Keysight FieldFox Handheld Analyzers Service Guide 153
Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
Replacing the RF Assembly Including the A4 RF Board
(N991xA, N992xA, N993xA)
1. Separate the front and rear cases. Refer to “Separating the Front and Rear
Cases” on page 115.
2. Remove all measurement group assemblies as one unit. Refer to
“Removing All Measurement Group Assemblies as One Unit” on page 136.
3. Refer to Figure 7-24. Remove cables W1 and W2.
4. Refer to Figure 7-32. Remove the twenty-six screws (2) attaching the RF
board shield to the RF board (1).
5. Refer to Figure 7-33. The RF board (2) and shield (2) can now be
separated from the measurement assembly (1) .
6. Refer to Figure 7-30. Re-connect the A4 RF board to the A5 System board.
7. Refer to Figure 7-34. Replace the RF board shield by replacing the
twenty-six shield screws. Torque these nineteen shield screws (plus the
two System board screws, #13 and #21) in the sequence shown by the
circled numbers (1 - 21). Repeat this torque sequence one additional time.
Torque to 12 in-lbs.
8. Refer to Figure 7-24. Make sure the RFI O-rings are in the correct position
on the RF connectors.
9. Perform the steps under “Final Assembly Procedure” on page 164.
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