420 Keysight NFA Series Noise Figure Analyzers Service Guide
Assembly Replacement Procedures
RF Front End Assembly (N8973B, 74B, 75B)
RF Front End Assembly (N8973B, 74B, 75B)
Removal
1. Remove the instrument outer case. Refer to the “Instrument Outer Case”
removal procedure.
2. Remove the instrument top brace. Refer to the “Top Brace” removal
procedure.
3. Remove the front panel. Refer to the “Front Frame Assembly” removal
procedure.
4. Refer to Figure 15-24. Using the 5/16 inch wrench, remove the cables W3,
W4, W5, W7, W15 or W36, and W20 attached to the RF Front End
Assembly (1).
5. Remove the ribbon cable W17 from the RF Front End Assembly.
6. Remove the four screws (2) using the T-10 driver. The RF Front End
Assembly can now be removed from the chassis.
W7 will not be present on the N8973B.
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