnostic. If no
error is detected by the test, the log is cleared, and error
code 118 will not appear the next time the POST is run. If
the 118 error code occurs repeatedly, determine and
replace the failing memory FRU. FRUs should not be
replaced because of a single, un-reproducible failure.
Single failures can occur from a variety of reasons that
have nothing to do with a hardware defect such as: cosmic
radiation, electrostatic discharge, or software errors. FRUs
replacement should only be considered when a recurring
problems exits. If this is suspected, clear the error log and
run the test again. Do not replace any FRUs if log errors
do not reappear.
System Programs in Flash Memory:
System setup
programs and diagnostic tests are stored in Flash memory.
Flash Memory Update:
A flash memory update is
required for the following conditions:
New versions of system programs.
New feature or options are added.
When Updating Flash Memory
Do not power-off the computer, disconnect the Vac
power, or remove the battery during the Flash update.
On certain systems, updating Flash memory can reset
all customer’s configuration settings to the default
values.
To update the Flash memory, perform the following steps:
1. Connect the AC Adapter and install the battery pack.
202 IBM Mobile Systems HMM