204 Keysight N9038A MXE Service Guide
RF Preselector Section
RF Preselector Section Troubleshooting
A24 Conducted Filter Assembly
The A24 Conducted Filter assembly is responsible for providing the RF
preselector filtering for frequencies below 30 MHz. Each of the filter paths, as
well as any through paths, will be verified in this section. However, before
verifying the operation of any of the filter paths the assembly initialization will
need to be verified.
Assembly Initialization
Before the A24 Conducted Filter assembly will function properly it needs to
initialize itself when the instrument is turned on and be recognized by the
instrument software. The first step in verifying that this has happened is to look
at the instrument Hardware Information screen. To view this information press
System, Show, Hardware. Once you do this you will see a listing of instrument
hardware assemblies that are installed. The A24 Conducted Filter assembly
should identify itself on this list as RF Presel Conducted Filter. If this assembly
does not identify itself the cause for this will need to be determined before any
other troubleshooting is performed. The most probable causes for this type of a
problem would be:
— An instrument power supply voltage is not operating properly
Solution: Verify all instrument power supply voltages. See Chapter
12, “Power Supply & Midplane”.
— A24 Conducted Filter assembly is defective
Solution: Replace the A24 Conducted Filter assembly
Refer to Chapter 15, “Block Diagrams.”.
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