Assembly Removal and Replacement, MS203xC 7-25 Installing Main PCB and Reassembling Instrument
MS20xxC MM PN: 10580-00307 Rev. D 7-69
Installing GPS Receiver Module:
7. If the GPS Receiver Module (Option 31) is not installed, then skip ahead to Step 8. If it is equipped, then
perform the following sub steps:
a. Carefully position the replacement GPS Receiver Module so that it is lined up with its mounting
standoff holes and 14-pin header connector on the Main PCB.
b. Use extreme care so as to not bend any of the header pins.
c. Be careful to not offset the header pins by one row.
d. Make sure that the header pins are loosely but correctly positioned before proceeding.
e. When perfectly aligned, press on each side of the header strip to mate the connectors and the
header pins.
f. Insert and tighten the two (2) Phillips-head mounting screws. Note that these screws are shorter
than the screws that are used to hold the VNA PCB Assembly in place.
Torque these screws to 7.5 lbf·in (0.85 N·m).
g. Snap the GPS Antenna Cable MCX connector into place on the GPS Receiver Module. Position the
Antenna Cable off the right side of the Case. Do not yet install the GPS Antenna SMA connector in
the top connector panel.
Installing VNA PCB Assembly:
Figure 7-36 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.
If the VNA PCB Assembly is new, then refer first to Section “Preparing the Replacement VNA Assembly:”
on page 7-42 and then continue here. If the original VNA PCB Assembly is being replaced (with cables still
attached), or if you have completed performing the preparations in Section “Preparing the Replacement VNA
Assembly:” on page 7-42, then perform the following steps:
8. Place the VNA PCB Assembly upside down next to the Case and the Main PCB (Mother Board).
• Refer to Figure 7-35 on page 7-70 for an orientation photograph of the Mother Board connections
and mounting hardware.
• Refer to Figure 7-36 on page 7-71 for an orientation photograph of cable routing on the VNA PCB
when installed on top of the Mother Board.
9. If the GPS Receiver Module PCB (Option 31) is installed, then ensure that its antenna cable is out of the
way.
10. Position the replacement VNA PCB Assembly above the top case and above the Mother Board with the
lower edge of the Mother Board and the connectors exposed. Then attach 2 RF cables:
• Attach the cable from the MCX Connector (J7002) in the top shield of the VNA PCB Assembly
(item 4 in Figure 7-36) to MCX Connector J2201 on the Mother Board (item 7 in Figure 7-35).
• Route the cable from the Ext Trig Input connector through the notch to the Main PCB and attach
it to Mother Board MMXC connector J3202 Trig In (item 6
in Figure 7-35).
Installing the GPS Module, Option 31:
If the GPS Receiver Module PCB (Option 31) is not installed, then skip ahead to Step 11. If the GPS Receiver
Module PCB is installed, then perform the following sub steps:
a. Route the GPS Antenna Cable (with its SMA connector from the Main PCB) through the notch
between the top connector panel and the PCB, and into its position in the top connector panel.
b. Install the lock washer and then the nut.
c. Use two 5/16 inch (~8 mm) wrenches to attach the GPS Antenna SMA connector to the top
connector panel. Torque the nut to 7.5 lbf·in (0.85 N·m).
11. Carefully position the VNA PCB Assembly over the Main PCB and the eight (8) hex standoffs.
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