Keysight Technologies X Series - Page 248

248 Keysight N9010A EXA Service Guide
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Low Band Switch Control Logic Verification (Option 507, 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.
If your EXA has Option 532 or 544 skip to “Disconnect RF Front End Troubleshooting
Board” on page 249.
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 532 or 544.