TROUBLESHOOTING EXAMPLE 6.4.
-
The procedure below shows a typical sequence of operations
you might use with the
91OOA/9105A
to isolate a fault on a
defective UUT. This procedure was taken from a real UUT, but
of course, you will have a different UUT and will probably even
have a different fault, so the results you see will almost certainly
be different.
However, this example will be helpful in
understanding what to expect when you run GFI to isolate faults
on your
UUTs.
Suppose you have a defective UUT and you wish to isolate the
fault. To do so, a known-bad point on the defective UUT must
be identified. The
91OOA/9105A
will use this as a starting point
to begin backtracing. For your convenience, the
91OOA/9105A
can be programmed for automatic selection of a known-bad
starting point if you have run an automated test first. Then when
you press the GFI key to begin fault isolation, the name of an
appropriate known-bad point on the defective UUT is already
entered into the command for you.
A typical GFI procedure is shown below:
1.
Check to be sure that the pod is connected to the
UUT.
2.
Check to be sure that any other connections required
for your UUT have been made.
3.
Test the UUT with an automated functional test that
fails.
4. Press the GFI key and use the left arrow key to move
the cursor to the left-most field.
5.
Press the RUN
softkey.
At this point the operator’s
display will look something like that below:
RUN GFI WT DEMO REF U3 PIN 1
6-8
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