Assembly Removal and Replacement, MS203xC 7-18 Replacing VNA PCB Assembly
MS20xxC MM PN: 10580-00307 Rev. D 7-43
14. Attach the 4 RF coaxial cables as follows:
a. To Mother Board (Main PCB Assembly):
• Attach the cable from the top RF shield on the VNA Module (MCX connector J7002) to
Mother Board MCX connector J2201 26 MHz Out.
• Route the cable from the Ext Trig In BNC connector on the top connector panel through the
notch to the Main PCB. Attach the cable to Mother Board MMCX connector J3202 Trig In.
Refer to Figure 7-19 on page 7-39 for coaxial cable connections between the VNA PCB
Assembly and the Main PCB Assembly.
b. To SPA PCB:
• Route the cable from the Ext Ref In BNC connector on the top connector panel through the
notch to the Main PCB and continue routing past the fan to the SPA PCB. Attach the cable
to SPA PCB MMCX connector J6000 (Ext Ref).
• Route the cable from the Ref Out 10 MHz SMA connector on the top connector panel
through the notch to the Main PCB and continue routing past the fan to the SPA PCB.
Attach the cable to SPA PCB MMCX connector J6001 (10 MHz Out).
Replace the cable tie (part number 3-721-2) near the fan (if used) that holds the 4 RF cables that
connect the case front to the case back.
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 VNA 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 attach 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.
17. After the connectors and the standoffs are correctly aligned, fasten the VNA PCB Assembly into place
using eight (8) Phillips-head screws. Torque the screws to 7.5 lbf·in (0.85 N·m).
Replacing Case Rear Assembly:
18. Carefully fold the Case Bottom Assembly into place above the Case Top Assembly. Check the cables to
ensure that they remain safely routed.
19. Ensure that the SPA connector plate is properly engaged within the top connector panel. Insert and
tighten the four plate mounting screws. Torque these screws to 4.0 lbf·in (0.45 N·m).
Caution
All cables along the lower edge of the Mother Board and VNA PCB Assembly must be routed in such
a manner that they will not be pinched between, or protrude between, the case halves of the upper
battery compartment. If any cable protrudes into the battery compartment when the case is closed,
then the cable may be damaged by pinching, or by the battery when it is inserted, or it may prevent
battery insertion.
Caution
All cables along the lower edge of the Mother Board and VNA PCB Assembly must be routed in such
a manner that they will not be pinched between, or protrude between, the case halves of the upper
battery compartment. If any cable protrudes into the battery compartment when the case is closed,
then the cable may be damaged by pinching, or by the battery when it is inserted, or it may prevent
battery insertion.
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