Must I return my 89441A Vector Signal Analyzer (VSA) for repair if it displays an "RF LO Unlock" error?
If an "LO Unlock" type of error message occurs and persists, a failure has occurred in the RF section of the VSA. The RF section model number is 89431A for the 89441A VSA. There is nothing further that can be done from the front panel. The RF section should be returned to an Keysight Service Center for repair, but the IF section (89410A) is not required.
Relevant Service Notes may be found by typing the model number 89431A into the search field of the Test & Measurement Service Notes site.