Keysight FieldFox Handheld Analyzers Service Guide 145
Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
Replacing the A6 SOM Board
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. To replace the A6 SOM board:
a. Refer to Figure 7-27. Remove the RTC board. Refer to “Replacing
the Real Time Clock (RTC) Battery Located on the A5 System Board
Shield” on page 144.
b. For N995xA and N996xA models, it is necessary to remove the top
panel assembly. Refer to “Removing and replacing the RF Top Panel
Assembly” on page 138.
c. Remove the System board shield by removing the 19 screws (2).
Discard the screws, new ones are provided in the Repair and
Re-assembly Kit.
d. Refer to Figure 7-28. Remove the four screws (2) that secure the A6
SOM board (1) to the A5 System board. Discard these screws; new
ones are provided in the Repair and Re-assembly Kit.
e. Unplug the A6 SOM board from the A5 System board.
f. Plug the new A6 SOM board into the A5 System board.
g. Install four new screws (2 ) from the Repair and Re-assembly Kit
and tighten them in the torque sequence indicated by the circled
numbers (1 - 2 - 3 - 4) in the illustration.
h. Replace the System board shield. Refer to Figure 7-31. Place the
System shield onto the System board by aligning the dowel pins.
Replace the nineteen shield screws. Torque these screws
(disregarding 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.
i. For N995xA and N996xA models, replace the top panel assembly.
Refer to “Removing and replacing the RF Top Panel Assembly” on
page 138.
j. Place the RTC board onto the System board shield and secure with
the two screws. Torque to 9 in-lbs.
4. Perform the steps under “Final Assembly Procedure” on page 164.
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