Assembly Removal and Replacement, MS203xC 7-18 Replacing VNA PCB Assembly
MS20xxC MM PN: 10580-00307 Rev. D 7-39
Disconnecting GPS Antenna Cable:
2. If the GPS Receiver Module PCB (Option 31) is NOT installed, then skip ahead to Step 3. 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 (item 11 in
Figure 7-18) from the top connector panel.
b. Remove the nut and lock washer and then remove the SMA connector from the top connector
panel.
c. Replace the lock washer and nut onto the SMA connector for safe keeping.
d. Route the cable to the side, clearing the notch and the top Connector panel, so it is clear of the
VNA PCB Assembly.
e. Removing the GPS Antenna SMA connector also provides easier access to one of the VNA PCB
Assembly mounting screws.
Removing Cables:
3. Cut the cable tie (if used) that holds the Ext Trig Input (item 1 in Figure 7-18) and Ext Ref Input (item 2
in Figure 7-18) coaxial cables to the RF Out semi-rigid coaxial cable.
Identifying VNA PCB Assembly Mounting Screws:
4. Using Figure 7-19, identify the locations of the eight (8) Phillips-head mounting screws that hold the
VNA Assembly PCB in place. Figure 7-20 shows the 8 hexagonal standoffs on the Mother Board. The
8 VNA Assembly PCB screws attach to the 8 hexagonal standoffs in the Main PCB (Mother Board). The
general locations of the 8 hexagonal standoffs are also visible in Figure 7-4 on page 7-6 and Figure 7-6
on page 7-8.
Figure 7-19. VNA PCB Assembly Screw Locations – MS2036C Shown
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