Keysight Technologies N5224A Service Manual page 109

Troubleshooting
Measurement System Troubleshooting
6. If the signal is not present but the signal from
LO Synthesizer Output"
"Removing and Replacing the A25 HMA26.5" on page
7. If the signal is present, reconnect cable W52 or W80 and then:
— for 2-port models, continue checking with
— for 4-port models, continue checking with
Checking the A26 Splitter Output
1. Refer to the block diagram at the end of this chapter and to
Cables, Standard 4-Port Configuration, Option 400" on page
the semi-rigid cables W53 and W54, at the A26 splitter.
2. Disconnect W53 and W54, one at a time, from the A26 splitter.
3. Connect the spectrum analyzer to the open connector.
4. Refer to Note on
frequency and observe the spectrum analyzer measurement. For analyzers
with DSP version 4.0, an 807.61 MHz signal should be present. For
analyzers with DSP version 5.0, an 807.44 MHz signal should be present.
5. If the observed problem was frequency banded rather than broadband
related, set the analyzer frequency to the center of the problem band. The
spectrum analyzer should measure a signal above the network analyzer
setting. For analyzers with DSP version 4.0, the signal is 7.61 MHz above
the network analyzer setting. For analyzers with DSP version 5.0, the
signal is 7.44 MHz above the network analyzer setting.
6. If the signal is not present but the signal from
Output,"
Replacing the A26 Splitter" on page
7. If the signal is present, reconnect cables W53 and W54, and then continue
with
Checking the A4 and A17 Source Synthesizer Outputs
1. Refer to the block diagram at the end of this chapter and to
Assemblies and Cables, All Options" on page
W1 at the A4 source 1 synthesizer board or W2 at the A17 source 2
synthesizer board. (W2 and A17 are only available in 4-port models and
2-port models with Option 224.)
2. Disconnect W1 or W2 from J1207.
3. Connect the spectrum analyzer to J1207.
4. Set the network analyzer for an 800 MHz CW frequency and observe the
spectrum analyzer measurement. An 800 MHz signal should be present.
Keysight N5224A/25A Service Guide
is present, replace the A25 HMA 26.5. Refer to
Group" on page 4-43.
Splitter Output".
page 4-28. Set the network analyzer for an 800 MHz CW
is present, replace the A26 splitter. Refer to
"Checking the Receiver Group" on page
"Checking the A15 13.5 GHz
7-32.
"Checking the Receiver
"Checking the A26
"Checking the A25 HMA26.5
"Removing and
7-34.
4-43.
6-16. Locate either the cable
"Bottom RF
6-56. Locate
"Top
4-37