Agilent Technologies FieldFox MW N9913A, Service Manual, Page: 126 / 156

7-32 N9927-90003
Repair and Replacement Procedures FieldFox Analyzer
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 7-10 .
2. Remove all measurement group assemblies as one unit. Refer to “Removing All Measurement Group
Assemblies as One Unit” on page 7-27 .
3. To replace the A6 SOM board:
a. Refer to Figure 7-22 . Remove the RTC board. Refer to “Replacing the Real Time Clock (RTC)
Battery Located on the A5 System Board Shield” on page 7-31 .
b. Remove the System board shield by removing the 19 screws (item 2). Discard the screws, new
ones are provided in the Repair and Re-assembly Kit .
c. Refer to Figure 7-23 . Remove the four screws (item 2) that secure the A6 SOM board (item 1) to
the A5 System board. Discard these screws; new ones are provided in the Repair and Re-assembly
Kit .
d. Unplug the A6 SOM board from the A5 System board.
e. Plug the new A6 SOM board into the A5 System board.
f. Install four new screws (item 2) from the Repair and Re-assembly Kit and tighten them in the
torque sequence indicated by the circled numbers (
➊➋➌➍
) in the illustration.
g. Replace the System board shield by replacing the 19 screws. Torque to 12 in-lbs.
h. Place the RTC board onto the System board shield and secure with the two screws. Torque to
9 in-lbs.
4. To remove the I/O panel, refer to “Replacing the I/O Side Panel, Doors, and Gasket” on page 7-14 .
5. Perform the steps under “Post-replacement Procedure” on page 7-44 .