IBM 7940, Problem Determination And Service Manual

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Hard disk drive problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See Chapter 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 to determine which components
are customer replaceable units (CRU) and which components are field replaceable units (FRU).
v If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
Not all drives are recognized by
the hard disk drive diagnostic
test.
1. Reseat the hard disk drive signal cable at both ends; then, run the hard disk
drive diagnostic test again.
2. Remove the drive that is indicated by the diagnostic tests; then, run the hard
disk drive diagnostic test again. If the remaining drives are recognized, replace
the drive that you removed with a new one.
The server stops responding
during the hard disk drive
diagnostic test.
1. Reseat the hard disk drive signal cable at both ends; then, run the hard disk
drive diagnostic test again.
2. Remove the hard disk drive that was being tested when the server stopped
responding; then, run the diagnostic test again. If the hard disk drive diagnostic
test runs successfully, replace the drive that you removed with a new one.
A hard disk drive was not
detected while the operating
system was being started. Reseat all hard disk drive cables; then, run the hard disk drive diagnostic tests
again.
A hard disk drive that you are
installing does not fit correctly in
the cage. Make sure that the type of drive is correct for this server (see Chapter 3, “Parts
listing, Type 7940 and 7941 servers,” on page 19).
Intermittent problems
v Follow the suggested actions in the order in which they are listed in the Action column until the problem
is solved.
v
See Chapter 3, “Parts listing, Type 7940 and 7941 servers,” on page 19 to determine which components
are customer replaceable units (CRU) and which components are field replaceable units (FRU).
v
If an action step is preceded by “(Trained service technician only),” that step must be performed only by a
trained service technician.
Symptom Action
A problem occurs only
occasionally and is difficult to
diagnose.
1. Make sure that:
v All cables and cords are connected securely to the rear of the server and
attached devices.
v There is adequate cooling airflow. Reduced airflow due to a failed fan or an
internal or external obstruction can cause the server to overheat and shut
down.
2. Check the BMC log (see “Error logs” on page 76).
3. See “Solving undetermined problems” on page 121.
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IBM System x3455 Type 7940 and 7941: Problem Determination and Service Guide