6-19 Replacing GPS Receiver Module (Option 31) – ND70320 Assembly Removal and Replacement,
6-38 PN: 10580-00307 Rev. D MS20xxC MM
5. Using the Tool T1451 socket, remove the BNC Connector Dress Nut from the Ext Trig Input connector.
Pull the Ext Trig Input connector from the top connector panel and position so it is out of the way.
Removing the Ext Trig Input connector provides access to on the VNA PCB Assembly mounting screws.
6. Using a Phillips-head screwdriver, remove the eight (8) screws holding the VNA PCB Assembly in place.
Partially Removing the VNA PCB Assembly:
7. Gently lift the VNA PCB Assembly without disconnecting any cables and without applying excessive
stress to the cables. Carefully fold back the VNA PCB Assembly as if opening a book, and lay it
edge to edge with the Main PCB Assembly (Mother Board).
Disconnecting and Removing the GPS Antenna Cable:
8. Use needle-nose pliers to remove the MCX RF coaxial connector from the GPS Receiver Module.
9. Undo the two screws holding the GPS Receiver Module in place.
10. 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:
11. Remove the replacement GPS Module from its packing material and prepare it for installation.
12. Orient the replacement GPS Receiver Module so that it is lined up with its mounting holes and 14-pin
header connector. Observe the following:
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 the header pins are perfectly aligned, press on each side of the header strip to mate the two
connectors.
13. Insert and tighten the two Phillips 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 Assembly in place.
Installing the GPS Antenna Cable and SMA Connector:
14. 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.
15. “Fold” the VNA PCB Assembly back into position over the Main PCB and align it with the eight (8) hex
standoffs so that it is loosely positioned.
16. Route the GPS Antenna Cable with SMA connector in the slot between the top connector panel and the
PCB, until the cable is correctly positioned in the PCB notch cutout.
17. Install the SMA connector into the top connector panel, add the lock washer and the nut.
18. Use two 5/16 inch (≅ 8 mm) wrenches to tighten the GPS Antenna SMA connector to the top connector
panel. Torque the nut to 7.5lbf·in (0.85N·m).
Installing the VNA PCB Assembly:
19. Position the VNA PCB Assembly as accurately as possible over the Main PCB Assembly observing the
following:
• The fan and other cables on the side of the Case are clear of the hex standoffs and the Case edge.
• The GPS Antenna Cable is correctly routed between the top connector panel and the PCB and is
located in its notch.
• The coaxial cables between the two PCBs are on the OUTSIDE of the hex standoffs and also clear
of the Case edge.
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