424 Keysight NFA Series Noise Figure Analyzers Service Guide
Assembly Replacement Procedures
Front End Control Assembly
Front End Control Assembly
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. Refer to Figure 15-26. Remove the ribbon cables W16, W17, and W18 and
the wire harness W22 from the Front End Control assembly (1).
4. The Front End Control assembly can now be unplugged from the
motherboard by leveraging up on the ejector and lifting the board up on
the other side.
W22 will not be present on the N8973B.
N8976B will have the Enhanced Front End Control Assembly which will
have additional cables as shown in Figure 15-27.
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