Keysight N9912A Service Manual page 118

Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
Replacing the Type-N RF Connectors and RF Cables
1. Separate the front and rear cases. See
Cases" on page
2. Remove all measurement group assemblies as one unit. Refer to
"Removing All Measurement Group Assemblies as One Unit" on
page
3. Remove the RF top assembly. Refer to
Assembly" on page
4. 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 (item 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 (item 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.Perform the steps under
7-32
7-9.
7-29.
7-31.
"Post-replacement Procedure" on page
"Separating the Front and Rear
"Replacing the RF Top Panel
Keysight N9912A Service Guide
7-43.