Assembly Removal and Replacement, MS203xC 7-19 Replacing GPS Receiver Module (Option 31) –
MS20xxC MM PN: 10580-00307 Rev. D 7-47
Removing Coaxial Cables:
9. Using needle-nose pliers, remove the 2 attached coaxial cables from the Main PCB Assembly at the
following locations. Leave the cables attached to the VNA PCB Assembly.
• J2201 26 MHz Out – Cable connected to the top RF shield on the VNA Module.
(MCX connectors)
• J3202 Trig In – Cable connected to the Ext Trig In BNC connector on the top connector panel of
the VNA PCB Assembly and an MMCX connector on the Mother Board. Refer to Figure 7-19 on
page 7-39 for coaxial cable connections between the VNA PCB Assembly and the Main PCB
Assembly.
10. Carefully lift the VNA PCB Assembly and fold it over on top of the SPA PCB in the Case Bottom
Assembly. Arrange the VNA PCB Assembly so that the remaining cables are not stressed.
Disconnecting the GPS Antenna Cable:
11. Use needle-nose pliers to remove the MCX RF coaxial connector from the GPS Receiver Module.
Removing the GPS Receiver Module:
12. Undo the two screws holding the GPS Receiver Module in place.
13. Gently pull the GPS Receiver Module straight up to disconnect its 14-pin header connector. The header
pins should stay with the GPS Module.
Preparing and Installing the Replacement GPS Receiver Module:
14. Remove the replacement GPS Module from its packing material and prepare it for installation.
15. Position the replacement GPS Receiver Module so that it is lined up with its mounting holes and the
14-pin header connector and observe the following precautions:
a. Carefully position the GPB Receiver Module PCB over its mounting standoffs.
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 two connectors.
16. Insert and tighten the two Phillips-head mounting screws. Torque these screws to 7.5 lbf·in (0.85 N·m).
Note that these screws are shorter than the screws that are used to hold the VNA PCB Assembly in
place.
Installing the GPS Antenna Cable and SMA Connector:
17. 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.
Installing the VNA PCB Assembly:
18. Position the replacement VNA PCB Assembly above the top case and the Mother Board with the lower
edge of the Mother Board and the connectors exposed.
19. Attach the 2 RF coaxial cables to the Mother Board (Main PCB Assembly) as follows:
• 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 7-22 on page 7-46 for coaxial cable connections between the VNA PCB Assembly and the
Main PCB Assembly.
20. Replace the cable tie (part number 3-721-2) near the fan (if removed) that holds the 4 RF cables that
connect the case front to the case back.
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