Keysight Technologies N5244/5B Service Manual page 139

Troubleshooting
Measurement System Troubleshooting
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
All Cables—All Options, S/N Prefixes <6021" on page
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
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
the A14 50 MHz Reference Outputs"
synthesizer board. Refer to
(For analyzers with serial numbers prefixed MY/SG/US5150 and below)"
on page
7. If the signal is present, reconnect cables W1 and W2, and then continue
with
Checking the A5 and A10 Source Outputs
1. Refer to the block diagram at the end of this chapter and to
All Cables—All Options, S/N Prefixes <6021" on page
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.)
1. A4 and A17 synthesizer boards only applies to PNAs with serial number prefixes
Keysight N5244B/45B Service Guide
is present, replace the A26 splitter. Refer to
"Checking the Receiver Group" on page
the NOTE notice on page
7-20.
"Checking the A5 and A10 Source
<6021.
"Checking the A25 HMA26.5
7-46.
4-52.
4-31. If the observed problem was
is present, replace the faulty
"Removing and Replacing the A4–A17 Boards
Outputs".
"Removing and
1
"Top Cables,
6-24. Locate either
"Checking
"Top Cables,
6-24. Locate the
4-45