Troubleshooting Self Test 901 To 905 - Keysight N5171B EXG Service Manual

Troubleshooting
Running Self Test
5. Setup the spectrum analyzer:
6. The output signal frequency from J5000 should be 100 MHz at > 0 dBm.
7. If the measurement is within range, the A3 RF Assembly is likely good.

Troubleshooting Self Test 901 to 905

These self-tests validates the LO signal from the output of the synthesizer
section of the A3 RF Assembly. There is circuitry on the A3 RF Assembly that
cannot be isolated specifically to the A3 RF Assembly by self-tests, including
the associated vertical SMA connector (J2004) that is on the A3 RF assembly.
If this connector opens up or if there is a short, then a self-test failure 901 can
occur. A similar issue can occur and cause self-test failures 903 and 904 if
connector J2003 opens up or shorts. These same self-test failures can also be
caused by the corresponding vertical SMA connectors on the A2 Vector
Assembly should connectors P1 or P2 open or short. The connecting semi-rigid
cables W7 or W8 should also be eliminated as possible causes for these
self-test failures.
If these self-test(s) fail, perform the following:
1. Carefully remove W7 and W8 from both of their connectors.
2. Inspect and verify the cables are acceptable.
3. Verify connectors J2004 and J2003 are properly attached to the PCB by
4. Similarly verify that both connectors P1 and P2 on the A2 Vector Assembly
5. If the connectors are properly attached, go to step 6.
6. Connect the output from connector J2004 through a 10 dB attenuator
7. Setup the spectrum analyzer:
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a. Set the reference level to +30 dBm.
b. Set the CW frequency to 100 MHz.
c. Set the Span to 100 MHz.
REPLACE the A2 Vector Assembly.
a. If a cable is considered faulty, REPLACE the cable.
gently attempting to move both connectors.
a. If either connector is loose, REPLACE the A3 RF Assembly.
are properly attached.
a. If either connector is loose, REPLACE the A2 Vector Assembly
(PAD) to a spectrum analyzer.
a. Set the reference level to -30 dBm.
b. Set the CW frequency to 1GHz.
c. Set the Span to 100 MHz.
Keysight X-Series Signal Generators Service Guide