HP 8560A, Service Manual

Page: 215 / 450

Using the TAM
When attached to the spectrum analyzer’s rear panel, the HP 85629B Test and Adjustment
Module (TAM) p rovides diagnostic functions for supporting the HP 8560A. Because the TAM
is connected directly to the analyzer’s internal data and address bus, it controls the analyzer’s
hardware directly through firmware control. It would be impossible to control the hardware to
the same extent either from the analyzer’s front panel or over the HP-IB.
n
Revision C (date code or later, of the HP 85629B TAM firmware supports the
HP 8560A Spectrum Analyzer.
The TAM measures voltages at key points in the circuitry and flags a failure whenever the
voltage falls outside the limits. The TAM locates the failure to a small functional area which
can be examined manually. Remember the following when using the TAM:
n Be sure the spectrum analyzer’s power is turned off when installing or removing the TAM.
l
Use the HELP (found in all menus) for useful information.
n
Pressing will return you to the TAM’s main menu.
n The TAM acts as the active controller on the HP-IB bus. No other active controller should
be connected to the bus.
Diagnostic Functions
The TAM provides the four diagnostic functions listed below. (Additional menu selections
support the TAM itself.) Refer to the indicated page for a description of each function.
Diagnostic
Page
1. Automatic Fault Isolation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6-12
2. Manual Probe Troubleshooting
(requires cover removal) . . . . . . . . . . . . . . . . . .
6-13
3. Cal Oscillator Troubleshooting Mode
(requires cover removal) . . . . . . . . . . . . .
6-14
6-10 General Troubleshooting