Keysight Technologies FieldFox N9913A Service Manual page 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
2. Remove all measurement group assemblies as one unit. Refer to
3. To replace the A6 SOM board:
4. Perform the steps under
Keysight FieldFox Handheld Analyzers Service Guide
Cases" on page 115.
"Removing All Measurement Group Assemblies as One Unit" on page
a. Refer to Figure
the Real Time Clock (RTC) Battery Located on the A5 System Board
Shield" on page
b. For N995xA and N996xA models, it is necessary to remove the top
panel assembly. Refer to
Assembly" on page
c. Remove the System board shield by removing the 19 screws (2).
Discard the screws, new ones are provided in the
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
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
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
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.
"Separating the Front and Rear
7-27. Remove the RTC board. Refer to
144.
"Removing and replacing the RF Top Panel
138.
Repair and Re-assembly
Repair and Re-assembly Kit
"Final Assembly Procedure" on page
136.
"Replacing
Repair and
Kit.
Figure 7-31. Place the
164.
145