446 Keysight NFA Series Noise Figure Analyzers Service Guide
Assembly Replacement Procedures
Midplane Assembly
Replacement
1. Refer to Figure 15-43. Install the midplane assembly into the chassis and
attach to the midplane bracket using the six screws (2) removed earlier.
Torque to 9 inch-pounds.
2. Replace the power supply support bracket with the two screws. Torque to
9 inch-pounds.
3. Replace the power supply assembly. Refer to the “Power Supply
Assembly” replacement procedure.
4. Replace the CPU assembly. Refer to the “CPU Assembly” replacement
procedure.
5. Replace the reference assembly. Refer to the “Reference Assembly”
replacement procedure.
6. Replace the top brace and reference bracket. Refer to the “Top Brace”
replacement procedure.
7. Replace the rear panel. Refer to the “Rear Panel” replacement procedure.
8. Replace the instrument outer case. Refer to the “Instrument Outer Case”
replacement procedure.
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