Keysight Technologies N9020A Installation Note page 28

Installation Procedure
17.Refer to Figure 15. Place the RF Front End Assembly into the chassis. Replace the four screws
(2). Using the T-10 driver, torque to 9 inch-pounds in the sequence shown, starting with #1.
Figure 15 RF Front End Assembly Replacement
18.Reattach the cables W4 and W5 to the RF Front End Assembly (1). Torque the semi-rigid
cables to 10 inch-pounds. W3, W7, W15, and W20 should not be reattached; these cables will
be replaced with new cables later in the process.
W7 will not be present in instruments with Option 503.
28 Installation Note N9010-90054