Test Connectors; Inconsistent Results - HP 8560E Service Manual

interface, and the display.
Even though the TAM communicates to the operator via the display,
some display problems can be troubleshot using the TAM. This is
possible by using the
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TAM when the display is not functioning.

Test Connectors

The TAM uses a built-in dc voltmeter and DAC to measure voltages on
any one of the "test connectors" located throughout the HP 8560E/EC.
HP 85629B test and adjustment modules with firmware revisions A or
NOTE
B cannot make valid measurements on test connector A14J16 on
standard HP 8560E/EC spectrum analyzers, nor test connector A14J17
on HP 8560E/EC Option 002 spectrum analyzers.
Revision Connectors
One test connector on each assembly is reserved as a "revision
connector." The TAM uses the revision connector to identify the design
revision of the assembly. A "revision voltage" (placed onto one measured
signal line, MSL, pin) indicates design changes.
The TAM must be plugged into the revision connector first to determine
which tests to use for the assembly. If the revision connector has not
been probed, a message will appear instructing you to connect the probe
to the revision connector and press
the assembly connectors.
If the revision of the PC board is newer than the TAM, a message will
NOTE
be displayed stating that the revision code for this board is not known
by this module. The choices presented are to use the test for the latest
known revision board, measure only voltages, or exit. In general, most
points will not change from one board revision to another, so using the
most current tests is still very useful. However, any failure should be
verified using the manual troubleshooting procedures before doing a
repair.

Inconsistent Results

Many of the signals measured by the TAM are digitally controlled. If
inconsistent results are obtained, or if failures appear in unrelated
areas, the digital control may be at fault. Refer to the manual
troubleshooting procedures for those assemblies to isolate those
failures.
Chapter 6
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is still active. Refer to Chapter 12 for instructions on using the
softkey. Even if the display is dead,
. You can then probe the rest of
TEST
General Troubleshooting
Using the TAM
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