140 Keysight FieldFox Handheld Analyzers Service Guide
Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
7-
Replacing the Type-N RF Connectors and RF Cables
(N991xA, N992xA, N993xA)
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 RF top assembly. Refer to “Removing and replacing the RF
Top Panel Assembly” on page 138.
4. Refer to Figure 7-24. Disconnect the cable connector nut on cable W1 or
W2, depending on which connector or cable is being replaced. Do not
attempt to remove the cable, just release the connector nut.
5. Remove the two screws (2) from the type-N RF connector to be replaced.
6. Lift the type-N RF connector upwards and out of the RF bottom shield.
7. The RF input cable can now be replaced by disconnecting the other end of
the cable and removing it. When installing the new cable, do not tighten
either of the cable connector nuts until both of them have been installed
finger tight.
8. Remove the RFI O-ring.
9. Remove the old insulator and install a new one.
10.Position the new type-N RF connector in the RF bottom shield, making
sure that it aligns with the cable connector underneath. Loosely install the
cable connector nut.
11.Install a new RFI O-ring over the new type-N RF connector in the position
shown.
12.Loosely reinstall the two screws (2). Note the location for these two
screws in the illustration. To ensure proper alignment, install two
additional screws, finger tight, in the two empty holes in the type-N RF
connector, then tighten the two screws that secure the connector.
Remove the two alignment screws.
13.Tighten the cable connector nut(s) on cable W1 or W2.
14.Continue with step 5 of the Removing and replacing the RF Top Panel
Assembly procedure on page 138.
15.Perform the steps under “Final Assembly Procedure” on page 164.
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