Keysight N8976B

Keysight NFA Series Noise Figure Analyzers Service Guide 403
Assembly Replacement Procedures
RF Area (N8973B, 74B, 75B)
Replacement
1. Refer to Figure 15-10. Place the switch onto the bracket and replace the
four screws (3). Torque to 9 inch-pounds in the sequence shown, starting
with #1.
2. Place the switch/bracket into place into the chassis and replace the two
screws. Torque to 9 inch-pounds starting with the screw closest to the
front of the instrument.
3. Refer to Figure 15-9. Replace the semi-rigid cables W3, W8, and W9.
Torque to 10 inch-pounds.
4. Replace the ribbon cable W18.
5. Refer to Figure 15-8. Position the chassis side, right onto the chassis and
replace the thirteen screws. Torque to 9 inch-pounds.
6. Replace the front panel. Refer to the “Front Frame Assembly” replacement
procedure.
7. Replace the top brace. Refer to the “Top Brace” replacement procedure.
8. Replace the instrument outer case. Refer to the “Instrument Outer Case”
replacement procedure.
W8 will not be present on the N8973B.