AM2020/AFP1010 Troubleshooting Guide 50432 Revision A 8/13/97
32
Each time the system is powered up or reset, the CPU performs a test of both
the static RAM and nonvolatile RAM chips. This involves alternately writing
zeros and ones to each memory location on these chips and reading the
information back. If any if the chips fail the test this trouble will be generated.
Corrective Action:
1) Remove power from the AM2020/AFP1010, batteries first and then AC. Wait
one minute. Reapply power - AC first, then batteries.
2) If the trouble does not clear, call Notifier Technical Support.
Each time the system is powered up or reset, the CPU performs a test of the
operating system EPROM on the CPU board by looking at the checksum. This
trouble is generated if the EPROM fails the checksum.
Corrective Action:
1) Remove power from the AM2020/AFP1010, batteries first and then AC.
Reapply power - AC first, then batteries.
2) Replace the EPROM on the CPU with one of the same software number or
one of a compatible set.
3) If the trouble persists, call Notifier Technical Support.
The CPU has sent a message to a LIB, SIB, or DIB but, because the checksum
does not match, the message in considered invalid.
Corrective Action:
1) Remove power from the AM2020/AFP1010, batteries first and then AC.
Reapply power - AC first, then batteries.
2) If the trouble does not clear, call Notifier Technical Support.
SCB stands for Serial Communication Bus. The CPU is trying to send an inquiry
to the DIB, SIB or to a specific LIB, but the response it is receiving is from a
different board. This could indicate that there is a problem with the ICA-4L,
Interconnect Chassis Assembly, since the ICA-4L handles the addressing of
each board.
Example: The CPU tries to send an inquiry to LIB #1. But, receives a response that it
identifies is from LIB #5.
Corrective Action:
1) Remove power from the AM2020/AFP1010, batteries first and then AC. Wait
one minute. Reapply power, AC first, then batteries.
2) If the problem does not clear, try replacing each ICA-4L one at a time.
3) If the problem still does not clear, call Notifier Technical Support.
The 8255 is an IC on the CPU board that is used for the input and output of data.
This trouble will occur if the CPU and the 8255 are not communicating properly.
Corrective Action:
1) Remove power from the AM2020/AFP1010, batteries first and then AC. Wait
one minute. Reapply power - AC first, then batteries.
T05 CPU External RAM
Test Error.
T06 CPU Code Memory
Checksum Error.
T07 CPU Message
Transmitted Error.
T08 SCB Assembly
Communications
Verified Failed.
T09 8255 Port Chip Con-
trol Word Check Fail.
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