Assembly Removal and Replacement, MS202xC 6-18 Replacing VNA PCB Assembly
MS20xxC MM PN: 10580-00307 Rev. D 6-31
Disconnecting GPS Antenna Cable:
3. If the GPS Receiver Module PCB (Option 31) is NOT installed, then skip ahead to Step 4. If the GPS
Receiver Module PCB is installed, then perform the following sub steps:
a. Use two 5/16 inch (≅ 8 mm) wrenches to disconnect the GPS Antenna SMA connector from the top
connector panel.
b. Remove the nut and lock washer and then remove the SMA connector from the top connector
panel.
c. Route the cable to the side, clearing the notch and the top connector panel, so it is clear of the VNA
PCB Assembly.
Removing Cables and Ext Trig Input BNC:
Three or four cables connect the VNA PCB Assembly to the Main PCB Assembly (Mother Board or MB). One
cable, from the VNA Module, is connected directly to the VNA PCB. The other cables are from connectors on
the top connector panel.
• Ext Ref Input connector to MB J2200
• VNA Module to MB J2201
• Ext Trig Input connector to MB J2202
• GPS Antenna connector (if installed) to GPS PCB on MB
Continue Replacing the VNA PCB Assembly:
4. Cut the cable tie (if used) that holds the Ext Trig Input and Ext Ref Input coaxial cables to the RF Out
semi-rigid coaxial cable.
5. Using the Tool T1451 socket, remove the BNC Connector Dress Nut from the Ext Trig Input connector.
Pull the Ext Trig Input connector from the top connector panel and position it out of the way.
Removing the Ext Trig Input connector provides access to a VNA PCB Assembly mounting screw.
Identifying VNA PCB Assembly Mounting Screws:
6. Using Figure 6-14, identify the locations of the eight (8) Phillips-head mounting screws that hold the
VNA Assembly PCB in place.
Note
Replacing the nut and lock washer on the SMA connector after removal keeps all related parts
conveniently located.
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