Keysight N9038A, Service Manual, Page: 233 / 745

Keysight N9038A MXE Service Guide 233
RF Downconverter Section
RF Downconverter Section Troubleshooting
RF Downconverter Section Troubleshooting
There are three assemblies that are contained in what is considered the RF
Section of this instrument, and this section will describe how to verify the
performance of each of these. These assemblies are:
— A11 RF Switch / High Band Preamp
— A12 YTF Preselector
— A13 RF Front End Assembly
A11 RF Switch / High Band Preamp
There are two different A11 RF Switch / High Band Preamp assemblies used in
the N9038A - one for instruments with Option 503, 508, or 526 and one for
instruments with Option 544.
There are 4 different aspects of the A11 RF Switch / High Band Preamp
assembly functionality that can be verified with the procedures in this section.
They are:
1. Assembly Initialization
2. Low Band Signal Path
3. High Band Thru Signal Path
4. High Band Preamp Signal Path
Assembly Initialization
Before the A11 RF Switch / High Band Preamp assembly will function properly
it needs to initialize itself when the instrument is turned on and be recognized
by the instrument software. To verify that this has happened 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 A11 RF Switch / High Band
Preamp assembly should identify itself on this list as Low Band Switch . If this
assembly does not identify itself the cause for this will need to be determined
Refer to Chapter 15, “Block Diagrams.” .