Note
The HP 85629B Test and Adjustment Modules with firmware revision A
or B will not properly execute Automatic Fault Isolation on the HP 8560A
Spectrum Analyzer.
Note
HP 8560A Spectrum Analyzers with serial prefix 3207A and above have the
TAM firmware residing in the spectrum analyzer. The TAM will use this
firmware regardless of the firmware revision in the HP 85629B.
TAM Requirements
For the TAM to function properly, certain parts of the analyzer must be operating properly.
These include the CPU, parts of the program ROM and program RAM, the keyboard and
keyboard 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 Print Page softkey. Even if
the display is dead, Print Page is still active. Refer to Chapter 12 for instructions on using
the 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 26 “test
connectors” located throughout the HP 8560A.
Note
HP 85629B Test and Adjustment modules with firmware revisions A or B
cannot make valid measurements on test connector A14J16 on standard
HP 8560A Spectrum Analyzers, nor test connector A14J17 on HP 8560A
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 assembly’s design revision. A “revision voltage” (placed onto
one 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 TEST. You can then probe the
rest of the assembly’s connectors.
Note
If the revision of the PC board is newer than the TAM, a message will 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.
General Troubleshooting 6-11
To Next Page
Loading...
Need help?
General
