Fluke 9000A-8080 Instruction Manual page 43

NOTE
When troubleshooting a pod, perform looping tests of the most
simple type (such as reads and writes as opposed to ROM and
RAM tests) that show a fault symptom. A synchronized probe can
then be used to trace a fault once such a looping test has it isolated.
5-9. SELF TEST CODE 00
8080
If self test produces a troubleshooter display of
POD SELF-TEST
ZBO
FAIL
00, a UUT read operation has failed and one or more of the following problems
is indicated:
• UUT power sensing circuit failure
• Control line(s) cannot be driven
• Address line(s) cannot be driven
• Wrong data read
To further isolate the trouble, prodeed as follows:
1. Check operation of the UUT power sensing circuit by verifying +5, -5
and+ 12 volt UUT supplies at the ribbon cable connector and zero volts
on the Power Fail line. Check the Power Fail line at the PCB-to-PCB
connector, and if necessary, at the shielded cable connector.
2. Perform a read operation. Use address OFFO if using the self test
socket as the UUT. (The self test socket sends the. upper address byte to
the data lines. During self test, read operations at OFFO and FOOF take
place.) Use any address containing known data if using some other UUT.
a. If the troubleshooter indicates a control line error, examine the
entire troubleshooter display to determine the stuck control line(s).
While looping on the error, use the probe or a scope to locate the point
of control line failure.
b. If the troubleshooter indicates an address line error, note the
failed address line(s) indicated on the troubleshooter display. While
looping on the error, use the probe or a scope to locate the point of
address line failure.
c. If the data read, indicated on the troubleshooter display, is not OF
when using the self test socket, or is not identical to the known data of
the UUT used for this test, a data line or address line failure is
5-9