Keysight FieldFox Handheld Analyzers Service Guide 167
Repair and Replacement Procedures
Processor Upgrade Procedures
Processor Upgrade Procedures
N9910HU-100/200/300/400 Processor Upgrade Procedure
1. Separate the front and rear cases. See “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. Remove the I/O side panel. Refer to “Replacing the I/O Side Panel, Doors,
and Gasket” on page 120.
4. Disconnect cable W3 and W4 from the A5 System board.
5. 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.
6. Remove the System board shield by removing the nineteen screws (2).
Discard the screws, new ones are provided in the Repair and Re-assembly
Kit.
7. 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.
8. Unplug the A6 SOM board from the A5 System board.
9. Refer to Figure 7-29. Remove the two screws (1) from the A5 System
board, lift it up from the RF bottom shield, and unplug it from the A4 RF
board connector. Discard the screws, new ones are provided in the Repair
and Re-assembly Kit.
10.Refer to Figure 7-30. Plug in the new A5 System board to the A4 RF board,
over the new gasket, and aligned with the three dowel pins in the RF
bottom shield. Make sure the bullets are straight up when connecting the
System and RF boards.
11.Refer to Figure 7-28. Place the new CPU2 SOM board onto the System
board. 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.
12.Refer to Figure 7-31. Place the new System shield onto the System board
by aligning the dowel pins. Replace the nineteen shield screws. Torque
these 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.
13.Refer to Figure 7-40. For N9918A, N9928A and N9938A (opt. 100), replace
the 3.5mm connector with the new design 3.5mm connector with nut ring.
Refer to “Replacing the Type-N RF Connectors and RF Cables (N991xA,
N992xA, N993xA)” on page 140.
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