426 Keysight NFA Series Noise Figure Analyzers Service Guide
Assembly Replacement Procedures
Front End Control Assembly
Replacement
1. Refer to Figure 15-26. Install the Front End Control assembly into slot 6 in
the chassis securing with the ejector.
2. Reattach the ribbon cables W16, W17, and W18 and the wire harness
W22 to the Front End Control assembly (1). If the instrument has the
Enhanced Front End Control Assembly, reattach the additional cables as
shown in.Figure 15-27.
3. Replace the instrument top brace. Refer to the “Top Brace” replacement
procedure.
4. Replace the instrument outer case. Refer to the “Instrument Outer Case”
replacement procedure.
W22 will not be present on the N8973B.
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