Keysight Technologies N9040B UXA Signal Analyzer Service Guide                                                                    409
Assembly Replacement Procedures
RF Area - Options 544, 550
Replacement 
1. Refer to Figure 15-58. Place the Front End assembly into the chassis. From 
the bottom of the instrument, replace the six screws (2) (0515-0372) that 
attach the Front End assembly (1) to the chassis. Torque to 
9 inch-pounds in the order shown (#1 to #6).
Figure 15-58  Front End Assembly Bottom Screws - Replacement
Make sure ribbon cable W22 is under the 4 guide tabs on the back of the Front End assembly.