Keysight Technologies N9030B Service Manual page 212

Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Low Band Switch Control Logic Verification (Option 503, 508, 513, 526
only)
If your PXA has option 544 or 550, skip to
Troubleshooting Board" on page
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
6-9.
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.
The procedure above will not work on analyzers with frequency range
options 544, and 550.
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
212
212.
Test Board Vol tage
Test Point (VDC)
In1A
−9.90
In2A −9.90
In1B
+10.0
In2B
+10.0
Test Board Vol tage
Test Point (VDC)
In1A +10.0
In2A
−9.90
In1B −10.0
In2B
+10.0
N9030B PXA Signal Analyzer Service Guide
"Disconnect RF Front End
Table 6-10.
Table