264 Keysight N9038A MXE Service Guide
L.O. Synthesizer
A14 L.O. Synthesizer Assembly Troubleshooting
A14 L.O. Synthesizer Assembly Troubleshooting
Since the A14 LO Synthesizer assembly has only one main function there are
only a few things that will need to be checked to verify that it is functioning
properly. They are:
1. Assembly Initialization
2. Assembly Status LEDs
3. Frequency and Amplitude of the 1st LO Output
Assembly Initialization
Before the A14 LO Synthesizer 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 A14 LO Synthesizer assembly
should identify itself on this list as LO Synthesizer. 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:
— FPGA Code on the assembly is corrupt
Solution: Reload the FPGA code. See FPGA Synchronization in
Chapter 19, “Post-Repair Procedures”.
— An instrument power supply voltage is not operating properly
Solution: Verify all instrument power supply voltages. See Chapter
12, “Power Supply & Midplane”.
— A14 LO Synthesizer assembly is defective
Solution: Replace the A14 LO Synthesizer assembly
Refer to
Chapter 15, “Block Diagrams”.
To Next Page
Loading...
