Fluke 9000A-8080 Instruction Manual page 44

8080
indicated. Determine the failed line(s) from the display and locate the
point of failure using the synchronized probe or a scope while
performing a looping read operation.
3. Repeat steps 2b and 2c at different addresses and for different data in
order to toggle each of the address and data lines.
4. Check for operation of the interval timer and timing circuits by
observing pin 25 (IRQ) of U2 for a low-going output each time a read
operation is executed. If the IRQ signal is present, check for a SYNC
signal at pin 10 of the shielded cable connector, and for a UUT ON signal
at the PCB-to-PCB connector. The absence of these signals allows the
pod to communicate with the troubleshooter, but prevents the latches
from detecting addresses, data, and control signals sent to the UUT (or
self test socket). Failure of these signals may also prevent data read from
the UUT from reaching the pod microprocessor.
5-10. SELF TEST CODE 01
If self test produces a troubleshooter display of POD SELF-TEST ZBO FAIL
01, one or more of the following failures is indicated:
• UUT power sensing circuit failure
• Control line(s) cannot be driven
• Address line(s) cannot be driven
• Data line(s) cannot be driven
To further isolate the trouble, proceed as follows:
5-10
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 write operation; use OFFO for the address and OF for the
data.
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 pro be 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