6-25 Installing Main PCB and Reassembling Instrument Assembly Removal and Replacement, MS202xC
6-54 PN: 10580-00307 Rev. D MS20xxC MM
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 side of the Case. Do not yet install the GPS Antenna SMA connector in the
top connector panel.
Installing VNA PCB Assembly:
If the VNA PCB Assembly is new, then refer to Section “Preparing the Replacement VNA PCB Assembly:”
on page 6-34. If the original VNA PCB Assembly is being replaced, then perform the following steps:
7. Place the VNA PCB Assembly upside down next to the Case and the Main PCB.
Refer to Figure 6-14 on page 6-32, Figure 6-15 on page 6-33, and Figure 6-16 on page 6-34 for orientation
photographs of general placement and cable routing.
8. Using needle-nose pliers, connect the three coaxial cables between the Main PCB and the VNA PCB
Assembly:
• J2200 100 MHz In – Cable connected to the Ext Ref In BNC connector on the VNA PCB Assembly.
• J2201 26 MHz Out – Cable connected to the top RF shield on the VNA Module.
• J3202 Trig In – Cable connected to the Ext Trig In BNC connector on the VNA PCB Assembly.
Installing the VNA PCB Assembly:
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 VNA PCB Assembly above the top case and the Mother Board with the lower edge of the
Mother Board and the connectors exposed.
Refer to Figure 6-14 on page 6-32, Figure 6-15 on page 6-33, and Figure 6-16 on page 6-34 for orientation
photographs of general placement and cable routing.
11. Attach the cable from the MCX Connector in the top shield of the VNA Module to the J2201 MCX
Connector on the Mother Board. Refer to item 6 (cable) and item 9 (J2202) in Figure 6-16 on page 6-34.
12. Route the cable from the Ext Ref Input connector through the notch to the Main PCB and attach it to the
J2200 Ext Ref In MMXC connector. Refer to item 10 in Figure 6-16 on page 6-34.
13. Route the cable from the Ext Trig Input connector through the notch to the Main PCB and attach it to the
J3202 Trig In MMXC connector. Refer to item 8 in Figure 6-16 on page 6-34.
14. Gently move the VNA PCB Assembly over the Main PCB Assembly so that the connectors are engaged in
the top connector panel.
15. If the GPS Receiver Module PCB (Option 31) is not installed, then skip ahead to Step 16
. 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, and tighten.
c. Use two 5/16 inch (~8 mm) wrenches to connect the GPS Antenna SMA connector to the top
connector panel. Torque the nut to 7.5 lbf·in (0.85 N·m).
16. Carefully position the VNA PCB Assembly over the Main PCB and the eight (8) hex standoffs.
Note
Note the routing for each cable. On the Main PCB Assembly (refer to Figure 6-16 on page 6-34),
note that the MCX connectors for J2202 100 MHz Out (item_11)and J3203 140 MHz IF (item_7) are
not used in MS202xC instruments.
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