Keysight Technologies Option 503 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 543, 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 543, 544, and 550.
212
213.
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
N9030A PXA Signal Analyzer Service Guide
"Disconnect RF Front End
Table
Table 6-10.