HP 5890 SERIES II Service Manual page 286

The message " PASSED SELF TEST"indicates INET, at least with respect
to the HP 5890A, is performing satisfactorily. If FAILED SELF-TEST is
displayed, a bad cable may be indicated; install a different INET cable and
repeat the test. If FAILED SELF-TEST is displayed again for a second
cable, electronic problems within the HP 5890A are indicated; see Section
19, " Electronic Troubleshooting,"for more information.
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The LOOPBACK TEST may be used to check for continuity in an
INET cable; an open cable causes test failure. Verify that the cable
is at fault (rather than the HP 5890A) by testing a second cable.
If an intermittent cable problem is suspected, the test may be re-
peated as necessary while flexing the cable (particularly at its
plugs). An ohmmeter should also be used to test for problems; it is a
reliable method for testing continuity.
SVC 10- 13
NOTE