Keysight N9912A Service Manual page 119

Repair and Replacement Procedures
Removing and Replacing the Measurement Group Assemblies
Figure 7-20 Replacing the Type-N RF Connectors and RF Cables
Replacing the A6 SOM Board and Flexible RF Cables
1. Separate the front and rear cases. Refer to
2. Remove all measurement group assemblies as one unit. Refer to
3. To replace the A6 SOM board:
4. To replace the flexible RF cables:
Keysight N9912A Service Guide
Cases" on page 7-9.
"Removing All Measurement Group Assemblies as One Unit" on
page 7-29.
a. Remove the four screws (item 3) that secure the A6 SOM board.
Discard these screws; new ones are provided in the
Re-assembly Kit.
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
Kit and tighten them in the torque sequence indicated by the circled
➊➋➌➍
numbers (
a. To aid i n reinstallation, note the connector to which each cable end
is connected before disconnecting the cable. Refer to
page 5-3 for an electrical 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.
"Separating the Front and Rear
) in the illustration.
Repair and
Repair and Re-assembly
Figure 5-1 on
7-33