Data General NOVA 4/S Manual page 37

CPU (PFP) Fault
1.
2.
Replace the CPU board.
If the self-test still indicates a CPU (PFP) fault with
the the new CPU board, check the contents of the
accumulators as described in step 2, "Basic CPU
Fault," using both the new and original CPU boards.
If the contents of the accculumators are identical for
both boards; continue to step 3; otherwise, try
another CPU board, if you have one.
Remove the memory board which contains the first
16K physical memory addresses, and check the board
select jumpers (see "Memory Board Replacement,"
Chapter 14) for jumpering.
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If the correct board select jumpers are inserted,
replace the memory board.
If the self-test still indicates a CPU (PFP) fault with
the new memory board, check the contents of the
accumulators as described in step 2, "Basic CPU
Fault," using both the new and original memory
boards. If the contents of the accumulators are
identical for both boards, continue to step 6;
otherwise, try another memory board, if you have
In a 16-slot chassis if you have already done steps 1
through 5, see if the memory board will work in any
available memory slot. If it does, move the bus
terminators, if required.
If you have already done steps 1 through 6, replace
the bus terminators.