Fluke 9000A-Z80QT Instruction Manual page 64

Z8OQT
When troubleshooting
simple type (such as reads
RAM
tests) to
used
then be
5-9.
SELF TEST CODE 0
If a self test produces a failure code of
one or more of the following problems
UUT power sensing circuit failure
Control
line(s)
Address line(s)
data
Wrong
further
isolate the trouble, proceed
To
Check
1.
UUT supply at the
+5V
line. Check the Power Fail line at the
necessary, at the shielded cable
Perform
2.
socket as the UUT. (The self test socket sends the upper address byte to
data
the lines.
place.) Use any address
If the mainframe indicates a
a.
mainframe
looping
control
If the
b.
address line(s) indicated on the
the
error,
failure.
If the
c.
when using the
the UUT used for this test, a
indicated. Determine the failed line(s) from the display and locate the
point
performing a looping read
3. Repeat
order
to toggle each of the address and
a
reveal
afault
fault
to trace a
cannot be driven
cannot be driven
read
of the UUT power sensing circuit by verifying the
operation
ribbon
read operation. Use address
a
self test, read operations at
During
containing known data
display to determine the stuck control line(s). While
on the
error,
line failure.
mainframe
use the
probe
data
read, indicated on the mainframe display,
selftest
of failure using the synchronized probe or a scope while
steps 2b and
20
NOTE
pod, perform looping tests
and
writes as Opposed to
A
symptom.
once such a looping test
a UUT read
0,
indicated:
is
follows:
as
connector
cable
PCB-to—PCB
connector.
control
use the probe
or
indicates an address line
mainframe
to
or a scope
not
socket, or is
data
operation.
different
addresses and for different
at
data
of
the most
ROM and
synchronizedprobe
has
it isolated.
operation
and on the Power Fail
0V
connector, and
if using the self test
OFFO
OFFO
if using some
error, examine the entire
line
scope to locate the
a
error,
display. While looping on
locate the point of address line
identical to the known
line or address line failure
lines.
can
has failed, and
if
and take
FOOF
other
UUT.
of
point
note the failed
not 0F
is
data
of
is
data
in