Keysight N9912A Service Guide 7-33
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 “Separating the Front and Rear
Cases” on page 7-9.
2. Remove all measurement group assemblies as one unit. Refer to
“Removing All Measurement Group Assemblies as One Unit” on
page 7-29.
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 Repair and
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 Repair and Re-assembly
Kit and tighten them in the torque sequence indicated by the circled
numbers (
➊➋➌➍) in the 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 Figure 5-1 on
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.
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