IBM 7940, Problem Determination And Service Manual

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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.
Beep code Description Action
1-3-1 First 64K RAM test failed.
1. Reseat the DIMMs.
2. Replace the lowest-numbered pair of
DIMMs with an identical known good pair of
DIMMs; then, restart the server. If the beep
code error remains, go to 3b. Return one
DIMM at a time from the failed pair to its
connector, restarting the server after each
DIMM, to identify the failed DIMM.
3. Replace the following components, one at a
time, in the order shown, restarting the
server each time:
a. DIMMs
b. (Trained service technician only) System
board
1-3-2 First 64K RAM parity test failed.
1. Reseat the DIMMs.
2. Replace the following components one at a
time, in the order shown, restarting the
server each time.
a. DIMMs
b. (Trained service technician only) System
board
2-1-1 Secondary DMA register failed. (Trained service technician only) Replace the
system board.
2-1-2 Primary DMA register failed. (Trained service technician only) Replace the
system board.
2-1-3 Primary interrupt mask register failed. (Trained service technician only) Replace the
system board.
2-1-4 Secondary interrupt mask register failed. (Trained service technician only) Replace the
system board.
2-2-1 Interrupt vector loading failed. (Trained service technician only) Replace the
system board.
2-2-2 Keyboard controller failed.
1. Reseat the keyboard.
2. Replace the following components one at a
time, in the order shown, restarting the
server each time.
a. Keyboard
b. (Trained service technician only) System
board
Chapter 5. Diagnostics
69