Keysight N5227B, Service Manual

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4-38 Keysight N5227B Service Guide
Troubleshooting
Measurement System Troubleshooting
4-
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 “Checking the A25 HMA26.5
Output,” is present, replace the A26 splitter. Refer to “Removing and
Replacing the A26 Splitter” on page 7-37 .
7. If the signal is present, reconnect cables W53 and W54, and then continue
with “Checking the Receiver Group” on page 4-46 .
Checking the A4 and A17 Source Synthesizer Outputs
1. Refer to the block diagram at the end of this chapter and to “Top Cables,
All Cables—All Options” on page 6-20 . Locate either the cable 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.
5. Refer to the Note on page 4-29 . 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 50 MHz reference signal from “Checking
the A14 50 MHz Reference Outputs” is present, replace the faulty
synthesizer board. Refer to “Removing and Replacing the A4–A17 Boards”
on page 7-17 .
7. If the signal is present, reconnect cables W1 and W2, and then continue
with “Checking the A5 and A10 Source Outputs” .
Checking the A5 and A10 Source Outputs
1. Refer to the block diagram at the end of this chapter and to “Top Cables,
All Cables—All Options” on page 6-20 . Locate the cables W3 and W4 at
the A5 source 1 board or cables W7 and W8 at the A10 source 2 board.
(W7, W8, and A10 are only available in 4-port models and 2-port models
with Option 224.)
2. Disconnect cables W3 and W4 or cables W7 and W8, dependent on which
source board is to be checked, at the A7, A8, A12, or A13 40 GHz Doubler
board.