Agilent Technologies FieldFox N9923AN Service Manual page 107

RF Vector Network Analyzer
N9923AN
Replacing the A6 SOM Board and Flexible RF Cables
1. Separate the front and rear cases. Refer to
page 7-8.
2. Remove all measurement group assemblies as one unit. Refer to
Measurement Group Assemblies as One Unit" on page
3. To replace the A6 SOM board:
a. Remove the four screws (item 3) that secure the A6 SOM board. Discard these
screws; new ones are provided in the
b. Unplug the A6 SOM board from the A5 system board.
c. Plug the new A6 SOM board into the A5 system board.
d. Install four new screws (item 3) from the
them in the torque sequence indicated by the circled numbers (
illustration.
4. To replace the flexible RF cables:
a. To aid i n reinstallation, note the connector to which each cable end is connected
before disconnecting the cable. Refer to
diagram of each cable connection.
b. Cables W4 and W6 are provided as an assembly. When replacing this coax cable
assembly:
1. Make sure the cable connectors are positioned as shown and that the cable
assembly is routed as shown. Cable W6 is the one with a red mark on each
connector.
2. Ensure that there is no slack in the cables at the top connections as indicated.
3. Make sure that the cable assembly does not touch the TCXO chip on the A5
system board.
4. Clip cable W6 into each of the cable clamps on the A5 system board. Cable W6 is
the one with a red mark on each connector.
c. To replace cable W5 or W7:
1. Disconnect the appropriate cable and install the new cable being sure to position
it as shown.
5. To remove the I/O panel, refer to
page 7-12.
6. Perform the steps under
Service Guide N9923-90005
Removing and Replacing the Measurement Group Assemblies
"Separating the Front and Rear Cases" on
Repair and Re-assembly
Repair and Re-assembly Kit
Figure 5-1 on page 5-4
"Replacing the I/O Side Panel, Doors, and Gasket" on
"Post-replacement Procedure" on page
Repair and Replacement Procedures
"Removing All
7-25.
Kit.
and tighten
) in the
for an electrical
7-37.
7-29