DEC DECstation 5000 Model 100 Series, Maintenance Manual

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Troubleshooting the Memory Modules
If a self-test reports an error code that includes mem, the
problem is in a memory module or the system module. The
additional information statement in the error message lists the
slot number of the memory module that reported the problem.
Before replacing either module, make sure the memory modules
are firmly seated on the system module. If the problem persists,
use the RAM board test, described in the next section, to
determine whether the problem is in the memory module.
If the system reports that all memory modules are bad,
1.
Remove all the memory modules on the system module.
2.
In the system module, insert a memory module that you
know is good.
3.
Repeat the RAM board test. If the system reports that the
new memory module is bad, replace the system module and
chassis.
If the system reports that not all the memory modules failed,
replace only those individual modules that the RAM board test
indicates are bad.
RAM board test
The RAM board test checks the operation of individual memory
modules. This test can take several minutes for each memory
module tested.
To run a RAM board test on all memory modules, type
t 7/mem * and press Return. The system then tests each
memory module separately.
To run a RAM board test on a single module, type
t 7/mem board and press Return. When you type this
command, replace board with the slot number of the memory
module you want to test.
Basic Hardware 5–11