212 N9030B PXA Signal Analyzer Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Low Band Switch Control Logic Verification (Option 503, 508, 513, 526
only)
Press Mode Preset on the analyzer. Press FREQ, 50 MHz, SPAN, 2 MHz on the
analyzer. Make sure the auto alignments are turned off by pressing System,
Alignments, Auto Align, Off. Connect the voltmeter positive lead to test point
listed in the table below and the negative lead to the instrument chassis. These
test points are located under the J2 connector. Verify the voltages in Table
6-9.
Press FREQ, 5 GHz on the analyzer. Verify the voltages in Table 6-10.
If the voltages are not correct, the most probable cause is the A15 Front End
Control board.
Disconnect RF Front End Troubleshooting Board
You do not need the RF front end troubleshooting board to test out the
remaining front end hardware components. At this point it is advisable to
shutdown the analyzer and disconnect the test board and cables. Be sure to
If your PXA has option 544 or 550, skip to “Disconnect RF Front End
Troubleshooting Board” on page 212.
Table 6-9
Test Board
Test Point
Voltage
(VDC)
In1A −9.90
In2A −9.90
In1B +10.0
In2B +10.0
Table 6-10
Test Board
Test Point
Voltage
(VDC)
In1A +10.0
In2A −9.90
In1B −10.0
In2B +10.0
The procedure above will not work on analyzers with frequency range
options 544, and 550.
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