Keysight Technologies N9040B UXA Signal Analyzer Service Guide 461
Assembly Replacement Procedures
Motherboards
Replacement
1. Refer to Figure 15-107. Slide the front motherboard into the slot and use
the ejectors to mate with the rear motherboard connectors. Replace the
seven screws (1) (0515-0372) that attach the front motherboard bracket
to the chassis. Torque to 9 inch-pounds.
2. Refer to Figure 15-106. Place the front bracket (1 ) into position in the
chassis and replace the nine screws (2) (0515-0372). Torque to
9 inch-pounds.
3. Replace the Low Band switch assembly. Refer to the “A11 Low Band
Switch” replacement procedure.
4. Replace the Front End Assembly. Refer to the “A13 RF Front End
Assembly” replacement procedure.
5. Replace the Low Noise Path and Microwave Preselector Bypass Switches.
Refer to the “Low Noise Path and Microwave Preselector Bypass Switches”
replacement procedure.
6. Refer to Figure 15-105. Place the front brace (1) into position in the
chassis and replace the eleven screws (2) (0515-0372). Torque to
9 inch-pounds.
7. Replace the RF bracket. Refer to the RF Bracket removal steps on
page 456 or page 457. Torque screws to 9 inch-pounds.
8. Replace the fan bracket. Refer to the “Fan Assembly” replacement
procedure.
9. Replace all of the card cage assemblies. Refer to the “Card Cage Boards”
procedures.
10.Replace the front frame. Refer to the “Front Frame Assembly” replacement
procedure.
11.Replace the top brace and card cage brace. Refer to the “Top Brace and
Card Cage Brace” replacement procedure.
12.Replace the instrument outer case. Refer to the “Instrument Outer Case”
replacement procedure.
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