4-40 Service Guide N5230-90024
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5230C
Checking the Receiver Group
Equipment Used for These Tests
Getting Ready to Test
Before checking the assemblies, you must open the analyzer.
CAUTION 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 rear panel connections.
3. Remove the covers from the analyzer. Refer to “Removing the Covers” on page 7-6.
4. With the covers off, plug in the analyzer and turn on the power.
5. For Port 1 measurements, set the network analyzer for an S
11
measurement with a CW frequency of 1
GHz.
For Port 2 measurements, set the network analyzer for an S
22
measurement with a CW frequency of 1
GHz.
Checking the A20 Mixer Brick Receiver Outputs
Perform this procedure if a problem appears to be in one of the receiver channels.
1. Refer to the block diagram at the end of this chapter and to “Bottom Assemblies, Option 220” on
page 6-16. Locate the flexible cables W21, W22, W23 and W24 at each receiver channel IF output, A, R1,
R2, and B respectively.
2. Disconnect the flexible cable at the suspect channel.
3. Connect the spectrum analyzer to the suspect channel connector.
4. The measured signal on the spectrum analyzer should be at 250 kHz.
• If the measured signal is present, replace the A5 SPAM board. Refer to “Removing and Replacing the
A5 through A10 Boards and the Plenum Bracket” on page 7-16.
5. If the measured signal is not present, replace the A20 mixer brick. Refer to “Removing and Replacing the
A20 Mixer Brick” on page 7-32.
Equipment Type
Model or
Part Number
Alternate Model or Part
Number
Spectrum analyzer 8565E
856xE
a
a. Must be capable of measuring signals at 8.333 MHz and 41.667 MHz.
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