7-21 Removing MS203xC Main PCB Assembly Assembly Removal and Replacement, MS203xC
7-56 PN: 10580-00307 Rev. D MS20xxC MM
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:
Figure 7-26 shows model MS2036C. All steps to remove and replace the VNA PCB Assembly are the same for
MS2036C, MS2037C and MS2038C instruments. In model MS2037C and MS2038C, the microwave module
replaces the 2 semi-rigid cables. Refer also to the microwave module, item 15 in Figure 7-7 on page 7-9.
4. Using Figure 7-26, identify the locations of the eight (8) Phillips-head mounting screws that hold the
VNA Assembly PCB in place. Figure 7-27 on page 7-58 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
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