N9030B PXA Signal Analyzer Service Guide 217
Front End Control Troubleshooting
A15 Front End Control Assembly Troubleshooting
Verifying Microwave Preselector Bypass Switch (Option MPB)
If the analyzer has frequency range option 508, 513, or 526, the switches which
perform the microwave preselector bypass are SW1 and SW2, which operate in
unison. If the frequency range option is 544 or 550, SW4 performs this
function.
SW1, SW2, and SW4 can be verified three different ways:
—“Click” Test
— Oscilloscope
— R.F. Signal Tracing
“Click” Test
This test changes between two different path modes. When this is done a
distinct “click” noise from SW1 and SW2 or SW4 can be heard. In the case of
SW1 and SW2, since both switches switch at the same time, it is difficult to
decipher if one is switching and the other is not.
Press Mode, Preset on the analyzer. Press FREQ, 5 GHZ, SPAN, 1 MHz,
AMPTD, More 1 of 2, uW Path Ctrl. Standard Path is the default. Select uW
Preselector Bypass and you should hear a distinct “click” noise if the control
logic from the A15 Front End Control board is getting to the appropriate switch.
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