Agilent Technologies HP 8719D Service Manual page 220

If the Fault is Intermittent
Repeat Test Function
If the failure is intermittent, do the following:
repeat function.
Then press &ETIII# TE$T$.
4. Press
Chapter 10, "Service Key Menus and Error Messages."
HP-IB Failures
If you have performed "Step 3. Troubleshooting HP-IB Systems" in Chapter 4,
"Start Troubleshooting Here," and you suspect there is an HP-IB problem in the
analyzer, perform the following test. It checks the internal communication path
between the A7 CPU and the Al6 rear panel. It does not check the HP-IB paths
external to the instrument.
If the analyzer fails the test, the problem is likely to be the Al6 rear panel.
q
If the analyzer passes the test, it indicates that the A7 CPU can communicate
q
with the Al6 rear panel with a 50% confidence level. There is a good chance
that the Al6 rear panel is working. This is because internal bus lines have
been tested between the A7 CPU and A16, and HP-IB signal paths are not
checked external to the analyzer.
to stop the function. The test repeat function is explained in
to switch on the
REPEAT
.
Digital Control Troubleshooting