4-40 Service Guide N5242-90001
Troubleshooting PNA Series Microwave Network Analyzers
Measurement System Troubleshooting N5242A
— Channel B; W60
— Channel C; W61
— Channel D; W62
— Channel R; W63
2. Disconnect the appropriate flexible RF cable from the output channel to be tested on the
A20 IF multiplexer board.
3. Connect the spectrum analyzer to the open connector.
4. The measured signal on the spectrum analyzer should be at 7.61 MHz.
5. If the measured signal is present, replace the A12 SPAM board. Refer to “Removing and
Replacing the A4–A13 Boards” on page 7-14.
6. If the measured signal is not present replace the A20 IF multiplexer board. Refer to
“Removing and Replacing the A20 IF Multiplexer Board” on page 7-28.
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