Checking The Signal Separation Group - Keysight N5227A Series Service Manual

Troubleshooting
Measurement System Troubleshooting
2. Disconnect cable W27 or W28 or W29 or W30, depending on which
doubler board is to be checked.
3. Connect the spectrum analyzer to the open connector on the doubler
board to be checked.
4. Set the PNA for an 800 MHz CW output frequency and observe the
spectrum analyzer display. An 800 MHz signal should be present.
5. Refer to the Note on
troubleshooting is frequency banded rather than broadband related, set
the PNA output frequency to the center of the problem band. The
spectrum analyzer should display a signal above the PNA 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 signals described in
and A17 Source Synthesizer Outputs" on page 4-39
the appropriate doubler board. Refer to
A60–A63 70 GHz Doublers" on page
7. If the signal is present, reconnect all cables, and then continue with
"Checking the Signal through the Signal Separation Path" on page

Checking the Signal Separation Group

Before checking the signal separation group assemblies, you must open the
analyzer.
Use an antistatic work surface and wrist strap to reduce the chance of
electrostatic discharge for all of the procedures in this chapter.
1. Turn off the analyzer power.
2. Unplug the power to the analyzer and disconnect all front and rear panel
connections except installed jumpers.
3. Remove the outer cover from the analyzer. Refer to
on page
Procedures described in this document are performed with power
supplied to the product while protective covers are removed. Energy
available at many points may, if contacted, result in personal injury.
Keysight N5227A Service Guide
— W29 on the A62 doubler board
— W30 on the A63 doubler board
page
7-7.
4-28. If the PNA problem you are
"Removing and Replacing the
7-50.
"Checking the A4
are present, replace
4-43.
"Removing the Covers"
4-41