AT&T System 25 - Manual (Page 238)

MAINTENANCE
Failure of the CPU/Memory CP at power-up generates the following type of
error message:
FAIL: : : :
The bracketed fields contain the following information:
●
is CPU/Memory
●
is one of the following:
RAM TEST
ROM TEST
AA INTERFACE
DUART TEST
REAL-TIME-CLOCK TEST
B U S E R R O R
WORK CYCLE
D P R T E S T
MMU TEST
AA RESET STUCK : SC?
●
specifies the specific location of the failure, such as the
address of a failed integrated circuit.
A representative Common Control failure message would be as follows:
FAIL: CPU: RAM TEST: IC26:
This message identifies the failure as a Random Access Memory (RAM) test
failure in integrated circuit 26 occurring on the CPU/Memory CP.
After partial failure, the system continues to operate and the green LED on
the CPU/Memory CP flashes normally.
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