292 Chapter6
General Troubleshooting
Using the TAM
Using the TAM
When attached to the spectrum analyzer rear panel, the HP 85629B
test and adjustment module (TAM) provides diagnostic functions for
supporting the HP 8560E/EC. Because the TAM is connected directly to
the internal data and address buses of the spectrum analyzer, it
controls the spectrum analyzer hardware directly through firmware
control. It would be impossible to control the hardware to the same
extent either from the spectrum analyzer front panel or over the HP-IB.
Revision C (date code 890704), or later, of the HP 85629B TAM
firmware supports the HP 8560E/EC 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:
• Be sure the spectrum analyzer power is turned off when installing or
removing the TAM.
• Use the
LP softkey (found in all menus) for useful information.
• Pressing
MODULE will return you to the main menu of the TAM.
• 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 three diagnostic functions listed below.
(Additional menu selections support the TAM itself.) Refer to the
following for a description of each function.
Diagnostic
1. Automatic Fault Isolation
2. Manual Probe Troubleshooting (requires cover removal)
3. Cal Oscillator Troubleshooting Mode (requires cover removal)
NOTE The HP 85629B test and adjustment modules with firmware revision A
or B will not properly execute automatic fault isolation on the HP
8560E/EC spectrum analyzer.
TAM Requirements
For the TAM to function properly, certain parts of the spectrum
analyzer must be operating properly. These include the CPU, parts of
the program ROM and program RAM, the keyboard and keyboard
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